个人信息Personal Information
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
报考该导师研究生的方式
欢迎你报考张旭老师的研究生，报考有以下方式：
1、参加西南交通大学暑期夏令营活动，提交导师意向时，选择张旭老师，你的所有申请信息将发送给张旭老师，老师看到后将和你取得联系，点击此处参加夏令营活动
2、如果你能获得所在学校的推免生资格，欢迎通过推免方式申请张旭老师研究生，可以通过系统的推免生预报名系统提交申请，并选择意向导师为张旭老师，老师看到信息后将和你取得联系，点击此处推免生预报名
3、参加全国硕士研究生统一招生考试报考张旭老师招收的专业和方向，进入复试后提交导师意向时选择张旭老师。
4、如果你有兴趣攻读张旭老师博士研究生，可以通过申请考核或者统一招考等方式报考该导师博士研究生。
2018-09-18 陆晓翀（博士生）的论文“Dislocation mechanism based size-dependent crystal plasticity modeling and simulation of gradient nano-grained copper”在期刊 International Journal of Plasticity 上在线发表。
Highlights
•Dislocation mechanism based size-dependent crystal plasticity model is developed for gradient nano-grained (GNG) material.
•The complex gradient microstructure of GNG material is simplified by an iso-strain homogenization scheme.
•Grain growth of nanocrystals in GNG material help relieve the surface hollow/neck and benefit the ductility.
•Microstructure manipulation shows the same inverse linear strength-ductility relationship as observed experimentally.
Abstract
Overcoming the trade-off between strength and ductility in metallic materials is a grand challenge. Recently, materials with a gradient nano-grained (GNG) surface layer adhering to a ductile coarse-grained (CG) substrate have been proposed to overcome this long-standing dilemma. Constitutive modeling and simulation are crucial to understand the deformation mechanisms controlling the strength and ductility in GNG/CG materials, and to enable theory to guide microstructure optimization for upscaling. Here, we develop a dislocation mechanism based size-dependent crystal plasticity model, where multiple dislocation evolution mechanisms are considered. Furthermore, damage evolution and mechanically driven grain growth during the deformation of GNG/CG materials are incorporated into the constitutive model to study the role of microstructure gradient in the overall plastic response. The developed size-dependent constitutive model was implemented within a finite-strain crystal plasticity finite element framework, and used to predict the tensile mechanical behavior of GNG/CG copper, including yield stress, strain-hardening and ductility with a highly simplified geometrical representation of the microstructure. The simulations reveal some of the underlying deformation mechanisms controlling ductility and strengthening in terms of the spatial distribution and temporal evolution of microstructure and damage. The model was also used to demonstrate optimization of strength and ductility of GNG/CG copper. By manipulating the thickness of the GNG layer and the grain size of the CG substrate, the strength increase is associated with a loss of ductility showing the same linear inverse relationship observed experimentally for GNG/CG copper, which indicates the improvement over the typical nonlinear trade-off between strength and ductility.
Link
https://doi.org/10.1016/j.ijplas.2018.09.007