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Journal articles on the topic 'Crack Propagation Path'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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1

Lewicki, D. G., and R. Ballarini. "Effect of Rim Thickness on Gear Crack Propagation Path." Journal of Mechanical Design 119, no. 1 (1997): 88–95. http://dx.doi.org/10.1115/1.2828793.

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Analytical and experimental studies were performed to investigate the effect of rim thickness on gear tooth crack propagation. The goal was to determine whether cracks grew through gear teeth or through gear rims for various rim thicknesses. A finite element based computer program (FRANC, FRacture ANalysis Code) simulated gear tooth crack propagation. The analysis used principles of linear elastic fracture mechanics. Quarter-point, triangular elements were used at the crack tip to represent the stress singularity. The program had an automated crack propagation option in which cracks were grown
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2

Chao, Xu, and Shang Lei Yang. "Analysis on Fatigue Crack Propagation and Fractography of A7075 Aluminum Alloy." Applied Mechanics and Materials 217-219 (November 2012): 390–94. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.390.

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The fatigue fractography and surface of A7075 aluminum alloy was investigated by means of optical microscope, scanning electron microscope and technology of metallurgic replica. The results show that the fatigue crack generally initiated in the surface or near the surface of the sample area, such as hole and inclusion. The crack propagation regions under high stress amplitude was characterized by furrow and hollow, and obviously presented fine ripple vein. While lots of fatigue striations and sidesteps with the holes and secondary cracks generated in the crack propagation regions of low stress
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3

Hosseini-Toudeshky, Hossein, Bijan Mohammadi, and Pooya Saniei. "Fatigue Multi-Cracks Growths in Plates Using J-Integral Approach with a Developed Home FEM Software." Key Engineering Materials 560 (July 2013): 61–70. http://dx.doi.org/10.4028/www.scientific.net/kem.560.61.

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In this paper multiple fatigue cracks propagation are simulated in two-dimensional plates. Since re-meshing the cracked bodies in each increment of crack extension is a time-consuming and complicated procedure, numerical simulation of mixed-mode crack propagation with FEM is a difficulty. For this purpose, a FEM software is programmed and mesh refinement in each increment of crack is performed by Delaunay Refinement Algorithm. Using different refinement methods, complex boundaries such as multiple cracks and discontinuities which are closed together are easily refined by this algorithm. Crack
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4

Zhu, Chang Shun, Guo Lin Wang, Ping Ping Li, and Shang Wei Chen. "Crack-Propagating Direction of Tire Bead Rubber Determined by Jmax Criterion." Applied Mechanics and Materials 43 (December 2010): 628–32. http://dx.doi.org/10.4028/www.scientific.net/amm.43.628.

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Three-dimensional crack propagating path of tire bead rubber was the premise to study the crack propagation direction of bead. For this reason, Jmax Criterion was put forward. Utilized J integral maximum (Jmax) to determine the crack propagation direction of rubber. Calculated J-integral values of different preset directions by Abaqus built-in algorithm, obtained J (θ) curve which showed the Jmax and direction angle (θ) by fitting simulation data. Using Abaqus to set up two different crack model of bead rubber and simulate the crack propagation path, the results was consistent with the real cr
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5

Wei, Rongbing, Renbing Wu, and Kun Zhou. "Fatigue crack propagation in heterogeneous materials under remote cyclic loading." Journal of Micromechanics and Molecular Physics 01, no. 01 (2016): 1650003. http://dx.doi.org/10.1142/s242491301650003x.

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A fatigue model for the analysis of crack propagation in heterogeneous materials is developed. The crack propagation is driven by cyclic loading and affected by the presence of neighboring inclusions which can have initial eigenstrains such as thermal strain and misfit strain. The static Semi-analytic solution obtained by Zhou et al. [2011a] is utilized to obtain the full stress filed and the stress intensity factors. In order to simulate the crack propagation in heterogeneous materials, the maximum hoop stress criterion is applied to predict crack propagation directions and the Paris-type law
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6

Liu, Bang, Zheming Zhu, Ruifeng Liu, Lei Zhou, and Duanying Wan. "Study on the Fracture Behavior of Cracks Emanating from Tunnel Spandrel under Blasting Loads by Using TMCSC Specimens." Shock and Vibration 2019 (May 20, 2019): 1–13. http://dx.doi.org/10.1155/2019/2308218.

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Radial cracks may exist around tunnel edge, and these cracks may propagate and weaken tunnel stability under nearby blasting operations. In order to study the blast-induced fracture behavior of radial cracks emanating from a tunnel spandrel, a tunnel model containing a spandrel crack (TMCSC) with different inclination angles was proposed in this paper. Crack propagation gauges (CPGs) and strain gauges were used in the experiments to measure crack initiation moment and propagation time. Finite difference models were established by using AUTODYN code to simulate crack propagation behavior and pr
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7

Sadeghipour, Keyanoush, George Baran, Hanqing Zhang, and Wei Wu. "Modeling of Fatigue Crack Propagation During Sliding Wear of Polymers." Journal of Engineering Materials and Technology 125, no. 2 (2003): 97–106. http://dx.doi.org/10.1115/1.1543967.

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The propagation of a crack initiating at the surface was analyzed to simulate the fatigue wear behavior of glassy polymer materials. A crack in a material half plane was assumed to propagate along a predefined path as a result of contact loading by a cylinder sliding on the polymer surface. The crack path consisted of a vertical straight-line segment and a declined straight line originating at a branch point on the vertical crack segment. The stress intensity factors KI and KII along the crack path were computed by using finite element methods, and their values utilized in the Paris law to det
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8

Aoki, Y., T. Matsuyama, Yasuji Oda, Kenji Higashida, and Hiroshi Noguchi. "Effects of Hydrogen Gas Environment on Non-Propagation Phenomena of a Type 304 Austenitic Stainless Steel." Key Engineering Materials 297-300 (November 2005): 927–32. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.927.

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In order to investigate the hydrogen gas effect on non-propagation phenomena of a type 304 austenitic stainless steel, fatigue tests with in-situ observation using a Scanning Laser Microscope were performed in air, in 0.18MPa hydrogen gas and in 0.18MPa nitrogen gas. A nonpropagating crack was observed during the fatigue test in air. At almost the same stress level of non-propagating in air, non-propagating cracks were also observed in fatigue tests in hydrogen and in nitrogen. Stress level of the non-propagation is not sufficiently different in the three environments. However, the process up
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9

Sakane, Masao, Kazuhiro Itoh, Yutaka Tsukada, and Kenji Terada. "Crack Propagation Behavior at Sn37Pb-Copper Interface in Low Cycle Fatigue." Key Engineering Materials 353-358 (September 2007): 2962–65. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2962.

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This paper studies the crack propagation at Sn37Pb-copper interface in push-pull low cycle fatigue. Bonded specimens of Sn37Pb and copper having notch holes with different distances from the interface were fatigued at 313K and the crack propagation paths were observed. Cracks propagated at the interface when the notch hole was near the interface but propagated in the solder when the notch hole was away from the interface. The propagation rate of the interfacial crack was faster than that of non-interface crack. The crack path and crack propagation rate of the two types of cracks were discussed
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10

Kim, Hyo Jin, Sang Ho Lee, and Moon Kyum Kim. "Prediction of Crack Propagation under Dynamic Loading Conditions by Using the Enhanced Point Collocation Meshfree Method." Key Engineering Materials 324-325 (November 2006): 1059–62. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.1059.

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An efficient and accurate numerical program with enhanced point collocation meshfree method is developed to simulate crack propagation under dynamic loading conditions. The enhanced meshfree method with point collocation formulation and derivative approximation in solids is presented. This study also presents the crack propagation criterion and computation of propagating direction, and the total structure of the numerical program named PCMDYC(Point Collocation Meshfree method for DYnamic Crack propagation). Several examples of crack propagation under dynamic loads are analyzed to simulate the
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11

Toribio, Jesús, Beatriz González, and Juan-Carlos Matos. "Hydrogen-Assisted Fatigue Propagation in Corner Cracks at Holes Located in Plates under Tensile Loading." Metals 11, no. 4 (2021): 552. http://dx.doi.org/10.3390/met11040552.

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In this study, hydrogen-assisted fatigue propagation (a kind of corrosion fatigue phenomenon) in corner cracks at holes located in plates under tensile loading was studied, the results compared with those obtained for propagation by fatigue in air. To this end, numerical modeling was carried out for the case studied to evaluate the advance of the crack front based on the Paris equation and the stress intensity factors (SIFs) obtained by Raju and Newman. The results showed that the cracks tended toward a preferential propagation path in their growth, the effect of the presence of the stress con
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12

Oshima, Kento, Tomohiro Takaki, and Mayu Muramatsu. "Development of multi-phase-field crack model for crack propagation in polycrystal." International Journal of Computational Materials Science and Engineering 03, no. 02 (2014): 1450009. http://dx.doi.org/10.1142/s2047684114500092.

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It is vitally important to ensure the safety of brittle materials. Therefore, it is essential to deeply understand the interaction of the material's microstructure and crack propagation. In this study, we constructed a multi-phase-field crack model which can express crack propagation in polycrystal. To evaluate the basic characteristics of the developed model, we performed two-dimensional crack propagation simulations in a bicrystal where a crack enters an inclined grain boundary by changing the ratio of the grain boundary energy to the crack surface energy. As a result, it is confirmed that t
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13

Bi, Yueqi, Xiaoming Yuan, Jishuang Lv, Rehmat Bashir, Shuai Wang, and He Xue. "Effect of Yield Strength Distribution Welded Joint on Crack Propagation Path and Crack Mechanical Tip Field." Materials 14, no. 17 (2021): 4947. http://dx.doi.org/10.3390/ma14174947.

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Due to the particularity of welding processes, the mechanical properties of welded joint materials, especially the yield strength, are unevenly distributed, and there are also a large number of micro cracks, which seriously affects the safety performance of welded joints. In this study, to analyze the effect of the uneven distribution of yield strength on the crack propagation path of welded joints, other mechanical properties and residual stresses of welded joints are ignored. In the ABAQUS 6.14 finite element software, the user-defined field (USDFLD) subroutine is used to define the unevenly
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14

Yu, Jia, Yi Zhuo Liu, and Rong Rong Shi. "Studies on Crack Propagation of Carbon Fiber Reinforced Epoxy Resin Composite." Advanced Materials Research 79-82 (August 2009): 1029–33. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1029.

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Unidirectional carbon fibre reinforced resin matrix composite (CFRP) with different fibre volume fraction are stretched dynamically under static load in SEM, initiation and propagation mechanism of crack is in-situ observed, and tensile fracture of specimens is also observed. The results show that: Microscopic cracks are mainly originated from fracture of fibre, numerous fibre cracks transfixion each other in form of matrix or interface cracking, and cause failure of CFRP. Microscopic crack propagation path is related to the thickness of matrix layer between fibres. Propagation of single fibre
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15

Zhang, Hai, Shaopo Li, Wenhua Ding, and Ning Hao. "Research on hydrogen-induced cracking behavior of normalized pipeline steel." MATEC Web of Conferences 175 (2018): 01027. http://dx.doi.org/10.1051/matecconf/201817501027.

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Hydrogen sulfide corrosion test was used to test the hydrogen-induced cracking sensitivity of the normalized BNS pipeline steel. The microstructure and morphology of hydrogen induced crack(HIC) of the normalized BNS pipeline steel after hydrogen sulfide corrosion test were observed with optical microscopy(OM), scanning electron microscopy(SEM). Combined with electron probe microanalyzer(EPMA) and hardness test, the hydrogen-induced cracking behavior of BNS pipeline steel was studied from the aspects of microstructure, crack morphology, center segregation and harness. The results showed that th
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16

Chekunaev, Nikolay I., and Anatoly M. Kaplan. "Acceleration, Retardation and Crack Arrest in Stressed Heterogeneous Structures." Key Engineering Materials 462-463 (January 2011): 506–11. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.506.

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Hamiltonian of the solid body with a crack inside in field of tensile stresses was derived. Hamiltonian equations describe process of crack propagation. A crack propagation was considered in heterogeneous material when in ground matrix present inclusions with work-of-fracture per unit surface significantly greater than in the matrix. Condition of cracks arrest in such system was found and length of path, passed until crack’s stop, was calculated.
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17

Sorbello, Fabio, Peter E. J. Flewitt, A. G. Crocker, and Gillian E. Smith. "A Consideration of Cleavage Crack Propagation in Fe2Si Steel." Key Engineering Materials 385-387 (July 2008): 1–4. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.1.

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It is well established that within the lower-shelf temperature range of Fe2-3Si polycrystalline steels, the brittle fracture occurs predominately by transgranular cleavage, unless subject to embrittling heat-treatments. The cleavage fracture develops on the well established {001} planes of the bcc structure. In this paper we revisit the growth, of these cleavage cracks by considering crack propagation in single crystals of Fe2Si steel. Three point bend specimens manufactured from oriented crystals have been tested by impact loading at a temperature of -196°C. High spatial resolution focused io
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18

Theilig, Holger, Dirk Holländer, and Michael Wünsche. "Simulation of Curved Fatigue Crack Growth with Calculation of the Plastic Limit Load." Key Engineering Materials 417-418 (October 2009): 45–48. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.45.

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In this paper a higher order crack path simulation algorithm for multiple interacting cracks is presented using piecewise parabolic curved increments including the consideration of the plastic limit loads. For this reason, the program PCCS-2D has been extended to analyse the crack growth and the plastic limit load for each crack propagation step in a fully automatic simulation. The proposed solution algorithm provides a powerful tool for flaw assessment with the FAD proce¬dure in combination with a numerical crack path simulation. Several numerical examples are pre¬sented to show the accuracy
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19

Kotoul, Michal, Oldřich Ševeček, and Tomáš Profant. "Modelling of Crack Bifurcation in Laminar Ceramics with Large Compressive Stress." Key Engineering Materials 488-489 (September 2011): 130–33. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.130.

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Ceramic laminates designed with strong interfaces have shown crack growth resistance (R-curve) behaviour through microstructural design (e.g. grain size, layer composition) and/or due to the presence of compressive residual stresses, acting as a barrier to crack propagation. The goal of the contribution is to model the mechanism of crack bifurcation in laminar ceramics with large compressive stress which still have not been satisfactory explained. Experimental observations of the crack path in the multilayered ceramics tested under several kinds of loading showed crack penetration (i.e. crack
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20

Li, Qingbo, Nengxiong Xu, Weifeng Wan, and Yazhe Li. "Modeling of Shear Crack Propagation in Rock Masses Using Mesh-Free LRPIM." Advances in Civil Engineering 2021 (March 25, 2021): 1–13. http://dx.doi.org/10.1155/2021/6654812.

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The modeling of shear cracks in materials is critical in various engineering applications, such as the safety analysis of concrete structures and stability analysis of rock slopes. Based on the idea of Goodman element, the elastic-plastic constitutive model of the shear cracks is derived, and the elastic-plastic analysis of shear crack propagation is realized in the local radial basis point interpolation method (LRPIM). This method avoids the loss of accuracy caused by the mesh in the analysis of fracture propagation, and the crack propagation of rock brittle material is simulated. The investi
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21

Saryazdi, M. G., and M. Durali. "The effect of three-dimensional crack growth on the force distribution and meshing stiffness of a spur gear: Ideal and misaligned contacts." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 7 (2009): 1633–44. http://dx.doi.org/10.1243/09544062jmes1217.

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This article presents a routine for prediction of the crack growth path in gears. Crack simulation helps in determining failure modes and crack detecting by vibration monitoring. To simulate crack propagation an effective method is developed by which the meshing force is calculated based on the compliance of meshing teeth in every stage of crack growth. In this method the compliance matrix of the tooth is calculated using three-dimensional boundary element analysis without the need for simultaneously modelling two meshing gears. The force distribution on the contact area is then calculated usi
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22

Su, Zhao Bin, Zong Xi Cai, and Yi Lan Kang. "An Element Splitting Algorithm for Crack Propagation." Applied Mechanics and Materials 90-93 (September 2011): 2277–81. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.2277.

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A new algorithm is presented for the finite element analysis of fracture mechanics. The algorithm allows crack propagation in any direction, and guarantees the crack path smoothly. This is achieved by tracking the path of the crack tip and by introducing a new remeshing method. Examples show that this algorithm is efficient for 2D problems.
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23

Majer, Zdeněk, Luboš Náhlík, Kateřina Štegnerová, Pavel Hutař, and Raúl Bermejo. "Study of Influence of Residual Stresses on Crack Propagation in Particulate Ceramic Composites." Solid State Phenomena 258 (December 2016): 178–81. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.178.

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The aim of the present work is to analyze the influence of residual stresses in the particulate ceramic composite on the crack propagation. The crack propagation direction was estimated using Sih’s criterion based on the strain energy density factor. A two-dimensional finite element model was developed for determination of crack path. The residual stresses resulting from the mismatch of coefficients of thermal expansion during the fabrication process of the composite were implemented to the computational model. The effect of the particles shape on the crack propagation was investigated. Conclu
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24

Li, Qiang, Yan Liang Shang, Yang Wang, and Ying Chun Fu. "Study on the Difference of the Propagation Characteristics between Open Flaws and close Flaws in Brittle Materials under Compressive Loading." Advanced Materials Research 197-198 (February 2011): 1406–11. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1406.

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The second development of ABAQUS is implemented to simulate the initiation, propagation processes of flaws in brittle materials under compressive loading (in the paper ‘flaw’ means ‘the initial crack’, and ‘crack’ means ‘the branch crack’), by which the propagation paths and the corresponding stress intensity factors of the branch crack can be calculated. Further more the experiment is carried out to verify the validity of the above numerical method. By the numerical method, the propagation processes of open flaws and close flaws are simulated, and the comparative analysis of propagation chara
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25

Tilbrook, Matthew, Lyndal Rutgers, Robert J. Moon, and Mark Hoffman. "Fracture and Fatigue Crack Propagation in Graded Composites." Materials Science Forum 492-493 (August 2005): 573–80. http://dx.doi.org/10.4028/www.scientific.net/msf.492-493.573.

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The propagation of cracks in graded materials under monotonic and cyclic loading was investigated via experiment and simulation. Graded alumina/epoxy composite specimens exhibiting a variation in composition from 5% to 65% epoxy, representing a twenty-fold variation in Young’s modulus, across a region of width between 6 and 20 mm, were produced by a multistep infiltration technique. Crack initiation and propagation under monotonic and cyclic four-point bend loading was monitored and crack trajectories and growth rates were measured. Initial crack deflection was observed, in agreement with theo
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26

Hu, Xiaodong, Jie Xu, Xiangmei Du, Yong Zhang, and Fan Zhou. "Research on Fatigue Crack Propagation of 304 Austenitic Stainless Steel Based on XFEM and CZM." Metals 10, no. 6 (2020): 727. http://dx.doi.org/10.3390/met10060727.

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The fatigue crack propagation of 304 austenitic stainless steel was studied both by experiments and numerical simulations. Two methods were applied to simulate the crack propagation: the extended finite element method (XFEM) and the cohesive zone model (CZM). Based on the XFEM, the direct cyclic solver was used to simulate the fatigue crack propagation. Based on the CZM, the VUMAT subroutine was used to describe the crack tip constitutive equation during fatigue crack propagation, and the mechanical properties of the crack tip were simulated. The effects of different frequency, f, and stress r
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27

Ke, Chien-Chung, Cheng-Lung Kuo, Shih-Meng Hsu, Shang-Chia Liu, and Chao-Shi Chen. "Two-Dimensional Fracture Mechanics Analysis Using a Single-Domain Boundary Element Method." Mathematical Problems in Engineering 2012 (2012): 1–26. http://dx.doi.org/10.1155/2012/581493.

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This work calculates the stress intensity factors (SIFs) at the crack tips, predicts the crack initiation angles, and simulates the crack propagation path in the two-dimensional cracked anisotropic materials using the single-domain boundary element method (BEM) combined with maximum circumferential stress criterion. The BEM formulation, based on the relative displacements of the crack tip, is used to determine the mixed-mode SIFs and simulate the crack propagation behavior. Numerical examples of the application of the formulation for different crack inclination angles, crack lengths, degree of
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28

Rozgonyi, George A., Khaled M. Youssef, P. Kulshreshtha, M. Shi, and Ethan Good. "Silicon PV Wafers: Mechanical Strength and Correlations with Defects and Stress." Solid State Phenomena 178-179 (August 2011): 79–87. http://dx.doi.org/10.4028/www.scientific.net/ssp.178-179.79.

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Nanoindentation was used to measure the mechanical properties of 200mm diameter (100) CZ Si wafers subjected to the initiation and propagation of micro-crack defects. Silicon amorphization and phase changes were observed and accompanied by a monotonic decrease in hardness and elastic modulus, as the nanoindent tip approached the micro-crack shank or point. Identification and profiling of these localized phase transitions was obtained in the vicinity of the micro-cracks using electron back-scattered diffraction (EBSD) and Raman spectroscopy. It was found that the amorphous Si regions extend for
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29

Yang, Bin, Qin Shou Huang, Ping Liang, and Hua Xu. "Simulation of Reflective Crack Propagation Path in Asphalt Overlay under the Partial Wheel Load." Advanced Materials Research 189-193 (February 2011): 2001–4. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2001.

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Partial wheel load is one of the main causes that lead to shear-type reflective crack of asphalt overlay in the old cement concrete pavement. Based on the theory of fracture mechanics and finite element method, this paper focuses on the numerical simulation of the reflective crack propagation path in asphalt overlay under the partial wheel load. Calculation result and analysis show that reflective crack partially expands upwards at the side of wheel load under the effect of partial wheel load with a sequential increase of crack propagation length. As the crack propagation length increases, str
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Wang, Minqing, Jinhui Du, and Qun Deng. "The Mechanism of Creep during Crack Propagation of a Superalloy under Fatigue–Creep–Environment Interactions." Materials 13, no. 19 (2020): 4418. http://dx.doi.org/10.3390/ma13194418.

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In this study, we examine the mechanism of fatigue-crack propagation in 718Plus superalloy at 704 °C under fatigue–creep–environment interactions, in this case, a new turbine disc material used in aero-engines at high temperatures. The effect of creep on the fatigue-crack propagation of the superalloy at high temperature was also researched. There was an unusual inhibitory effect on the propagation of fatigue cracks in 718Plus alloy, in which the propagation rate of fatigue cracks decreased with the increase of creep time through exploration of dwell-fatigue-crack growth (DFCG) test with diffe
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31

He, Longlong, Zhifang Liu, Junjie Gu, Jinliang Wang, and Kunfa Men. "Fatigue Crack Propagation Path and Life Prediction Based on XFEM." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 4 (2019): 737–43. http://dx.doi.org/10.1051/jnwpu/20193740737.

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Based on the theory of linear elastic fracture mechanics, the relationships between material constants c3, c4 required in Abaqus and constants C, m in Paris formula are derived. Then extended finite element method (XFEM) of Abaqus software is used to is used to predict the crack propagation path and life of the plate with center inclined through crack and typical stiffened wing spar with initial crack under the constant amplitude fatigue load. The results show that the predicted crack propagation path is in good agreement with the experimental results, and the crack propagation life error is l
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32

Ke, Chien Chung, Wong Rui Lee, Shih Meng Hsu, and Chao Shi Chen. "Modelling of Crack Propagation in Anisotropic Material Using Single-Domain Boundary Element Method." Key Engineering Materials 560 (July 2013): 87–98. http://dx.doi.org/10.4028/www.scientific.net/kem.560.87.

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This paper evaluates the stress intensity factors (SIFs) at the crack tips, predicts the crack initiation angles and simulates the crack propagation path in the two-dimensional cracked anisotropic materials using the single-domain boundary element method (SDBEM) combined with maximum circumferential stress criterion. Numerical examples of the application of the formulation for different crack inclination angles, crack lengths, degree of material anisotropy, and crack types are presented. Furthermore, the propagation path in Cracked Straight Through Brazilian Disc (CSTBD) specimen is numericall
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33

Sun, Zhi Jia, and You Tang Li. "Quasi-Static Simulation of Crack Propagation on Elastic Material with Material Discontinuous Zone." Advanced Materials Research 746 (August 2013): 211–14. http://dx.doi.org/10.4028/www.scientific.net/amr.746.211.

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A numerical method to simulate the crack propagation based on the maximum circumferential stress theory is presented in this paper. The FEM method is used to estimate the influence of the material discontinuous zone on the propagation path of the crack placed in close to it in the matrix. When the crack grows, the FEM method uses the maximum circumferential stress theory to determine the propagation direction and the elements re-meshing program to ensure the accuracy of the crack-tip stress field. The crack propagation paths in the matrix with different material zone are simulated by the metho
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34

Saimoto, Akihide, A. Toyoda, and Y. Imai. "Crack Propagation under Compressive Stress Influenced by Crack Face Asperity." Key Engineering Materials 324-325 (November 2006): 125–28. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.125.

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The influence of surface roughness in crack face on the behavior of crack growth is studied. Numerical results derived from two kinds of mechanical models representing the macroscopic and microscopic asperity supposed to exist in the face of an initial crack are compared. In macro-asperity model, the influence of location and size of single-triangular asperity on the stress intensity factor is evaluated. In this model, it is found that the mode-I stress singularity appears in certain circumstances even under overall compression. In micro-asperity model, influence of friction coefficient on the
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35

Luo, Ping, Gu Hui Gao, Xiao Lu Gui, Bai Feng An, Zhun Li Tan, and Bing Zhe Bai. "Charpy Impact Properties of Grain Boundary Allotriomorphic Ferrite and Granular Bainite Duplex Microstructure." Advanced Materials Research 1004-1005 (August 2014): 1236–44. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.1236.

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A new type of high strength and low cost bainitic steel with ultra-low carbon content and high Si content has been developed on the basis of Mn-series air-cooling bainitic steels. The tensile properties of YS>690MPa and the impact toughness of AKV>60J at-40°C were obtained by controlling the processing parameters. This was attributed to the formation of the grain boundary allotriomorphic ferrite (FGBA) and the granular bainite (GB) with different shape of M/A islands. The high strength due to the inter-lath lamellar M/A islands or retained austenite companying with high dislocated bainit
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Li, Chengxiao, Yuantong Zhang, Peng Xu, and Chen An. "Study on Crack Propagation of the Tunnel Model under Dynamic Loading." Advances in Materials Science and Engineering 2021 (April 24, 2021): 1–18. http://dx.doi.org/10.1155/2021/6672574.

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Crack defects make it difficult to predict the dynamic fracture of tunnel specimens under an impact load. To study the impact of the velocity and crack location on a roadway under dynamic load, specimens with tunnel-type voids were made using polymethyl methacrylate. The split-Hopkinson bar was used as the loading method, and a digital laser dynamic caustics system was used to observe the fracture process of the specimens. The dynamic fracture process was evaluated by the crack propagation velocity, displacement, and dynamic stress intensity factor. To predict and verify the test results, ABAQ
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37

Curà, Francesca, Andrea Mura, and Carlo Rosso. "Investigation of crack propagation path in tube gears." Procedia Structural Integrity 7 (2017): 476–83. http://dx.doi.org/10.1016/j.prostr.2017.11.115.

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38

Fujimoto, K., and T. Shioya. "A STUDY ON PATH OF DYNAMIC CRACK PROPAGATION." Le Journal de Physique Colloques 46, no. C5 (1985): C5–233—C5–238. http://dx.doi.org/10.1051/jphyscol:1985530.

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39

Xu, Peng, Renshu Yang, Yang Guo, and Zhicheng Guo. "Investigation of the Blast-Induced Crack Propagation Behavior in a Material Containing an Unfilled Joint." Applied Sciences 10, no. 13 (2020): 4419. http://dx.doi.org/10.3390/app10134419.

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This study uses a dynamic caustic technique to study the crack propagation in a medium containing an unfilled joint under blasting. The results show that for the medium containing a vertical unfilled joint, the reflected dilatational wave from the joint tends to suppress both the K I d and the velocity of the opposite propagating crack. However, for the medium containing an oblique joint, the reflected wave from the joint increases K II d , and induces the opposite propagating crack deflect from its original path. Compared with the medium with a vertical joint, the wing cracks are more easy to
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40

Fageehi, Yahya Ali. "Fatigue Crack Growth Analysis with Extended Finite Element for 3D Linear Elastic Material." Metals 11, no. 3 (2021): 397. http://dx.doi.org/10.3390/met11030397.

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This paper presents computational modeling of a crack growth path under mixed-mode loadings in linear elastic materials and investigates the influence of a hole on both fatigue crack propagation and fatigue life when subjected to constant amplitude loading conditions. Though the crack propagation is inevitable, the simulation specified the crack propagation path such that the critical structure domain was not exceeded. ANSYS Mechanical APDL 19.2 was introduced with the aid of a new feature in ANSYS: Smart Crack growth technology. It predicts the propagation direction and subsequent fatigue lif
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Wang, Zheng, Kui Wang, Lu Wang, and Zi Hao Zhao. "Study on Group Behavior of Short Crack for Low Cycle at High Temperature Based on Fractal Theory." Advanced Materials Research 228-229 (April 2011): 1143–49. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.1143.

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The propagation of fatigue short crack is a fractal curve, the irregular path can be described by fractal dimension. The fractal dimension of the crack implicit in many of the physical factors, such as microstructure of material, load conditions and so on. In this paper, the short crack for low cycle at high temperature is studied. The material 20# steel in the various stress state is experimentally studied, the initiation, propagation and coalescence influence of short crack are observed. By analyzing experiment results, characters of crack fractal dimensions evolving with the cycle process a
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Majer, Zdeněk, Kateřina Štegnerová, Pavel Hutař, Martin Pletz, Raul Bermejo, and Luboš Náhlík. "Residual Lifetime Determination of Low Temperature Co-Fired Ceramics." Key Engineering Materials 713 (September 2016): 266–69. http://dx.doi.org/10.4028/www.scientific.net/kem.713.266.

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The effect of subcritical crack growth is nowadays intensively studied mainly in relation to the strength of ceramic materials. The main aim of the contribution is to describe behavior of micro-crack propagating in the Low Temperature Co-fired Ceramics (LTCC) under subcritical crack growth (SCCG) conditions. The micro-crack behavior is significantly influenced by residual stresses developed in the LTCC due to different coefficients of thermal expansion of individual components. Two-dimensional numerical model was developed to simulate micro-crack propagation through the composite. The micro-cr
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Song, Leying, Songhe Meng, Chenghai Xu, Guodong Fang, Qiang Yang, and Weihua Xie. "Crack kinking and tunneling simulation for the single-fiber composite under transverse tension based on phase-field method." Journal of Strain Analysis for Engineering Design 55, no. 5-6 (2020): 145–58. http://dx.doi.org/10.1177/0309324720906931.

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Virtual tests for a single-fiber–reinforced composite model subjecting to transverse tension are carried out based on a phase-field method considering a varying interface toughness parameter. Without pre-treating the crack initiation location and propagation path, the complete fracture process is realized for the first time in a three-dimensional numerical model, including nucleation cracks on the fiber/matrix interface at the free end, tunneling cracks along the fiber axis, and kinked interface cracks deviating from the interface and penetrating into the matrix. The numerically calculated cra
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44

Pineau, André. "Crossing grain boundaries in metals by slip bands, cleavage and fatigue cracks." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2038 (2015): 20140131. http://dx.doi.org/10.1098/rsta.2014.0131.

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The size and the character (low and large angle, special boundaries, tilt and twist boundaries, twins) of the grain boundaries (GBs) in polycrystalline materials influence their strength and their fracture toughness. Recent studies devoted to nanocrystalline (NC) materials have shown a deviation from the Hall–Petch law. Special GBs formed by Σ3 twins in face-centred cubic metals are also known to have a strong effect on the mechanical behaviour of these metals, in particular their work-hardening rate. Grain orientation influences also crack path, the fracture toughness of body-centred cubic (B
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45

Falkenberg, Rainer. "Simulation of Environmentally-Assisted Material Degradation by a Thermodynamically Consistent Phase-Field Model." Key Engineering Materials 713 (September 2016): 38–41. http://dx.doi.org/10.4028/www.scientific.net/kem.713.38.

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Environmentally-assisted material degradation involves mass transport and mechanical processes interacting in the material. A well-known example is hydrogen-induced stress-corrosion cracking. One major challenge within this scope is the quantification of the coupling mechanisms in question. The computational modeling of environmentally-assisted cracks is the key objective ofthis investigation and realised within the theory of gradient-extended dissipative continua with length-scales. The modeling of sharp crack discontinuities is replaced by a diffusive crack model based onthe introduction of
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LAZZARONI, GIULIANO, and RODICA TOADER. "A MODEL FOR CRACK PROPAGATION BASED ON VISCOUS APPROXIMATION." Mathematical Models and Methods in Applied Sciences 21, no. 10 (2011): 2019–47. http://dx.doi.org/10.1142/s0218202511005647.

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In the setting of antiplane linearized elasticity, we show the existence of quasistatic evolutions of cracks in brittle materials by using a vanishing viscosity approach, thus taking into account local minimization. The main feature of our model is that the path followed by the crack need not be prescribed a priori: indeed, it is found as the limit (in the sense of Hausdorff convergence) of curves obtained by an incremental procedure. The result is based on a continuity property for the energy release rate in a suitable class of admissible cracks.
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Buffière, Jean Yves, Emilie Ferrié, Wolfgang Ludwig, and Anthony Gravouil. "Characterisation and Modelling of the Three Dimensional Propagation of Short Fatigue Cracks." Materials Science Forum 519-521 (July 2006): 997–1004. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.997.

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This paper reports recent results on the characterisation and modelling of the three dimensional (3D) propagation of small fatigue cracks using high resolution synchrotron X ray micro-tomography. Three dimensional images of the growth of small fatigue cracks initiated in two Al alloys on natural or artificial defects are shown. Because of the small size of the investigated samples (millimetric size), fatigue cracks grown in conventional Al alloys with a grain size around 100 micrometers can be considered as microstructurally short cracks. A strong interaction of these cracks with the grain bou
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Wang, Ying, Wenhui Zhang, Xu Pan, and Yuqian Zheng. "Experimental Study on Fatigue Crack Propagation of High-Strength Steel Wire with Initial Defects for Bridge Cables." Applied Sciences 10, no. 12 (2020): 4065. http://dx.doi.org/10.3390/app10124065.

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In order to study the effect of initial defects on fatigue crack propagation law, a test method to identify fatigue crack propagation rate and path based on load waveform variation was presented, and a new test device was designed to apply fatigue pulsation loads to multiple wires for bridge cables simultaneously in this paper. To simplify the corrosion defect formation process, a machine-cut notch was used to describe the initial defect on the steel wire surface. Firstly, fatigue crack propagation tests were conducted on the surface notched steel wire specimens. By using crack front marking t
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49

Sherman, Dov. "Fractography of Dynamic Crack Propagation in Silicon Crystal." Key Engineering Materials 409 (March 2009): 55–64. http://dx.doi.org/10.4028/www.scientific.net/kem.409.55.

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The phenomena occurring during rapid crack propagation in brittle single crystals were studied by cleaving silicon specimens on the low energy cleavage planes under tensile and bending. The experiments revealed new phenomena not previously reported, and new crack path instabilities in particular. The well defined boundary conditions of the tested specimens and crack velocity measurements enabled rationalization of the observed phenomena and the velocity-surface instabilities relationship in particular. In contrast to amorphous materials, the observed instabilities are generated at relatively l
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50

Ozelo, R. R. M., P. Sollero, and A. L. A. Costa. "An Alternative Technique to Evaluate Crack Propagation Path in Hyperelastic Materials." Tire Science and Technology 40, no. 1 (2012): 42–58. http://dx.doi.org/10.2346/1.3684484.

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Abstract REFERENCE: R. R. M. Ozelo, P. Sollero, and A. L. A. Costa, “An Alternative Technique to Evaluate Crack Propagation Path in Hyperelastic Materials,” Tire Science and Technology, TSTCA, Vol. 40, No. 1, January–March 2012, pp. 42–58. ABSTRACT: The analysis of crack propagation in tires aims to provide safety and reliable life prediction. Tire materials are usually nonlinear and present a hyperelastic behavior. Therefore, the use of nonlinear fracture mechanics theory and a hyperelastic material constitutive model are necessary. The material constitutive model used in this work is the Moo
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