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Journal articles on the topic 'Crack initiation and propagation'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Zhu, Yong, Ray K. L. Su, and Qi Cai Yu. "Initial Crack Propagation Directions of Branched Crack under Tension with Finite Element Analysis." Advanced Materials Research 168-170 (December 2010): 2553–57. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2553.

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The initial crack propagation directions of branched cracks under tension are investigated. In this study, the material is assumed to be brittle and deformed linear elastically. The elastic stress fields and stress intensity factors are obtained by using finite element analysis method. Various parameters which including the lengths, the directions and the locations of branched cracks are investigated to study their effects on the crack initiation angles. Three kinds of crack propagation criteria are employed to obtain the crack initiation angles. The effects of crack propagation directions due

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2

Tong, Fengzhuang, Liang Gao, Xiaopei Cai, Yanglong Zhong, Wenqiang Zhao, and Yichen Huang. "Experimental and Theoretical Determination of the Frost-Heave Cracking Law and the Crack Propagation Criterion of Slab Track with Water in the Crack." Applied Sciences 9, no. 21 (2019): 4592. http://dx.doi.org/10.3390/app9214592.

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Crack propagation produced by frost heave affects the durability of slab-track structures in high-humidity and cold regions in China. This work is intended to reveal the evolution laws of frost-heave crack propagation, establish evaluation criteria for crack propagation, and investigate factors involved in frost-heave crack propagation. Firstly, by preparing slab-track specimens with initial cracks, an experiment of frost-heave crack propagation was designed. The process of frost-heave crack propagation was carried out by means of digital image correlation (DIC) technology and acoustic emissio

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3

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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4

Ma, C. C., and P. Burgers. "Initiation, Propagation, and Kinking of an Antiplane Crack." Journal of Applied Mechanics 55, no. 1 (1988): 111–19. http://dx.doi.org/10.1115/1.3173615.

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An infinite linear elastic body containing a semi-infinite crack is loaded by a planar antiplane stress pulse parallel to the crack. The stress wave strikes the crack at time t=0 and at some arbitrary later time tf, the crack begins to extend straight ahead with constant speed vo. After some later tb, the crack suddenly stops, then kinks and propagates with constant speed vc, making an angle δ with the original crack. A superposition scheme is used to construct the exact full-field solution of the propagating crack. The full-field solution for stresses for the constant speed propagating crack

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5

Shao, Peng, Yong Zhang, Wen Ming Gao, and Yong Qiang Liu. "Dynamic Response of Intermittent Jointed Rock Mass Subjected to Blast Waves." Key Engineering Materials 306-308 (March 2006): 1415–20. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1415.

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The propagation of blast waves in intermittent jointed rock masses will result in a complex interaction between propagating waves and rock joints. Such being the case, the analysis of dynamic response of rock masses is important to rock engineering design and stability prediction. In this paper, the fracture process of intermittent jointed rock mass subjected to blast waves and initial static field, including wing crack initiation, propagation and arrest, is analyzed using linear superposition principle and sliding crack model. Crack initiation conditions and propagation lengths under incident

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6

Wang, Jianning, Weitao Liu, and Jianjun Shen. "Investigation on the Fracturing Permeability Characteristics of Cracked Specimens and the Formation Mechanism of Inrush Channel from Floor." Shock and Vibration 2021 (April 2, 2021): 1–12. http://dx.doi.org/10.1155/2021/8858733.

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To study the fracture characteristics and the permeability change law of the cracked specimens during the complete stress-strain process, a mechanical model was constructed, from which different types of crack initiation angles were obtained. The crack inclination angles under uniaxial compression, confining compression, and confining tension, and the influence of confining pressure and pore water pressure on the crack propagation and permeability of rock mass were investigated and simulated with RFPA-Flow software using prefabricated crack models with crack initiation angles of 30°, 45°, and

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7

Han, Jeong Woo, Seung Ho Han, Byung Chun Shin, and Jae Hoon Kim. "Fatigue Crack Initiation and Propagation Life of Welded Joints." Key Engineering Materials 297-300 (November 2005): 781–87. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.781.

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The fatigue life of welded joints is associated with crack initiation and propagation life. Theses cannot be easily separated, since the definition of crack initiation is vague due to the initiation of multiple cracks that are distributed randomly along the weld toes. In this paper a method involving a notch strain and fracture mechanical approach, which considers the characteristics of welded joints, e.g. welding residual stress and statistical characteristics of multiple cracks, is proposed, in an attempt to reasonably estimate these fatigue lives. The fatigue crack initiation life was evalu

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8

Wang, Xi Shu, Jing Hong Fan, Bi Sheng Wu, and Ying Li. "Effects of Distance and Alignment Holes on Fatigue Crack Behaviors of Cast Magnesium Alloys." Advanced Materials Research 33-37 (March 2008): 13–18. http://dx.doi.org/10.4028/www.scientific.net/amr.33-37.13.

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To study the fatigue microcrack initiation and propagation behaviors of cast magnesium alloys, the small fatigue crack propagation tests were carried out using the in-situ observation with scanning electron microscope (SEM). All initiations and propagations of fatigue small cracks focused on effects of the interaction of artificial two small holes, which there are the different distances and alignments of two small holes. The results indicate that the fatigue small cracks of cast magnesium alloys occurred mainly at the defects or root of notch but the early stage crack propagations were influe

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9

Huang, Y. S., and O. H. Yeoh. "Crack Initiation and Propagation in Model Cord-Rubber Composites." Rubber Chemistry and Technology 62, no. 4 (1989): 709–31. http://dx.doi.org/10.5254/1.3536270.

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Abstract The present study suggests that the development of penny-shaped cracks at cord ends is the first stage of fatigue failure of cord-rubber composites. An approximate theory for calculating the strain-energy release rate (tearing energy) for the propagation of penny-shaped cracks and predicting the life of model composites has been outlined. The basic premise of this theory is that the rate of propagation of these penny-shaped cracks is governed by the usual crack-growth characteristics of rubber vulcanizates customarily determined using simple test pieces such as the pure-shear test pie

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10

Ahmed, Shafique, Thomas Schumacher, Erik T. Thostenson, and Jennifer McConnell. "Performance Evaluation of a Carbon Nanotube Sensor for Fatigue Crack Monitoring of Metal Structures." Sensors 20, no. 16 (2020): 4383. http://dx.doi.org/10.3390/s20164383.

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This article describes research that investigated the ability of a carbon nanotube (CNT) sensor to detect and monitor fatigue crack initiation and propagation in metal structures. The sensor consists of a nonwoven carrier fabric with a thin film of CNT that is bonded to the surface of a structure using an epoxy adhesive. The carrier fabric enables the sensor to be easily applied over large areas with complex geometries. Furthermore, the distributed nature of the sensor improves the probability of detecting crack initiation and enables monitoring of crack propagation over time. Piezoresistivity

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11

Liu, Jiangwei, Changyou Liu, and Qiangling Yao. "Mechanisms of Crack Initiation and Propagation in Dense Linear Multihole Directional Hydraulic Fracturing." Shock and Vibration 2019 (December 7, 2019): 1–15. http://dx.doi.org/10.1155/2019/7953813.

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Artificially fracturing coal-rock mass serves to form break lines therein, which is related to the distribution of cracked boreholes. For this reason, we use physical experiments and numerical simulations to study the crack initiation and propagation characteristics of dense linear multihole drilling of fractured coal-rock mass. The results indicate that only in the area between the first and last boreholes can hydraulic fracturing be controlled by dense linear multihole expansion along the direction of the borehole line; in addition, no directional fracturing occurs outside the drilling secti

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12

Nakai, Yoshikazu, Daiki Shiozawa, Shoichi Kikuch, et al. "Observation of Flaking Process in Rolling Contact Fatigue by Laminography Using Ultra-bright Synchrotron Radiation." MATEC Web of Conferences 165 (2018): 11002. http://dx.doi.org/10.1051/matecconf/201816511002.

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The flaking failure in rolling contact fatigue (RCF) results from crack initiation and propagation has been believed to originate from non-metallic inclusions located beneath the surface. With conventional microscopies, however, damage process in the internal region of materials could not be observed, then RCF crack initiation and propagation behaviours were observed by using synchrotron radiation computed laminography (SRCL) in the brightest synchrotron facility in Japan, and the effect of the inclusion orientation on the RCF property was examined. In our previous studies, crack initiation an

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13

Huh, Yong Hak, Philip Park, and Dong Jin Kim. "Behavior of Fatigue Crack around a Hole under Biaxial Loading: Effect of Biaxial Static Load." Key Engineering Materials 297-300 (November 2005): 1623–29. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.1623.

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Fatigue crack initiation and propagation behavior around a hole subjected to various biaxial fatigue loading modes has been investigated considering the effect of the biaxial static stress. Two different biaxial loading systems, i.e. cyclic tensile loading with static torsional load and cyclic torsional loading with static tensile load, were employed to thin-walled tubular specimens with a circular notch. Variation of the initiaiton and propagation directions of the crack around a hole under these loading ssytems was examined. The initiation directions were observed using replication technique

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14

Sharif-Khodaei, Z., P. M. Baiz, and M. H. Aliabadi. "Fatigue Crack Initiation and Propagation in Thick Multilayer Metallic Laminates." Key Engineering Materials 417-418 (October 2009): 929–32. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.929.

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The objective of this study is to investigate and develop a methodology to predict fatigue crack initiation and propagation in metallic laminate structures. The fatigue crack initiation is based on strain-life approach. After a crack has initiated, Stress Intensity Factors (SIF) are obtained and the subsequent propagation is described following Paris law type equations (NASGRO). Detailed Stress-Strain distribution in each layer is obtained from FE models, including the effect of the transition from flat to slant cracks on the fatigue crack growth.

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15

Messé, Olivier M. D. M., Joel Lachambre, Andrew King, Jean Yves Buffière, and Cathie M. F. Rae. "Investigation of Fatigue Crack Propagation in Nickel Superalloy Using Diffraction Contrast Tomography and Phase Contrast Tomography." Advanced Materials Research 891-892 (March 2014): 923–28. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.923.

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Evaluation of superalloy component life in turbine engines requires a detailed understanding of how fatigue crack initiation and short crack propagation contribute to fatigue life. However most investigations have been carried out post-mortem and in two dimensions. New techniques are able to fully resolve cracks propagating in four dimensions (space and time), enabling characterisation of their local environments and allowing a much deeper understanding of fatigue mechanics. Nickel-based superalloys experiencing high cycle fatigue have shown a high sensitivity to microstructure during initiati

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16

Sun, Xizhen, Fanbao Meng, Ce Zhang, Xucai Zhan, and He Jiang. "Progressive Failure and Acoustic Emission Characteristics of Red Sandstone with Different Geometry Parallel Cracks under Uniaxial Compression Loading." Advances in Materials Science and Engineering 2021 (March 11, 2021): 1–11. http://dx.doi.org/10.1155/2021/5569091.

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The geometric distribution of initial damages has a great influence on the strength and progressive failure characteristics of the fractured rock mass. Initial damages of the fractured rock were simplified as parallel cracks in different geometric distributions, and then, the progressive failure and acoustic emission (AE) characteristics of specimens under the uniaxial compression loading were analyzed. The red sandstone (brittle materials) specimens with the parallel preexisting cracks by water jet were used in the tests. The energy peak and stress attenuation induced by the energy release of

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17

Xue, Hongqian, Tao Gao, Zhidan Sun, and Xianjie Zhang. "Fatigue crack initiation and propagation of 100Cr6 steel under torsional loading in very high cycle regime." MATEC Web of Conferences 165 (2018): 20003. http://dx.doi.org/10.1051/matecconf/201816520003.

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Cyclic torsional fatigue properties of a high strength steel 100Cr6 are investigated using an ultrasonic torsional fatigue testing machine, and the results are compared with those obtained with fatigue tests under axial loading. Fatigue crack initiation and growth under torsion loading are observed in the very high cycle regime. Results show that fatigue cracks initiated from specimen surface as well as subsurface inclusions under torsion loading. However, subsurface MnS inclusions play a dominant role in crack initiation under torsion loading in the very high cycle regime. The initiation and

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18

Shen, Qingqing, Qiuhua Rao, Quan Zhang, Zhuo Li, Dongliang Sun, and Wei Yi. "A New Method for Predicting Double-Crack Propagation Trajectories of Brittle Rock." International Journal of Applied Mechanics 13, no. 02 (2021): 2150026. http://dx.doi.org/10.1142/s1758825121500265.

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Multi-crack propagation is investigated mainly by experimental measurement and little by theoretical prediction. The classical fracture criteria can better predict tensile fracture under arbitrary loading conditions (pure tensile, pure shear and mixed-mode), but have difficulty in predicting shear fracture. In this paper, Mode I and Mode II SIFs of branch-cracks initiated by the original cracks were calculated by the complex function and superposition method, and a new theory of multi-crack propagation was established based on the criterion of maximum tensile-shear SIF ratio. Theoretical resul

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19

Tian, Jing, Quan-Xin Shi, Li-Xin Meng, Jia-Fei Deng, Wei Liang, and Jin-Yao Ma. "Initiation and Suppression of Crack Propagation during Magnesium Alloy Rolling." Materials 14, no. 18 (2021): 5217. http://dx.doi.org/10.3390/ma14185217.

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The conventional rolling of magnesium alloy with a single pass and large reduction will cause severe edge cracking. The sheet without cracks can be achieved by limited width rolling. The microstructure evolution of the sheet with cracks after conventional rolling and the sheet without cracks after limited width rolling is explored, and an effective mechanism for solving edge cracks is proposed. Conventional rolling can fully develop twin evolution due to high deformation, and three stages of twinning evolution can be observed and the secondary twins easily become the nucleation points of micro

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20

Yamamoto, Yusuke, Mineo Asano, Hideo Yoshida, Masakazu Kobayashi, and Hiroyuki Toda. "Effect of Micro-Voids on Crack Initiation and Propagation in Bending Deformation of Al-Mg-Si Alloy Sheet." Materials Science Forum 794-796 (June 2014): 325–30. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.325.

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The crack initiation and propagation during bending have been considered to be affected by second phase particles, micro-voids and shear-bands. However, the effects of the second phase particles and the micro-voids on the crack initiation and propagation during bending have not been fully investigation. In this study, the effect of the second phase particle distribution on the formation of micro-voids, and the effect of the micro-voids on the crack initiation and propagation during bending were investigated using the largest synchrotron radiation facility “SPring-8” and FE-SEM/EBSD. With the b

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21

Uzan, Jacob. "Evaluation of Fatigue Cracking." Transportation Research Record: Journal of the Transportation Research Board 1570, no. 1 (1997): 89–95. http://dx.doi.org/10.3141/1570-11.

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The continuous growth of damage from fatigue cracking is described as a two-stage process of crack initiation and crack propagation. The crack-initiation stage can be characterized by conventional laboratory fatigue tests. The crack-propagation stage is described using the Paris-Erdogan phenomenological law. Problems encountered in implementing the theory are presented and discussed. For the sake of simplicity, only Mode II (shearing mode of the crack tip) is used. Computations of the stress-intensity factors and of the number of load repetitions for propagating the crack are presented. The ap

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22

Kocańda, Dorota, and Volodymyr Hutsaylyuk. "Analysing Micromechanisms of Initiation and Propagation of Short Fatigue Cracks from Rivet Holes in the Aluminums Sheets." Fatigue of Aircraft Structures 2009, no. 1 (2009): 84–101. http://dx.doi.org/10.2478/v10164-010-0009-7.

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Analysing Micromechanisms of Initiation and Propagation of Short Fatigue Cracks from Rivet Holes in the Aluminums SheetsResearched initiation and propagation of short surfaces fatigue cracks out of open in double-sided botch laminated sheet of aviation aluminum alloy 2024-T3 at stable amplitude one-sided bend (R=0.1). Research of the initial stage of development of cracks is realized by use of a SEM microscope, and it allowed to set the place of origin of crack and mikromechanisms of fracture of aluminum sheets, and also type of front of crack. Established a large enough scatter of velocity of

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23

Yang, Gaiyan, Liguang Zhu, Wei Chen, Gaoxiang Guo, and Baomin He. "Simulation of Crack Initiation and Propagation in the Crystals of a Beam Blank." Metals 8, no. 11 (2018): 905. http://dx.doi.org/10.3390/met8110905.

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Surface cracking seriously affects the quality of beam blanks in continuous casting. To study the mechanism of surface crack initiation and propagation under beam blank mesoscopic condition, this study established a polycrystalline model using MATLAB. Based on mesoscopic damage mechanics, a full implicit stress iterative algorithm was used to simulate the crack propagation and the stress and strain of pores and inclusions of the polycrystalline model using ABAQUS software. The results show that the stress at the crystal boundary is much higher than that in the crystal, cracks occur earlier in

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24

MORI, Takeshi, and Hideo TOKIDA. "Fatigue crack initiation and propagation from angled weld cracks." Doboku Gakkai Ronbunshu, no. 410 (1989): 149–56. http://dx.doi.org/10.2208/jscej.1989.410_149.

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25

Malik, L., L. N. Pussegoda, B. A. Graville, and W. R. Tyson. "Crack Arrest Toughness of a Heat-Affected Zone Containing Local Brittle Zones." Journal of Offshore Mechanics and Arctic Engineering 118, no. 4 (1996): 292–99. http://dx.doi.org/10.1115/1.2833918.

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The awareness of the presence of local brittle zones (LBZs) in the heat-affected zone (HAZ) of welds has led to the requirements for minimum initiation (CTOD) toughness for the HAZ for critical applications (API RP 2Z, CSA S473). Such an approach, however, is expensive to implement and limits the number of potential steel suppliers. A fracture control philosophy that is proposed to be an attractive alternative for heat-affected zones containing LBZs is the prevention of crack propagation rather than of crack initiation. Such an approach would be viable if it could be demonstrated that cracks i

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26

Zeng, Yan Ping, Shao Hua Li, and Ke Tong. "Micro-Behavior of Inclusions in X80 Pipeline Steel under Tensile Loading." Applied Mechanics and Materials 248 (December 2012): 224–30. http://dx.doi.org/10.4028/www.scientific.net/amm.248.224.

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Specially designed SEM in-situ tensile tests have been conducted to trace the entire process of crack initiation and propagation induced by inclusions in X80 pipeline steel. The main inclusions are complex oxides containing aluminum, calcium and magnesium with round or oval shape, and their sizes are in the range of 3~20μm. Cracks initiate firstly in inclusions and also easily initiate among inclusions if they distribute in the steel as an inclusion chain. The size of an inclusion has little effect on the initiation stress of the first crack, which mainly depends on the yield strength of the s

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27

Dong, Jianwei, Weichi Pei, Hongchao Ji, Haiyang Long, Xiaobin Fu, and Hailong Duan. "Fatigue crack propagation experiment and numerical simulation of 42CrMo steel." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 14 (2020): 2852–62. http://dx.doi.org/10.1177/0954406220910458.

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42CrMo steel is widely used in ultrahigh-strength structures such as low-speed heavy-duty gears. Mastering the fatigue crack propagation law has important significance for predicting structural fatigue life. Firstly, the fatigue crack propagation experiment is used to obtain the upper and lower thresholds value of type I fatigue crack propagation of 42CrMo steel compact tensile specimen under the alternating load of stress ratio R = 0.1. The Paris formula describing the relationship between the fatigue crack propagation rate and the crack tip stress intensity factor between the upper and lower

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28

Scott Martin, W., and Paul H. Wirsching. "Fatigue Crack Initiation—Propagation Reliability Model." Journal of Materials in Civil Engineering 3, no. 1 (1991): 1–18. http://dx.doi.org/10.1061/(asce)0899-1561(1991)3:1(1).

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29

Jeevan Kumar, N. "Dual cracks propagation behavior in hybrid skin–stiffener joint." International Journal of Computational Materials Science and Engineering 08, no. 03 (2019): 1950012. http://dx.doi.org/10.1142/s204768411950012x.

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There is increasing demand for Carbon Fiber Reinforced Polymers (CFRP) especially in aerospace engineering. Due to their high specific strength-to-weight ratio, these composites offer more characteristics and considerable advantages when compared to metals. Metals, unlike composites, offer plasticity effects to evade high stress concentrations during post-buckling. Under compressive load, composite structures show a wide range of damage mechanisms where a set of damage modes combined together may lead to the structural collapse. The numerical analysis is conducted to investigate the effect of

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30

Ottersböck, Markus J., Martin Leitner, Michael Stoschka, and Wilhelm Maurer. "Crack Initiation and Propagation Fatigue Life of Ultra High-Strength Steel Butt Joints." Applied Sciences 9, no. 21 (2019): 4590. http://dx.doi.org/10.3390/app9214590.

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The division of the total fatigue life into different stages such as crack initiation and propagation is an important issue in regard to an improved fatigue assessment especially for high-strength welded joints. The transition between these stages is fluent, whereas the threshold between the two phases is referred to as technical crack initiation. This work presents a procedure to track crack initiation and propagation during fatigue tests of ultra high-strength steel welded joints. The method utilizes digital image correlation to calculate a distortion field of the specimens’ surface enabling

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31

Liu, Yan Guo. "Investigation of Cleavage Fracture Behavior in Notched Specimens of a Low Alloy Hot Rolled Steel 16MnR." Advanced Materials Research 306-307 (August 2011): 523–30. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.523.

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The cleavage fracture behaviors are studied in notched specimens of a low alloy hot rolled steel 16MnR. The results show that two types of cleavage initiation sites are existed in notched specimens, one being related to the inclusions ahead of notch root (IC type) and the other related to inclusions located ahead of string cracks far from the notch root (SIC type). The types of initiation sites are influenced strongly on temperature, changing from IC type at -196°C to SIC type at -130°C. In both IC and SIC initiation mechanisms, the crack nucleation is induced by inclusions and the final fract

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32

de Salles, Lucio Salles, Lev Khazanovich, and José Tadeu Balbo. "Non-Destructive Evaluation of Crack Initiation and Propagation in Continuously Reinforced Concrete Pavements." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 3 (2019): 375–85. http://dx.doi.org/10.1177/0361198119833672.

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Transverse crack pattern significantly affects performance of continuously reinforced concrete pavement (CRCP). However, field and modeled crack spacing are based on visual surveys of fully developed transverse cracks visible on the slab surface. Because of the difficulties in detecting incipient cracks in concrete slabs, the effect that such cracks may have on CRCP performance is not currently considered. To address this issue, this paper presents a non-destructive evaluation methodology based on an ultrasonic linear-array system for detection of incipient cracks in CRCP slabs. Two ultrasonic

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Zhao, Guangming, Chongyan Liu, Cheng Pan, and Xiangrui Meng. "Researches on Crack Propagation of the Two Filled Noncoalescent Coplanar Flaws under the High Strain Rate Loading by means of AUTODYN-Based Simulation." Geofluids 2020 (November 24, 2020): 1–10. http://dx.doi.org/10.1155/2020/8875734.

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To study the influence of fillings on rock failure. By turning to the Drucker-Prager strength model and cumulative damage criteria, investigations are made, with the nonlinear AUTODYN software, into crack propagation behaviors in crack-filled and unfilled specimens under uniaxial dynamic loading. Under investigations are crack initiation position, sequence and angle, and coalescence mode. According to the mode of propagation and coalescence, cracks are divided into three types, i.e., the tensile wing, the antiwing, and the horsetail. The simulation results show that under uniaxial dynamic load

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34

Sun, Xiaoxiao, Xiaoming Guo, Li Guo, Baijian Wu, and Ying Wang. "Multiscale Analysis of Concrete Damage and Crack Propagation Under High Cycle Loading." International Journal of Computational Methods 17, no. 01 (2019): 1844007. http://dx.doi.org/10.1142/s0219876218440073.

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Concrete is a typical multiphase composite material in which the initiation and propagation of cracks under fatigue load are mainly determined by its mesoscopic structure. In this paper, a concrete multiphase mesoscopic model which considers thickness of interfacial transition zone (ITZ) varying with aggregate’s size is established by the integrated scripting method. The model comprehensively contains the stochastic characteristics of concrete mesoscopic structure. According to the fatigue crack propagation characteristics in different stages, a multiscale method is proposed by establishing th

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35

Li, Ran, W. Sun, Thomas H. Hyde, Edward J. Williams, and Xing Guo Wang. "Fatigue Crack Initiation and Propagation in SuperCMV Hollow Shafts with Transverse Holes." Applied Mechanics and Materials 70 (August 2011): 141–46. http://dx.doi.org/10.4028/www.scientific.net/amm.70.141.

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A fatigue crack growth test program has been carried out on hollow, SuperCMV shaft specimens, with transverse holes, under combined torsional and axial loading. The experimental results show that fatigue cracks always initiated in the stress concentration areas, i.e., in the transverse holes. Up to four cracks were observed to be initiated at different positions near the holes in the shafts. The fatigue crack propagation was initially found to occur under Mode I conditions, followed by a period of mixed Mode II/III crack growth. Three dimensional, finite element, elastic-plastic analyses have

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36

Tohgo, Keiichiro, Hiromitsu Suzuki, and Yoshinobu Shimamura. "Monte Carlo Simulation of Stress Corrosion Cracking in Structural Metal Materials Taking Account of Surface Crack Effects." Key Engineering Materials 353-358 (September 2007): 1068–71. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1068.

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According to laboratory accelerated test data, stress corrosion cracking (SCC) in structural metal materials occurs by initiation and coalescence of micro cracks, subcritical crack propagation and multiple large crack formation or final failure under the combination of materials, stress and corrosive environment. In this paper, a Monte Carlo simulation for the process of SCC has been proposed based on the stochastic properties of micro crack initiation and fracture mechanics concept for crack coalescence and propagation. The emphasis in the model is put on the influence of the semi-elliptical

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Zhao, Shijun, Qing Zhang, and Limin Liu. "Crack Initiation, Propagation, and Coalescence Experiments in Sandstone Brazilian Disks Containing Pre-Existing Flaws." Advances in Civil Engineering 2019 (January 22, 2019): 1–11. http://dx.doi.org/10.1155/2019/9816067.

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This study aims to investigate the fracture behaviors of cracks and crack systems in Brazilian disk (BD) sandstone specimens under compressive line loading. We conduct a series of rock fracture experiments to investigate crack initiation, propagation, and coalescence in samples with one or more pre-existing flaws under radial compressive stress. The displacements and failure loads of the tested specimens are measured. Experimental results show that there are two main types of cracks growing from the pre-existing flaws: wing cracks and secondary cracks. Both initiate mostly from the tips of the

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dos Santos e Lucato, S. L., D. C. Lupascu, and J. Rödel. "Crack initiation and crack propagation in partially electroded PZT." Journal of the European Ceramic Society 21, no. 10-11 (2001): 1425–28. http://dx.doi.org/10.1016/s0955-2219(01)00033-4.

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Bethge, K., D. Munz, and J. Neumann. "Crack initiation and crack propagation under thermal cyclic loading." High Temperature Technology 8, no. 2 (1990): 98–104. http://dx.doi.org/10.1080/02619180.1990.11753464.

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Zhu, Lei, Xu Teng Hu, Rong Jiang, Ying Dong Song, and Shou Dao Qu. "Initiation and Propagation Behaviors of Small Fatigue Crack in Titanium Alloy TC4." Key Engineering Materials 795 (March 2019): 9–14. http://dx.doi.org/10.4028/www.scientific.net/kem.795.9.

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The initiation and propagation behaviors of small fatigue crack in TC4 were investigated in the present work. Surface replication on the basis of a two-part silicon mixture and confocal laser scanning microscope were used to record and observe the small crack initiation and growth processes at room temperature in air. Results showed that surface cracks initiated from the interfaces between α and β phases. When the crack lengths were below ~200 μm, the crack growth rates exhibited large oscillations and temporary retardations due to the presence of α/β interfaces. The corner crack propagated mu

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Zhang, Zhi Zhen, Feng Gao, Yang Cui, and Xiao Ji Shang. "Study of Crack Initiation and Propagation in Rock under Coupled Static and Dynamic Loads." Applied Mechanics and Materials 99-100 (September 2011): 687–91. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.687.

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In order to research the crack initiation and propagation behavior in rock mass under coupled static and dynamic loads, the crack initiation angle and expansion angle formulas are set up by use of the fracture mechanics theory, then numerical simulation of crack propagation are conducted using software RFPA. The results show that: the crack always extend toward the dynamic stress direction; the bigger of the crack dip, the smaller of the crack initiation angle and the more difficulty of the crack initiation and propagation, meanwhile the less influence to the damage of rock. What’s more, when

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Xu, Chen, Herbert Danninger, Golta Khatibi, and Brigitte Weiss. "Gigacycle Fatigue Crack Initiation in Cr-Mo Prealloy Sintered Steel." Materials Science Forum 534-536 (January 2007): 685–88. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.685.

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Crack initiation and short crack propagation was studied on the polished notched surfaces of Cr-Mo prealloy sintered steels with 7.35 g.cm-3 sintered density. An ultrasonic resonance test system operating in push-pull mode at 20 kHz and R=-1 was used. It showed that crack initiation took place in several places, small cracks growing oriented to the local pore structure rather than to stress orientation. Their growth rate is markedly higher than the corresponding one of long cracks. Finally, several microcracks join to form a dominant crack.

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Zhou, Binpeng, Junrui Chai, Jing Wang, Heng Zhou, and Lifeng Wen. "An XFEM-Based Analysis of Concrete Face Cracking in Rockfill Dams." Mathematical Problems in Engineering 2021 (July 29, 2021): 1–12. http://dx.doi.org/10.1155/2021/6640668.

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The concrete face of a rockfill dam is a long and thin slab structure, which is highly susceptible to fracture when subjected to the settlement of the dam. The study of the generation and propagation of cracks in the concrete face of rockfill dams is of great significance to dam construction and face crack prevention. In this study, the initiation and propagation of cracks in the concrete face of a rockfill dam are investigated using an extended finite element method (XFEM) and ABAQUS software for the Gongboxia concrete-face rockfill dam. A numerical model for this dam is established using a f

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Huneau, Bertrand, Isaure Masquelier, Yann Marco, et al. "FATIGUE CRACK INITIATION IN A CARBON BLACK–FILLED NATURAL RUBBER." Rubber Chemistry and Technology 89, no. 1 (2016): 126–41. http://dx.doi.org/10.5254/rct.15.84809.

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ABSTRACT A detailed study of the initiation of fatigue cracks in carbon black–filled natural rubber is conducted. Interrupted fatigue tests are performed and fatigued samples are observed with a scanning electron microscope. This procedure first enables the quantification of the morphology, spatial distribution, and evolution of crack initiation sites for different strain levels, which gives some statistical data for each strain level. It also permits analysis of the chemical nature of inclusions inducing crack initiation thanks to energy dispersive spectrometry of X-rays. It is shown that fat

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Wolfrum, J., E. Quan, G. Maier, and S. Eibl. "Damage initiation of thermally degraded carbon composites in tension." Journal of Composite Materials 52, no. 24 (2018): 3399–409. http://dx.doi.org/10.1177/0021998318765928.

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This study focuses on exploring the initial failure of thermally degraded carbon fibre-reinforced polymers. It is the aim of this study to provide deep insight into the damage development and propagation as well as to understand failure mechanisms of thermally degraded composites. Carbon fibre-reinforced polymer panels with different fibre orientations are exposed to heat above maximum operational temperature (up to 200 ℃) for various durations (up to ca. 200 days). Thermal degradation of the material is characterized by scanning electron microscopy and infrared spectroscopy. The onset of the

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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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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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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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Choi, B. S., Chia Yen Lee, and Young Suck Chai. "Mixed Mode Effects on the Interfacial Crack Propagation." Key Engineering Materials 261-263 (April 2004): 357–62. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.357.

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Initiation and propagation of interfacial crack along bimaterial interface are considered in this study. A series of interfacial crack initiation and propagation experiments are conducted using the biaxial loading device for various mixed modes. Normal crack opening displacement (NCOD) is measured near crack front by a crack opening interferometry and used for extracting fracture parameters. From mixed mode interfacial crack initiation experiments, large increase in toughness with shear components is observed. Initial velocity of crack propagation is very dependent upon the mode-mixes. It incr

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Pande, Chandra S., and Ramasis Goswami. "Dislocation Emission and Crack Dislocation Interactions." Metals 10, no. 4 (2020): 473. http://dx.doi.org/10.3390/met10040473.

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An understanding of the crack initiation and crack growth in metals spanning the entire spectrum of conventional and advanced has long been a major scientific challenge. It is known that dislocations are involved both in the initiation and propagation of cracks in metals and alloys. In this review, we first describe the experimental observations of dislocation emission from cracks under stress. Then the role played by these dislocations in fatigue and fracture is considered at a fundamental level by considering the interactions of crack and dislocations emitted from the crack. We obtain precis

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