安徽大学学报（自然科学版）2016，Vol.40Issue(3)：50-57,8.DOI:10.3969/j.issn.1000-2162.2016.03.009
拉伸与疲劳载荷下α-Ti 中裂纹扩展机制的原子模拟
Atomistic simulation of failure mechanism for α-Ti with central crack under uniaxial tensile and fatigue loading
摘要
Abstract
In this paper , molecular dynamics simulation was performed to study the failure mechanism of the α‐Ti with centered pre‐crack defect under uniaxial tensile and fatigue loading . Three typical pre‐cracks with A(1‐210)[10‐10],B(0001)[1‐210] and C(1‐210) [0001] were chosen to simulate the effects of crack orientation on crack growth under these two loading .The deformation twinning was found in crack B ,at the same time the dislocation‐free zone around the crack tip was found under tensile loads .The results also indicated that dislocation emission in the base plane was easier than that in the cylindrical plane ,so the crack growth of orientation C stopped because the dislocation emits rapidly along its base plane releasing the crack tip stress under the fatigue loading .The results showed that the failure mechanism of α‐Ti with crack defect was a very complicated process with many interacting factors mixed together ,such as dislocation emission , carck growth ,deformation twin ,and so on .关键词
分子动力学/中心裂纹/α-Ti/拉伸/疲劳/LAMMPSKey words
molecular dynamics simulation/central crack/α-Ti/tension/fatigue/LAMMPS分类
数理科学引用本文复制引用
袁玉全,曾祥国,胡燕飞,朱彦..拉伸与疲劳载荷下α-Ti 中裂纹扩展机制的原子模拟[J].安徽大学学报（自然科学版）,2016,40(3):50-57,8.基金项目
国防重点基金资助项目（B1520132013-1）；四川理工学院科研项目（2015RC41，2015RC44，2012KY16）；四川省教育厅科研项目 （）
