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学历：博士研究生毕业
学位：工学博士学位
性别：男
学科：力学. 航空宇航科学与技术. 材料科学与工程. 机械工程. 冶金工程. 先进制造. 航空工程. 材料工程. 冶金工程. 机械工程. 固体力学
多尺度与微纳米力学，梯度结构材料，界面力学，固体本构关系，应变梯度理论，晶体塑性有限元，离散位错动力学，分子动力学，高熵合金，大数据与机器学习，材料基因，极端力学，高性能材料
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2022-10-18 合作论文“A peridynamic approach to solving general discrete dislocation dynamics problems in plasticity and fracture: Part II. applications”在International Journal of Plasticity发表
Highlights
•New peridynamic model for dislocation-based elastoplastic deformation and fracture.
•Model allows autonomous interactions between dislocations and crack growth.
•Simulates elastoplastic fracture without a preset cracking path or a cohesive zone model.
•Obtained crack path for Mode I elastoplastic fracture in single crystal is smooth and undulating, as observed in experiments.
•Ductile-to-brittle transition happens naturally in the model.
Abstract
In Part II of this work we extend the method introduced in Part I to consider dislocation dynamic evolution through dislocations nucleation, glide, pile-up, and annihilation. The SP DDD-PD scheme is employed to investigate uniaxial tension in a single crystal and a polycrystal and verify its accuracy. The model is then used to simulate elastoplastic fracture by considering interactions between dislocations and crack growth. For Mode I elastoplastic fracture in a single crystal, we observe that the crack path is “attracted” towards regions of high density of gliding dislocations, leading to an undulating crack paths, as observed in experiments but never replicated by continuum-level computational models before. Tests on different sample sizes show how the proximity of constraints to the crack tip can lead to plastic hardening. Ductile-to-brittle transition happens naturally in this model when the crack, under Mode I displacement-controlled loading, approaches a free edge. A new way to calibrate the critical bond strain based on the material toughness or fracture energy is proposed. The present SP DDD-PD scheme can be used to investigate complicated elastoplastic fracture problems in which the interaction between dislocation motion and damage is critical.
Link
https://doi.org/10.1016/j.ijplas.2022.103462