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Influence of dislocation pile-up on Main Crack Propagation in Nanocrystals in the Hydrogen Environment

Acta Mechanica Solida Sinica 2023年第6期36卷 851-859页

作者： Jiding Zhang Yue Sheng Hongda Yang Jinbo Wu Xiaoyu Jiang Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Aerospace EngineeringSouthwest Jiaotong UniversityChengdu 610031China

The influence of material micro-defects on the main crack growth under pure shear loading is studied *** mechanism behind the initiation of micro-cracks and crack propagation induced by dislocation accumulation near the grain boundary(GB)ismainly considered,and the influence of dislocation accumulation on the main crack propagation is *** research results reveal that the initiation of micro-cracks near the GB is prior to the propagation of the main *** a hydrogen environment,hydrogen can cause serious embrittlement of the crack tip and promote crack *** energy release rate in the main crack growth direction in the dislocation emission direction is the ***,the main crack will eventually merge with the micro-cracks at the GB along the direction of the slip band,resulting in fracture of the crystal *** research presented in this paper provides some new information for the first stage of crack propagation and contributes to the analysis of the mechanism of crystal metal fracture.

关键词： Crack propagation dislocation emission dislocation pile-up Grain boundary Energy release rate

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A model of crack based on dislocations in smectic A liquid crystals

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Chinese Physics B 2014年第10期23卷 369-372页

作者：范天佑唐志毅 School of Physics Beijing Institute of Technology

A plastic crack model for smectic A liquid crystals under longitudinal shear is suggested. The solution of the screw dislocation in smectic A is the key to the correct result that we obtained by overcoming a longstanding puzzle. We further use the dislocation pile-up principle and the singular integral equation method to construct the solution of the crack in the phase. From the solution, we can determine the size of the plastic zone at the crack tip and the crack tip opening （tearing） displacement, which are the parameters relevant to the local stability/instability of materials. Our results may be useful for developing soft-matter mechanics.

关键词： smectic A screw dislocation dislocation pile-up plastic crack local instability

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Structural transformation and energy analysis for pile-up dislocations at triple junction of grain boundary

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Transactions of Nonferrous Metals Society of China 2022年第1期32卷 45-63页

作者： Ying-jun GAO Zong-ji HUANG Qian-qian DENG Kun LIAO Yi-xuan LI Xiao-Ai YI Zhi-rong LUO Guangxi Key Laboratory of Advanced Energy Materials Guangxi Key Laboratory for the Relativistic AstrophysicsSchool of Physics Science and EngineeringGuangxi UniversityNanning 530004China School of Physics and Telecommunication Engineering Yulin Normal UniversityYulin 537000China

An energy model for the structure transformation of pile-ups of grain boundary dislocations(GBD)at the triple-junction of the grain boundary of ultrafine-grain materials was *** energy of the pile-up of the GBD in the system was calculated by the energy model,the critical geometric and mechanical conditions for the structure transformation of head dislocation of the pile-up were analyzed,and the influence of the number density of the dislocations and the angle between Burgers vectors of two decomposed dislocations on the transformation mode of head dislocation was *** results show when the GBD is accumulated at triple junction,the head dislocation of the GBD is decomposed into two Burgers vectors of these dislocations unless the angle between the two vectors is less than 90°,and the increase of applied external stress can reduce the energy barrier of the dislocation *** mechanism that the ultrafine-grained metal material has both high strength and plasticity owing to the structure transformation of the pile-up of the GBD at the triple junction of the grain boundary is revealed.

关键词： triple junction of grain boundary dislocation pile-up dislocation structural transformation energy model for pile-up ultrafine-grain materials

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