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Particle Discontinuous Deformation Analysis of Static and Dynamic crack Propagation in Brittle Material

Computer Modeling in Engineering & Sciences 2024年第5期139卷 2215-2236页

作者： Zediao Chen Feng Liu State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin300072China

crack propagation in brittle material is not only crucial for structural safety evaluation,but also has a wideranging impact on material design,damage assessment,resource extraction,and scientific research.A thorough investigation into the behavior of crack propagation contributes to a better understanding and control of the properties of brittle materials,thereby enhancing the reliability and safety of both materials and structures.As an implicit discrete elementmethod,the Discontinuous Deformation Analysis(DDA)has gained significant attention for its developments and applications in recent years.Among these developments,the particle DDA equipped with the bonded particle model is a powerful tool for predicting the whole process of material from continuity to failure.The primary objective of this research is to develop and utilize the particle DDAtomodel and understand the complex behavior of cracks in brittle materials under both static and dynamic loadings.The particle DDA is applied to several classical crack propagation problems,including the crack branching,compact tensile test,Kalthoff impact experiment,and tensile test of a rectangular plate with a hole.The evolutions of cracks under various stress or geometrical conditions are carefully investigated.The simulated results are compared with the experiments and other numerical results.It is found that the crack propagation patterns,including crack branching and the formation of secondary cracks,can be well reproduced.The results show that the particle DDA is a qualified method for crack propagation problems,providing valuable insights into the fracture mechanism of brittle materials.

关键词： Discontinuous deformation analysis particle DDA crack propagation crack branching brittle materials

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Dynamic crack propagation in plates weakened by nclined cracks:an investigation based on peridynamics

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Frontiers of Structural and Civil Engineering 2018年第4期12卷 527-535页

作者： A.SHAFIEI Department of Mechanical Engineering Yazd UniversityIran Institute of Structural Mechanics Bauhaus UniversityWeimarGermany

Peridynamics is a theory in solid mechanics that uses integral equations instead of partial differential equations as governing equations. It can be applied to fracture problems in contrast to the approach of fracture mechanics. In this paper by using peridynamics, the crack path for inclined crack under dynamic loading were investigated. The peridynamics solution for this problem represents the main features of dynamic crack propagation such as crack bifurcation. The problem is solved for various angles and different stress values. In addition, the influence of geometry on inclined crack growth is studied. The results are compared with molecular dynamic solutions that seem to show reasonable agreement in branching position and time.

关键词： peridynamics inclined crack dynamic fracture crack branching

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Effects of metallic microstructures on fatigue fracture of Q345 steel

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Journal of Iron and Steel Research(International) 2020年第6期27卷 702-709页

作者： Han-qing Liu Chun-ming Wang Hong Zhang Zhi-yong Huang Qing-yuan Wang Qiang Chen School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065SichuanChina Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province Sichuan UniversityChengdu 610065SichuanChina Department of Mechanical Engineering Kyushu UniversityFukuoka 819-0395Japan School of Materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000JiangxiChina

Effects of high-frequency cyclic loading on the banded ferrite-pearlite steel were analyzed through crack initiation and propagation. Interfaces of ferrite and pearlite colony with a small angle deviation from the loading axis were verified to be the most potential sites to fabricate the microcracks caused by the high strain gradient. The initial crack extension inside ferrite grain was driven by shear stress in model II along the direction with a 45° angle to the loading axis. Banded pearlite colony and the high-angle grain boundaries were considered as the dominant factors that promote the fatigue resistance of the material through arousing crack deflection in short crack propagation range and crack branching in long crack propagation range to reduce the crack propagation driving force in the crack tip. P-S-N curves were used to quantify the dispersion of fatigue lifetimes and evaluate the effect of elevated volume content of pearlite colony on the fatigue performance of the material.

关键词： Ferrite-pearlite steel High-cycle fatigue crack propagation crack branching High-angle grain boundary P-S-N curve

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温度对钠钙玻璃板在双向弯曲试验中裂纹分叉的影响

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哈尔滨工业大学学报 1992年第1期 111-113页

作者：施平哈尔滨工业大学工程力学系

Fracture in glass and ceramic materials occurs from defects like machining or mechanically produced cracks, pores, and inclusions. Although actual defects are not necessarily regular in shape, they usually can be idealized by macro-cracks. Fractographic analysis of glass and ceramic materials has played an importantrole in our understanding of the mechanisms of failure of these materials. The real power of fracture surface analysis is in utilizing the fracture boundaries that form outside the flaw to describe fracture behavior, regardless of the flaw shape. It has been found that each of the mirror dimensions, R;（mirror/mist） and R

关键词： crack branching branching constant

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