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Journal articles on the topic 'Interfacial Debonding'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 June 2024

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1

Yu, Xiao Ming, Bin Zhang, Jia Min Shen, Yue Li, and Sai Sai Liu. "Simulation and Analysis on Fiber Reinforced Rubber Matrix Sealing Composite Based on Cohesive Zone Model." Materials Science Forum 953 (May 2019): 65–71. http://dx.doi.org/10.4028/www.scientific.net/msf.953.65.

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A finite element model on the single fiber pull-out test of short fiber reinforced rubber matrix sealing composites (SFRC) were established. The effects of the interphase properties on the interfacial stress distribution and initial debonding strain are investigated based on the cohesive zone model (CZM). The influences of interphase thicknesses and elastic modulus on the interfacial debonding behavior of SFRC are obtained. The results show that the interfacial initial debonding strain increases with the increasement of interphase thickness, and it decreases with the increasement of interphase elastic modulus. An interphase thickness of 0.4 μm and an interphase elastic modulus of about 750 MPa are optimal to restrain the initiation of the interfacial debonding.
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2

Deng, Jiang Dong, Pei Yan Huang, Xin Yan Guo, and Jun Deng. "Analysis of Interfacial Debonding of RC Beams Strengthened with CFL." Advanced Materials Research 33-37 (March 2008): 47–54. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.47.

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The interfacial bonding property between carbon fiber laminate (CFL) and concrete is a key issue in the application of RC beams strengthened with CFL. In this paper, fracture mechanics method is used to develop a calculation formula of stress intensity factor for the CFL-concrete interfacial crack. In combination with a series of tests, the interfacial fracture toughness is discussed, and the influencing factors and process of the intermediate crack-induced debonding (IC debonding) are also analyzed. The tests results show that IC debonding is generally induced by the flexural or flexural-shear cracks in the bottom of RC beams around the mid-span, and develop along the interface towards the end of the beam. A method to determine IC debonding derived from theoretic analysis and the tests results demonstrates that the interfacial failure can be effectively avoided by limiting CFL strain in the range of the debonding strain.
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3

Chu, Jou-Mei, Benjamin Claus, Boon Him Lim, Daniel O’Brien, Tao Sun, Kamel Fezzaa, and Wayne Chen. "Rate effects on fiber–matrix interfacial transverse debonding behavior." Journal of Composite Materials 54, no. 4 (October 4, 2019): 501–17. http://dx.doi.org/10.1177/0021998319866904.

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The rate effect of fiber–matrix interfacial debonding behavior of SC-15 epoxy with S-2 glass and aramid fiber reinforcements was studied via in-situ visualization of the transverse debonding event. In this study, the debonding force history, debonding initiation, debonding crack velocity, and crack geometry were characterized using a quasi-static load frame and a modified tension Kolsky bar at loading velocities of 0.25 mm/s and 2.5 m/s. Cruciform-shaped specimens were used for interfacial transverse debonding between SC-15 epoxy matrix and two types of fiber reinforcements. The load history and high-speed images of the debonding event were simultaneously recorded. A major increase was observed for the average peak debonding force and a minor increase was observed for the average crack velocity with increasing loading velocity. The crack geometry of the cruciform specimens under both loading velocities was also tracked. Scanning electron microscopy of the recovered specimens revealed the debonding direction along the fiber–matrix interface through angled patterns on the failure surface.
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4

Chen, Yan Hua, Jian Yu Chu, and Qing Jie Zhu. "Effects of Coating on Interfacial Fatigue of Fiber-Reinforced Composites." Advanced Materials Research 97-101 (March 2010): 830–33. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.830.

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Coating is one of important parts in fiber-reinforced composite. Under cyclic loading, the effect of coating on interfacial fatigue is investigated based on double shear-lag model. Stresses of components are obtained. Relationship for analyzing interfacial debonding is established by the Paris Formula. Interfacial fatigue on fiber/coating and coating/matrix is simulated. It can be seen that interfacial debonding on different interfaces meet energy conservation law in general.
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5

Swaminathan, Shriram, N. J. Pagano, and Somnath Ghosh. "Analysis of Interfacial Debonding in Three-Dimensional Composite Microstructures." Journal of Engineering Materials and Technology 128, no. 1 (March 18, 2005): 96–106. http://dx.doi.org/10.1115/1.1925293.

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This paper is aimed at analyzing stresses and fiber-matrix interfacial debonding in three-dimensional composite microstructures. It incorporates a 3D cohesive zone interface model based element to simulate interfacial debonding in the commercial code ABAQUS. The validated element is used to examine the potential debonding response in the presence of fiber–fiber interactions. A two-fiber model with unidirectional fibers is constructed and the effect of relative fiber spacing and volume fraction on the stress distribution in the matrix is studied. In addition, the effect of fiber orientation and spacing on the nature of initiation and propagation of interfacial debonding is studied in a two-fiber model. These results are expected to be helpful in formulating future studies treating optimal fiber orientations and payoff in controlling fiber spacing and alignment.
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6

Kwon, Y. W., and M. Serttunc. "Static and Dynamic Buckling of a Fiber Embedded in a Matrix With Interface Debonding." Journal of Pressure Vessel Technology 115, no. 3 (August 1, 1993): 297–301. http://dx.doi.org/10.1115/1.2929531.

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Analyses were performed for static and dynamic buckling of a continuous fiber embedded in a matrix in order to determine effects of interfacial debonding on the critical buckling load and the domain of instability. A beam on elastic foundation model was used for the study. The study showed that a local interfacial debonding between a fiber and a surrounding matrix resulted in an increase of the wavelength of the buckling mode. An increase of the wavelength yielded a decrease of the static buckling load and lowered the dynamic instability domain. In general, the effect of a partial or complete interfacial debonding on the domain of dynamic instability was more significant than its effect on the static buckling load. For dynamic buckling of a fiber, a local debonding of size 10 to 20 percent of the fiber length had the most important influence on the domains of dynamic instability regardless of the location of debonding and the boundary conditions of the fiber. For static buckling, the location of a local debonding was critical to a free, simply supported fiber, but not to a fiber with both ends simply supported.
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7

Heidarhaei, Meghdad, M. Shariati, and HR Eipakchi. "Effect of interfacial debonding on stress transfer in graphene reinforced polymer nanocomposites." International Journal of Damage Mechanics 27, no. 7 (August 10, 2017): 1105–27. http://dx.doi.org/10.1177/1056789517724857.

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A shear-lag analysis hybrid cohesive zone model is employed to investigate the stress transfer from polymer matrix to the graphene by considering the interfacial damage and debonding phenomena in graphene reinforced polymer nanocomposites. The applied stress can produce three cases for interface treatment: entirely intact, damaged and debonded. By using analytical derived relations, the distribution of axial stress in the graphene and interfacial shear stress at the three-mentioned states is determined and the applied stress to the nanocomposite which leads to damage and debonding initiation at the interface is evaluated. In addition, a sensitivity analysis is performed and the effects of graphene length, interfacial shear strength and graphene volume fraction on the axial stress of graphene, damage and debonding threshold stress along the interface and interfacial shear stress are studied. The results show that after applying a stress called second critical stress, the stress transfer between graphene and matrix at the bulk of graphene length (about 75% of the interface) stops due to debonding of this zone.
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8

Yang, Yizhan, Jiankang Chen, and Zhuping Huang. "Damage evolution in fibrous composites caused by interfacial debonding." International Journal of Damage Mechanics 29, no. 1 (June 3, 2019): 67–85. http://dx.doi.org/10.1177/1056789519854488.

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Interfacial debonding between fibers and matrix is one of the dominant damage types in fibrous composites. This paper investigates weakening effect due to the interfacial debonding. For simplification, the fibers are assumed to be rigid since the modulii and strength of fibers are much greater than those of matrix, and the distribution of the radii of fibers is assumed to obey the logarithmic normal distribution. The matrix is assumed to be a viscoelastic material. The boundary of the composite is subjected to transverse loading condition, the direction of which is perpendicular to that of fibers. The interfacial debonding between fibers and matrix is analyzed by the energy criterion, and the evolution formula of nucleated porosity due to the debonding is derived by the statistical approach. A newly defined volume average method is proposed to establish the macroscopic constitutive relation of the composites. The effect of the material parameters of matrix, as well as the size of fibers on the critical stress for the interfacial debonding and damage evolution are discussed in detail. The results obtained in this paper indicate that the macroscopic strain rate, the dispersion degree of the fiber's radii, the adhesive energy at the interface, and loading condition play key roles in the overall mechanical properties of the composites.
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9

Yu, Qian-Qian, and Yu-Fei Wu. "Fatigue behaviour of cracked steel beams retrofitted with carbon fibre–reinforced polymer laminates." Advances in Structural Engineering 21, no. 8 (September 18, 2017): 1148–61. http://dx.doi.org/10.1177/1369433217729518.

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In recent years, externally bonded carbon fibre–reinforced polymer has been considered an innovative way to strengthen steel structures attributed to its high strength-to-weight ratio, excellent corrosion resistance and fatigue performance. This article presents an experimental and numerical study on the fatigue behaviour of defected steel beams strengthened with carbon fibre–reinforced polymer laminates, with a special focus on the effect of interfacial debonding. Analytical modelling and numerical simulation confirmed that the interfacial debonding had a pronounced effect on carbon fibre–reinforced polymer strain and stress intensity factor at the crack front. After introducing interfacial debonding from experimental findings into the numerical analysis, the fatigue life and crack propagation versus cycle numbers of the specimens compared well with the test results. Based on the current experimental program, specimens with Sikadur 30 were more prone to debonding failure; therefore, Araldite 420 is suggested for strengthening schemes.
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10

Wang, Xiao Zhao, and Xin Sheng Song. "Energy-Based Debonding Model for Steel-Concrete Composite Structures." Advanced Materials Research 97-101 (March 2010): 1705–8. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1705.

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This paper present a energy-based modelling approches for interfacial debonding between steel and concrete. Steel-concrete composite structural member is considered as a generalized elastic body with both the applied load and the interfacial shear stress acting as boundary stresses, and the debonding is modeled as crack propagation along the interface. The energy relationship is discussed in the process of debonding and an energy-based criterion for steel-concrete composite structure is proposed. Following, the debonding process is analyzed through energy-based criterion. The analysis is first performed for special case with constant shear stress along debonded interface, and then for the general case with shear stress softening in the debonded zone. A direct correspondence between energy-based and strength-based analysis can be established for arbitrary softening behavior along the interface. Specifically, through the proper definition of effective interfacial shear strength, the conventional strength-based approach can be employed to give the same results as the much more complicated energy-based analysis.
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11

TAZAWA, Ei-ichi, Yuji MIZO-U-E, and Takeo KOJIMA. "Interfacial debonding of ice-asphalt concrete." Doboku Gakkai Ronbunshu, no. 453 (1992): 125–34. http://dx.doi.org/10.2208/jscej.1992.453_125.

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12

Funari, Marco Francesco, Fabrizio Greco, and Paolo Lonetti. "Sandwich panels under interfacial debonding mechanisms." Composite Structures 203 (November 2018): 310–20. http://dx.doi.org/10.1016/j.compstruct.2018.06.113.

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13

Steif, Paul S., and Anna Dollar. "Models of Fiber-Matrix Interfacial Debonding." Journal of the American Ceramic Society 75, no. 6 (June 1992): 1694–96. http://dx.doi.org/10.1111/j.1151-2916.1992.tb04250.x.

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14

Odessa, Itay, Yeoshua Frostig, and Oded Rabinovitch. "Dynamic interfacial debonding in sandwich panels." Composites Part B: Engineering 185 (March 2020): 107733. http://dx.doi.org/10.1016/j.compositesb.2019.107733.

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15

Yuan, Yi Yun, Qi Jun Wu, Da Peng Yang, and You Dong Ye. "Monte Carlo Simulation on the Matrix Failure Considering the Interfacial Debonding Energy." Advanced Materials Research 549 (July 2012): 774–79. http://dx.doi.org/10.4028/www.scientific.net/amr.549.774.

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Considering the interfacial debonding energy at the fiber/matrix interface, an improved Monte Carlo simulation has been done on the matrix failure of the unidirectional ceramic matrix composites. Firstly, the debond length formula was given, then the stress/strain formula was also reviewed, and the matrix failure was simulated by the improved Monte Carlo model, the effect of the interfacial debonding stress on the matrix cracks evolution and the stress/strain curve was considered especially. Lastly, the result was compared to the experiment data. The result shows that the larger interfacial debonding energy at the fiber/matrix interface, the larger debond stress, the crack density increase more slowly, the mean crack density smaller, the final failure strength lower. The improved Monte Carlo simulation result is agreed well with the experiment data.
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16

Xiong, Xu Yu, and Hai Feng Xu. "Study on Debonding Failure Behavior of RC Beams Combination Strengthened with Carbon Fiber Reinforced Polymer and Steel Plates." Advanced Materials Research 243-249 (May 2011): 597–609. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.597.

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In order to investigate the debonding failure mechanism,the distributions of interfacial shear stress between cracks and the influence of preload of on the ultimate load and interfacial shear stress,one reference beam and five beams strengthened with CFRP and steel plate at different level of perload were tested and analyzed.The experimental result indicated that the perload level has less influence on the ultimate capacity.Moreover,when debonding failure of sheet-end interface of concrete beams strengthened with CFRP and steel plate is avoided,the debonding failure of reinforced beams at perload level will occur in the position of midspan.At last,on the basis of cross-sectional equilibrium and compatiable conditions,an analytical model of interfacial bond shear stress is obtained, meanwhile the analytic model favorably matched with the experimental results.
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17

Mirzaei, Amir Mohammad, Mauro Corrado, Alberto Sapora, and Pietro Cornetti. "Analytical Modeling of Debonding Mechanism for Long and Short Bond Lengths in Direct Shear Tests Accounting for Residual Strength." Materials 14, no. 21 (November 6, 2021): 6690. http://dx.doi.org/10.3390/ma14216690.

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Interfacial debonding in fiber-reinforced composites is a common problem, especially in external strengthening techniques. This investigation aims to determine the load during debonding, and discusses two practical design parameters for direct shear tests, which are commonly used to assess the mechanics of debonding. In this study, three different bond-slip cohesive laws and one finite fracture mechanics approach are considered to investigate debonding in direct shear tests by taking the effect of residual strength into account. For each model, load during debonding and its maximum value are given by closed-form expressions, which are then checked against experimental data reported in the literature. It is shown that using the interfacial mechanical properties extracted from one geometry, the debonding load of tests with different bond lengths and widths can be predicted without any fitting procedure. Moreover, effective bond length formulae are suggested for each model; one is the straightforward extension (accounting for residual strength) of a formula available in the Standards. The results illustrate the importance of considering residual strength in direct shear tests, even at debonding onset, with its effect being nonetheless higher for long bond lengths.
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18

Yan, Banfu, Qiqi Zou, You Dong, and Xudong Shao. "Application of PZT Technology and Clustering Algorithm for Debonding Detection of Steel-UHPC Composite Slabs." Sensors 18, no. 9 (September 5, 2018): 2953. http://dx.doi.org/10.3390/s18092953.

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A lightweight composite bridge deck system composed of steel orthotropic deck stiffened with thin Ultra-High Performance Concrete (UHPC) layer has been proposed to eliminate fatigue cracks in orthotropic steel decks. The debonding between steel deck and UHPC layer may be introduced during construction and operation phases, which could cause adverse consequences, such as crack-induced water invasion and distinct reduction of the shear resistance. The piezoelectric lead zirconate titanate (PZT)-based technologies are used to detect interfacial debonding defects between the steel deck and the UHPC layer. Both impedance analysis and wave propagation method are employed to extract debonding features of the steel-UHPC composite slab with debonding defect in different sizes and thicknesses. Experimental tests are performed on two steel-UHPC composite slabs and a conventional steel-concrete composite deck. Additionally, an improved Particle Swarm Optimization (PSO)-k-means clustering algorithm is adopted to obtain debonding patterns based on the feature data set. The laboratory tests demonstrate that the proposed approach provides an effective way to detect interfacial debonding of steel-UHPC composite deck.
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19

LI, SHANHU, and SOMNATH GHOSH. "DEBONDING IN COMPOSITE MICROSTRUCTURES WITH MORPHOLOGICAL VARIATIONS." International Journal of Computational Methods 01, no. 01 (June 2004): 121–49. http://dx.doi.org/10.1142/s0219876204000034.

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This paper describes the development of the Voronoi cell finite element model (VCFEM) with interfacial decohesion for simulating debonding induced microstructural damage in fiber reinforced composites. Normal and tangential cohesive zone models at the matrix-fiber interface are used to describe the onset and growth of damage along the inclusion-matrix interface. It is shown that the initiation and especially the propagation of debonding depends not only on the total cohesive energy, but also on the shape of the traction-displacement curve. The model is used to study the influence of various local morphological parameters on damage evolution by interfacial debonding. A special function of various geometric parameters is developed to predict the location of debonding in microstructures with varying morphology. Various numerical examples are solved to establish the effectiveness of the model.
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20

Odessa, Itay, Oded Rabinovitch, and Yeoshua Frostig. "High-order crack propagation in compressed sandwich panels." Journal of Sandwich Structures & Materials 21, no. 5 (January 20, 2019): 1726–50. http://dx.doi.org/10.1177/1099636218824873.

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The response and the debonding mechanisms in axially compressed sandwich panels with an interfacial delamination are investigated using a nonlinear model. The mathematical model combines the extended high-order sandwich panel theory with a cohesive interface modeling. It includes the first-order shear deformation kinematic assumptions for the face sheets and high-order small deformations kinematic assumptions that account for out-of-plane compressibility for the core. The interfaces bond the face sheets and the core by means of traction–displacement gap laws. These interfacial laws can describe a diversity of physical conditions. In particular, interfacial debonding nucleation and propagation are described using cohesive laws that introduce the interfacial nonlinearity into the model. Geometrical nonlinearity of the face sheets is introduced in order to capture the instability associated with the buckling of the delaminated face sheet. The cohesive interfaces and others parameters are calibrated to match experimental results taken from the literature for a sandwich specimen subjected to an end-shortening compression. The instabilities due to the in-plane compression, together with the existence of delaminated regions and their tendency to grow, prompt buckling of the delaminated face sheet as well as nucleation and propagation of the interfacial debonding. The theoretical quantification of this complex mechanism compares well with the experimental results in terms of the physical response, the nucleation and propagation of the interfacial crack, and the evolution of local/global geometrical instabilities. In addition, the analysis explores debonding mechanisms that are beyond the capabilities of the experimental technique. Finally, the sensitivity of the response and the associated geometrical and interfacial instabilities to the boundary conditions are investigated.
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21

Xie, Zhi Hong, Pei Yan Huang, Gen Quan Zhong, and Jun Deng. "Effects of Locations of Adhesive Hollows on Interfacial Stress." Key Engineering Materials 462-463 (January 2011): 172–76. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.172.

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Fiber Reinforced Polymer (FRP) has been effectively used for strengthening concrete beams. In this study, nonlinear finite element (FE) model of the beam strengthened with CFRP is established to analyze the debonding failure caused by the adhesive hollow defects. The constitutive relationship of the adhesive layer in the FE models is similar to Monti’s bi-linear mode. Three different locations of the hollows are considered in the FE models. The principal stresses in the concrete, the debonding stresses in the adhesive and the stress in CFRP are calculated. The results show that the effect of the locations of the hollow is marginal on the principal stresses in the concrete. When the hollow appears close to the interfacial end, the debonding stresses in the adhesive and the shear stress in the CFRP are significant, which easily causes the debonding failure.
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22

Deng, Jiangang, You Song, Zhenbo Lan, Zhuolin Xu, Yanming Chen, Bing Yang, and Huali Hao. "The surface modification effect on the interfacial properties of glass fiber-reinforced epoxy: A molecular dynamics study." Nanotechnology Reviews 11, no. 1 (January 1, 2022): 1143–57. http://dx.doi.org/10.1515/ntrev-2022-0068.

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Abstract In this work, the effect of common functional groups, namely hydroxyl, formyl, carboxyl, and amine groups on the interfacial behavior of surface-modified glass fiber-reinforced epoxy is investigated at molecular scale. The interfacial properties of the epoxy/silica coated with different functional group systems are quantified by performing pulling test using the steered molecular dynamics simulations. It is found that the system with hydroxyl groups has a relatively lower interfacial interaction, exhibiting an adhesive failure mode. When partial hydroxyl groups are replaced by carboxyl, amine, and formyl groups, respectively, the interfacial interactions are increased and these systems exhibit a cohesive failure mode where failure happens in the epoxy close to interface. A relatively higher force is required for the adhesive debonding, while more energy can be dissipated for the cohesive debonding. Because the increased interfacial interactions can prevent the mobility of polymer chains, and delay the propagation of micropores in the matrix, leading to the epoxy matrix with a high ability of energy absorption. Our work provides an insight into how functional groups affect the interface debonding behavior of glass fiber-reinforced epoxy, offering a guideline for control of the interfacial properties of such composites through surface modification techniques.
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23

Hunt, S., and L. A. Carlsson. "Debonding in Overmolded Integrated Circuit Packages." Journal of Electronic Packaging 115, no. 3 (September 1, 1993): 249–55. http://dx.doi.org/10.1115/1.2909325.

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Recently introduced overmolded pad array chip carrier (OMPAC) electronic packages sometimes suffer from debonding between the overmold material and the printed circuit board. In this study, bond strength is characterized by a combination of experimental and analytical methods. Test specimens representative for OMPAC structures were designed, manufactured, and tested to failure in tension and torsion. Finite element stress analysis of the specimens was performed in conjunction with a combined interfacial stress failure criterion to determine interfacial tensile and shear strengths from the measured failure loads.
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24

Liu, Yang, Ming Zhang, Xinfeng Yin, Zhou Huang, and Lei Wang. "Debonding Performance of CFRP-Strengthened Nanomaterial Concrete Beam Using Wavelet Packet Analysis." Journal of Sensors 2020 (April 25, 2020): 1–13. http://dx.doi.org/10.1155/2020/7526703.

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The carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) has been increasingly attracting a widespread attention because of the advantages of using the excellent properties of nanomaterials to improve structural properties. An active sensing approach based on a piezoceramic transducer is developed to detect the interfacial debonding performance of CFRP-SNCB. A CFRP-SNCB specimen was fabricated and subjected to periodic loading test to initiate the debonding damage. Three piezoceramic smart aggregates (SAs) and three piezoceramic smart nanomaterial aggregates (SNAs) are embedded in the specimen and used as an actuator and sensor. Experiments show that the nanomaterial concrete becomes a good conduit for wave propagation due to the nucleation and filling effect of nanomaterial. The stress wave signal caused by the embedded SNAs is more sensitive to the debonding performance between CFRP and concrete than SA. The attenuation of stress wave caused by the increase of the severity of debonding damage can be clearly observed from the signals received from SAs and SNAs in the frequency domain analysis. The debonding cracking of the tension end region is earlier than the bond end region, which proves the starting point of structural debonding damage. Furthermore, the debonding state can be evaluated by wavelet packet analysis. The research results demonstrate that the proposed method has potentials to detect the interfacial debonding performance of CFRP-SNCB.
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Xie, J. H., Pei Yan Huang, Jun Deng, and Yi Yang. "Study on Interfacial Shear Stress in RC Beams Strengthened with Prestressed FRP Laminates." Advanced Materials Research 33-37 (March 2008): 507–14. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.507.

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Reinforced concrete (RC) beams strengthened with prestressed fiber-reinforced polymer (FRP) laminates has been proved to be a rather effective strengthening technique in the field of bridge engineering. However, debonding failure usually occurs at the end of FRP in the strengthened beams on releasing the prestress due to the high interfacial shear stress. Analytical method to calculate the interfacial stress is developed in this paper. Through the establishment of mathematical model for the interfacial shear stress, the distribution of the interfacial shear stress and the longitudinal stress of FRP are presented explicitly in an analytical way. Moreover, the maximum prestress level is estimated to prevent debonding failure on releasing the prestress. Finally, experimental results of eight strengthened beams validate the analytical solution for the FRP longitudinal stress.
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26

Cong, Ding, Guo Liping, Ren Jinming, Wang Yongming, Li Xinyu, Gao Yuan, Liu Wanpeng, and Li Ruize. "A Modified Fiber Bridging Model for High Ductility Cementitious Composites Based on Debonding-Slipping Rupture Analysis." Advances in Materials Science and Engineering 2022 (May 24, 2022): 1–16. http://dx.doi.org/10.1155/2022/1461318.

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Modified micromechanical bridging model is established with consideration of the fiber rupture effect at debonding and slipping stages. The bridging model includes the debonding and slipping rupture of fibers and establishes the fiber/matrix interfacial parameters (friction τ 0 , chemical bonding force G d , slip-hardening coefficient β ). A different interfacial bonding can cause fiber rupture. The influence of the interfacial conditions on the fiber rupture risk was investigated. In the modified bridging model, the effective bridging stress, the debonding rupture stress, and the slipping rupture stress were clearly identified. Finally, single-fiber pullout tests with different embedded lengths were carried out to validate the bridging model. The relationship between the fiber bridging stress and the crack opening predicted by the bridging model was consistent with the experimental results. This modified micromechanical bridging model can be used to quantitatively calculate the actual fiber bridging capacity and to predict the ductility of the high ductility cementitious composites reinforced by different types of fibers.
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27

Chang, Xu, An Zhi Yan, and Chun An Tang. "Numerical Simulation of Mixed-Mode Crack Induced Failure of Steel Plate Strengthened Concrete Beam." Advanced Materials Research 152-153 (October 2010): 171–74. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.171.

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The paper presents a numerical investigation of mixed-mode crack induced failure of concrete beam strengthened with steel plate. Both the cracking of the concrete and concrete-steel interfacial debonding can be observed. There is a shear stress concentration at the pre-existing crack or debonding tips, which is the root cause of the debonding. The results indicate that debonding only initiates and propagates along the left interface to the steel plate because that the normal stress along the left interface is tensile which make considerable contribution to the debonding and the normal stress along the right interface is compressive.
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28

Guo, Xian Zhang, Juan Xia Zhang, Zheng Zhao Liang, and Ya Fang Zhang. "Numerical Simulation of Interfacial Debonding Crack in Particle Reinforced Composites." Materials Science Forum 704-705 (December 2011): 973–79. http://dx.doi.org/10.4028/www.scientific.net/msf.704-705.973.

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A numerical test code is used to study the matrix-inclusion interfacial debonding for particulate reinforced composites. In our numerical model, It is assumed to be a three-phase composite composed of matrix, particulate and the interfaces between them. The finite element program is employed as the basic stress analysis tool when the elastic damage mechanics is used to describe the constitutive law of meso-level element and the maximum tensile strain criterion and Mohr-Coulomb criterion are utilized as damage threshold. A single inclusion of gradually interfacial debonding and a complex structure with 20 inclusions of the interfacial damage were studied under plane stress conditions. Results of stress distribution and interface debonding type obtained by numerical method agree well with the MARK and ABAQUS. The influence of heterogeneity of the matrix materials on the resulting process and the stress distribution of the failure process are also studied in the paper. It is found that the numerical test code can help to understand the failure mechanism of the model and it is an effective way to investigate the interfacial damage of composite materials. Keywords: Numerical test, interface, particulate reinforced composite, crack
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Chen, Jian Kang, and Liu Hong Chang. "The Effect of the Property of Non-Linear Viscosity on the Interfacial Debonding of Particulate-Reinforced Polymers." Key Engineering Materials 324-325 (November 2006): 113–16. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.113.

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The debonding of a rigid particle embedded in an infinite non-linear viscoelastic material is investigated in this paper. Under sphere-symmetric deformation, a non-linear equilibrium equation expressed by velocity of a particle in the viscoelastic matrix material is derived. The strain rate is obtained by solving non-linear equation in terms of iterative method. According to the energy criterion, the critical instant of the interfacial debongding is calculated. Numerical results show that the influence of non-linear viscosity on the interfacial debonding is significant.
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30

Chen, Hongbing, Bin Xu, Jiang Wang, Lele Luan, Tianmin Zhou, Xin Nie, and Yi-Lung Mo. "Interfacial Debonding Detection for Rectangular CFST Using the MASW Method and Its Physical Mechanism Analysis at the Meso-Level." Sensors 19, no. 12 (June 20, 2019): 2778. http://dx.doi.org/10.3390/s19122778.

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In this study, the transient multichannel analysis of surface waves (MASW) is proposed to detect the existence, the location and the length of interface debonding defects in rectangular concrete-filled steel tubes (CFST). Mesoscale numerical analysis is performed to validate the feasibility of MASW-based interfacial debonding detection. Research findings indicate that the coaxial characteristics in the Rayleigh wave disperse at the starting point of the debonding area and gradually restores at the end of the defect. For healthy specimens, the surface wave mode in CFST is closer to the Rayleigh wave. However, it can be treated as a Lamb wave since the steel plate is boundary-free on both sides in the debonding area. The displacement curves are further investigated with forward analysis to obtain the dispersion curves. The mesoscale numerical simulation results indicate that the propagation characteristic of the surface wave is dominated by the debonding defect. The detectability of interfacial debonding detection for rectangular CFST using the MASW approach is numerically verified in this study. The proposed MASW-based nondestructive testing technique can achieve bond-slip detection by comparing the variation trend of the coaxial characteristics in the time-history output signals and the dispersion curves obtained from the forward analysis, for avoiding misjudgment of the experimental observations.
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31

Zhao, Y. H., and G. J. Weng. "The Effect of Debonding Angle on the Reduction of Effective Moduli of Particle and Fiber-Reinforced Composites." Journal of Applied Mechanics 69, no. 3 (May 1, 2002): 292–302. http://dx.doi.org/10.1115/1.1459068.

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In an effort to uncover the effect of interfacial partial debonding on the reduction of composite stiffness, a reduced moduli approach is proposed for the fictitious inclusions which are used to replace the original partially debonded inclusions. The fictitious inclusions are now perfectly bonded to the matrix and any micromechanical theory can be called upon to estimate the moduli of the composite. Using the volume of the inclusion directly beneath the interfacial cracks under the considered loading mode as a measure of damage, a set of anisotropic damage parameters is established in terms of the debonding angle, providing the reduced moduli for the fictitious inclusions. Specific considerations include debonding on the top and bottom of spheres and prolate inclusions, debonding on the lateral surface of spheres and oblate inclusions, and debonding on the top and bottom of circular fibers and elliptic cylinders. The reductions of the five transversely isotropic moduli for the partially debonded particle composites and the nine orthotropic moduli for the partially debonded fiber composites are examined as the debonding angle increases. The theory is also compared with some finite element results, and it suggests that the concept proposed to estimate the reduced moduli of the fictitious inclusions is a viable one.
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32

George, A. "Introducing Brittle-Ductile Transition and Interfacial Debonding." Solid State Phenomena 59-60 (January 1998): 251–72. http://dx.doi.org/10.4028/www.scientific.net/ssp.59-60.251.

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33

Lissenden, Cliff J., and Carl T. Herakovich. "Interfacial debonding in laminated titanium matrix composites." Mechanics of Materials 22, no. 4 (April 1996): 279–90. http://dx.doi.org/10.1016/0167-6636(95)00031-3.

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34

Kim, Jang-Kyo, C. Baillie, and Yiu-Wing Mai. "Interfacial debonding and fibre pull-out stresses." Journal of Materials Science 27, no. 12 (1992): 3143–54. http://dx.doi.org/10.1007/bf01116004.

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35

Zhou, Li-Min, Jang-Kyo Kim, and Yiu-Wing Mai. "Interfacial debonding and fibre pull-out stresses." Journal of Materials Science 27, no. 12 (1992): 3155–66. http://dx.doi.org/10.1007/bf01116005.

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36

Kim, Jang-Kyo, Sehvoom Lu, and Yiu-Wing Mai. "Interfacial debonding and fibre pull-out stresses." Journal of Materials Science 29, no. 2 (1994): 554–61. http://dx.doi.org/10.1007/bf01162521.

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37

Kim, Jang Kyo, Li Min Zhou, and Yiu Wing Mai. "Interfacial debonding and fibre pull-out stresses." Journal of Materials Science 28, no. 14 (February 15, 1993): 3923–30. http://dx.doi.org/10.1007/bf00353200.

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38

Zhou, Li-Min, Yiu-Wing Mai, and Caroline Baillie. "Interfacial debonding and fibre pull-out stresses." Journal of Materials Science 29, no. 21 (November 1994): 5541–50. http://dx.doi.org/10.1007/bf00349945.

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39

Liu, Yuan Yuan, Ran Guo, and Wen Hai Gai. "The Analysis of Interfacial Debonding Using Voronoi Cell Finite Element Method." Applied Mechanics and Materials 644-650 (September 2014): 4922–26. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4922.

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This paper bases on the principle of the stress hybrid element, using voronoi cell finite element method to analysis the interfacial debonding phenomenon of a particle reinforced composite materials, then it contrasts by the commercial finite element software MARC in the same conditions of numerical simulation. Research results show that: In the interfacial debonding, especially at the crack tip stress, Stress is the biggest. Particles and matrix interface delamination is the important cause of material damage, at the same time, it has a great impact on the service life of components.
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40

Suzuki, H., and Hideki Sekine. "Fracture Energy and Fracture Behavior of Short-Fiber-Reinforced SMC Composites." Key Engineering Materials 430 (March 2010): 31–40. http://dx.doi.org/10.4028/www.scientific.net/kem.430.31.

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A probabilistic fracture model is introduced to clarify the influence of the fiber bundle-matrix interfacial condition on the fracture energy and fracture behavior of short-fiber-reinforced SMC composites. In this paper, we focus on the study of the influences of two parameters of the interfacial condition, i.e., the debond stress and the constant which governs the frictional forces acting on the debonding interfaces between fiber bundles and matrix in a debonding process, and then the influences of these parameters on the fracture energy and load-displacement curve are elucidated.
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41

Zhang, Feng, and Lei Gao. "Finite Element Model for Analysis of the Spatial Interfacial Debonding of FRP from Concrete." Advanced Composites Letters 26, no. 3 (May 2017): 096369351702600. http://dx.doi.org/10.1177/096369351702600305.

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The debonding of the FRP plate from concrete and crack-propagation processes are complex and the current research studies regarding this debonding mechanism are insufficient and not comprehensive. This work proposes a plane stress model along with equal width and different width FRP to concrete models to simulate the debonding and crack-propagation processes are presented. The longitudinal and horizontal stress distributions were analysed and the FRP to concrete width effect and FRP thickness parameters were also studied by means of the proposed three-dimensional finite element model. The results show that the different width 3D model is optimal for analysing the spatial interfacial debonding of FRP from concrete. The concrete surface horizontal stress distribution along the length of the concrete substrate could judge the effective bond length. Both the normal stress and shear stress are mainly divided into the following two small central stress regions under the PRP plate: a high stress gradient region near the FRP plate edge and a stress-free region near the concrete edge. The debonding strength and the stiffness of the bonding interface increase with the width of the FRP plate and the FRP plate thickness. The stress range and magnitude are strongly dependent on the width of the FRP plate. Debonding begins at the FRP plate edge; the thicker FRP plate more easily exhibits debonding.
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42

Liu, Zhen Yu. "Experiment Study on Interfacial Normal Bond Strength of Concrete Filled Steel Tube." Advanced Materials Research 594-597 (November 2012): 947–54. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.947.

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To study the debonding of concrete filled steel tube (CFST), pulling and bending methods were used to test the normal bond strength. Based on the test result, debonding due to temperature change and shrinkage of core concrete in CFST was analyzed. The test and analysis result shows that the bending method is a better test method; the concrete strength has little influence on bond strength while the surface condition of steel has much influence on it. The bond strength of steel which is rust is greater than that of the steel with smooth surface. According to the analysis on the bending test result, the normal bond strength of 0.86MPa was got and the debonding of CFST arch was analyzed, the analysis result shows that debonding will easily happen under the action of temperature change and shrinkage of core concrete. The test methods and results can provide a reference for engineering applications.
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43

Guo, Dong, Wan-Yang Gao, Dilum Fernando, and Jian-Guo Dai. "Effect of temperature variation on the plate-end debonding of FRP-strengthened beams: A theoretical study." Advances in Structural Engineering 25, no. 2 (October 25, 2021): 290–305. http://dx.doi.org/10.1177/13694332211046342.

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Steel/concrete structures strengthened with externally bonded FRP plates may be subjected to significant temperature variations during their service time. Such temperature variation (i.e., thermal loading) may significantly influence the debonding mechanism in FRP-strengthened structures due to the thermal incompatibility between the FRP plate and the substrate as well as the temperature-induced bond degradation at the FRP-to-steel/concrete interface. However, limited information is available on the effect of temperature variation on the debonding failure in FRP-strengthened beams. This paper presents a new and closed-form solution to investigate the plate-end debonding failure of the FRP-strengthened beam subjected to combined thermal and mechanical (i.e., flexural) loading. A bilinear bond-slip model is used to describe the bond behavior of the FRP-to-substrate interface. The analytical solution is validated through comparisons with finite element analysis results regarding the distributions of the interfacial shear stresses, the interfacial slips and the axial stresses of the FRP plate. Given that a constant bond-slip relationship is adopted, it is observed that an increase in service temperature will lead to an increased interfacial slip at the plate end and consequently a reduced plate-end debonding load, and vice versa. Further parametric studies have indicated that the thermal loading effects become more significant when shorter and stiffer FRP plates are applied for strengthening.
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44

Fujii, Tomoyuki, Keiichiro Tohgo, Yu Itoh, Daisuke Kato, and Yoshinobu Shimamura. "Analysis of Crack-Tip Field of Particulate-Reinforced Composites Taking Account of Particle Size Effect and Debonding Damage." Key Engineering Materials 452-453 (November 2010): 625–28. http://dx.doi.org/10.4028/www.scientific.net/kem.452-453.625.

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This paper deals with an analysis of a crack-tip field of particulate-reinforced composites which can describe the evolution of debonding damage, matrix plasticity and particle size effect on deformation and damage. Numerical analyses were carried out on a crack-tip field in elastic-plastic matrix composites reinforced with elastic particles by using a finite element method developed based on an incremental damage theory. The particle size effect on damage is described by a critical energy criterion for particle-matrix interfacial debonding. The effect of debonding damage on a crack-tip field is discussed based on numerical results. The debonding damage initiates and progresses ahead of a crack-tip. The stress distribution shifts downward in the debonding damage area. It is concluded that a crack-tip field is strongly affected by debonding damage.
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45

Bakay, Ryan, Ezzeldin Yazeed Sayed-Ahmed, and Nigel Graham Shrive. "Interfacial debonding failure for reinforced concrete beams strengthened with carbon-fibre-reinforced polymer strips." Canadian Journal of Civil Engineering 36, no. 1 (January 2009): 103–21. http://dx.doi.org/10.1139/l08-096.

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Rehabilitation of structures using fibre-reinforced polymers (FRPs) has become a preferred strengthening technique. Crack-induced debonding failure has been repeatedly recorded when using fibre-reinforced polymer (FRP) laminates to strengthen reinforced concrete (RC) beams and (or) slabs in flexure. A testing programme has been performed to determine the effect of the concrete compressive strength and the amount of shear reinforcement on the interfacial debonding. The ultimate strain at failure in the bonded laminates (usage efficiency) and the strain compatibility between the laminates and the concrete sections have been investigated. The current design methods for reinforced concrete members strengthened with FRP do not explicitly consider the interfacial debonding failure; using the results of the experimental programme, the applicability and limitations of these design methods are identified. New design procedures are proposed and compared with the experimental programme results and the currently adopted procedures.
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46

Li, Gui Bing, Yu Gang Guo, and Xiao Yan Sun. "Investigation on Intermediate Crack Induced Debonding Failure of FRP Laminates in Flexurally FRP-Strengthened RC Beams." Advanced Materials Research 243-249 (May 2011): 641–44. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.641.

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Debonding failure is commonly observed in FRP-strengthened RC beams. It can be classified into two types: plate end debonding and intermediate crack induced debonding. Intermediate crack induced debonding is the main failure mode in FRP-strengthened RC beams.There is no specialized experiment study on this failure mode. To investigate intermediate crack induced debonding failure of FRP-strengthened reinforced concrete beams, 9 CFRP-strengthened reinforced concrete beams were tested. Based on the investigation of the strain in the FRP laminates, the width of the main crack and tributary crack, as well as the phenomena of the test beams, the whole debonding process can be separated into three stages: initial debonding stage, stable debonding stage, and the final debonding failure. The fundamental reason of intermediate crack indued debonding are the opening-up of intermediate crack and the flexural deformation induced high interfacial shear stress and peeling stress. When the principal tension stress acting on the concrete substrate exceeded the tension stress of concrete, the CFRP laminate would debond from the concrete substrate.
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47

Longbiao, Li. "A time-dependent tensile constitutive model for long-fiber-reinforced unidirectional ceramic-matrix minicomposites considering interface and fiber oxidation." International Journal of Damage Mechanics 29, no. 7 (May 12, 2020): 1138–66. http://dx.doi.org/10.1177/1056789520924103.

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In this paper, a time-dependent tensile constitutive model of long-fiber-reinforced unidirectional ceramic-matrix minicomposites is developed considering the interface and fiber oxidation. The relationship between the time-dependent tensile behavior and internal damage is established. The damage mechanisms of time-dependent matrix cracking, fiber/matrix interface debonding, fiber failure, and the oxidation of the interface and fiber are considered in the analysis of the time-dependent tensile stress–strain curve. The fracture mechanic approach, matrix statistical cracking model, and fiber statistical failure model are used to determine the time-dependent interface debonding length, matrix crack spacing, and the fiber failure probability considering the time-dependent interface and fiber oxidation. The effects of the fiber volume, fiber radius, matrix Weibull modulus, matrix cracking characteristic strength, matrix cracking saturation spacing, interface shear stress, interface debonding energy, fiber strength, fiber Weibull modulus, and oxidation time on the time-dependent tensile stress–strain curves, matrix cracking density, interface debonding, and fiber failure are discussed. The experimental time-dependent tensile stress–strain curves, matrix cracking, interface debonding, and fiber failure of four different unidirectional SiC/SiC minicomposites for different oxidation time are predicted. The composite tensile strength and failure strain increase with the fiber volume, fiber strength, and fiber Weibull modulus, and decrease with the oxidation time; the fiber/matrix interface debonding length increases with the fiber radius and oxidation time and decreases with the interfacial shear stress and interface debonding energy; the fiber/matrix interface oxidation ratio increases with the interfacial shear stress, interface debonding energy, and oxidation time and decreases with the saturation matrix crack spacing.
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48

Dong, Yuan, Jia-Cao Yang, Xiao-Jun Wang, Gang Zhang, Mei-Lin Zhang, Zhi-Mei Wei, Sheng-Ru Long, and Jie Yang. "Improvement and Evaluation of a Device That Determines the Interfacial Shear Strength of Carbon Fiber/Polyphenylene Sulfide Composites." Polymers 15, no. 18 (September 13, 2023): 3749. http://dx.doi.org/10.3390/polym15183749.

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This study improved homemade apparatus for characterizing the interfacial shear strength (IFSS) of carbon-fiber-reinforced polyphenylene sulfide (PPS/CF) composites. The upgraded generation II experimental device includes a newly developed experimental clamp for samples, as well as testing systems. Compared with the initial generation I apparatus and the commercial Toei instrument, the generation II device is easier and more efficient to operate. The average interfacial adhesion values obtained using these devices were consistently approximately 40 MPa, with relatively low data scatter, showing excellent repeatability and applicability during microbond tests. Notably, the generation II experimental device was equipped with an additional high-frequency data-capturing tool to identify the debonding peak force more precisely, which demonstrated a higher interfacial shear strength of 42.81 MPa during testing. Therefore, the new instrument was able to reflect the change in the interfacial stress state during the interface debonding process more accurately and reliably.
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49

Liu, Dejun, Yihao Guo, and Xiaoyun Yao. "Interfacial Behaviour of Shield Tunnel Segment Strengthened by Thin Plate at Inner Surface." Advances in Materials Science and Engineering 2022 (August 10, 2022): 1–16. http://dx.doi.org/10.1155/2022/7715844.

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The strength and stiffness of a shield tunnel segment can be improved significantly by bonding a steel plate at its inner surface. In this kind of strengthened segment, interface debonding is usually the controlling failure mode, and it strongly depends on the interfacial stresses of the adhesive layer between the segment and the steel plate. To deepen the understanding of the interfacial behaviour, this study proposes a three-dimensional fine finite element (FE) model regarding the interfacial stresses. An existing full-scale experimental result is then employed to confirm the feasibility and accuracy of the proposed model. Further, the fine finite element model is used to calculate the interfacial stress distributions and to evaluate the structural parameters on the interfacial behaviour of the strengthened segment. A high concentration of interfacial stresses exists at the vicinity of the steel plate ends and the joints, which might result in premature failure at these locations. Both the normal and shear stresses at the interface are significantly influenced by the structural parameters. The findings in this study can provide guidance for the optimal design of strengthened shield segment that can prevent premature interfacial debonding.
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50

Min, Xinzhe, Dong Yang, Shoutan Song, and Xing Li. "Study on the Stress Threshold of Preventing Interfacial Fatigue Debonding in Concrete Beams Strengthened with Externally-Bonded FRP Laminates." Buildings 14, no. 2 (February 4, 2024): 430. http://dx.doi.org/10.3390/buildings14020430.

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Externally-bonded FRP laminate is widely used in structural strengthening due to the many advantages of FRP materials. Further enhancement of the strengthening effect can be achieved by inducing prestress into the FRP laminate. However, FRP debonding is still a main issue of this strengthening method, especially the Intermediate Crack-induced debonding (IC debonding). To better understand the impact of FRP debonding on the strengthening effect, a series of parameter analyses were conducted in this study based on the fatigue life prediction model proposed by the authors. The proposed model involves the fatigue damage accumulation of components of the beam, the mutual interaction between each component, and the impact of FRP fatigue debonding. As a result, a stress threshold for preventing FRP fatigue debonding in strengthening the concrete beam was proposed, which aimed to avoid safety hazards caused by IC debonding in practical engineering.
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