Coupling effect of strain gradient strengthening and thermal softening on the microscale plastic behavior of metallic materials

doi:10.1016/j.euromechsol.2023.105117

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Coupling effect of strain gradient strengthening and thermal softening on the microscale plastic behavior of metallic materials
	Liu, Yanwei 3; Long, Hao 3; Zhang, Siyuan 2; Song JR(宋晶如)1; Zhou, Qianqian 3; Wei, Yueguang 3
刊名	EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
	2023-11-01
卷号	102 页码:16
关键词	Thermo-mechanical coupled Microscale plasticity model Plastic strain gradient Radial return method Staggered solution scheme
ISSN号	0997-7538
DOI	10.1016/j.euromechsol.2023.105117
通讯作者	Liu, Yanwei(yanwei-liu@pku.edu.cn)
英文摘要	Size effects and thermal effects together determine the microscale plastic response of metallic structures in highintegrated microelectromechanical systems (MEMS) at different temperatures. To investigate the microscale plastic behavior of metallic materials at different temperatures, a thermo-mechanical coupled microscale plasticity model is developed. In the mechanical part of this model, the framework of conventional plasticity theory is maintained, and the plastic strain gradient is introduced as an internal variable to increase the tangential hardening modulus without the introduction of higher-order stress and higher-order boundary conditions. The influence of temperature on the mechanical parameters (e.g. the yield strength) is calibrated by experiment results. In the thermal part of this model, the heat generation in the plastic deformation stage is calculated by the difference between the plastic work and the hardening stored energy influenced by the plastic strain gradient. Due to the strong nonlinearity of the coupled equations, a finite element solution algorithm that combines the radial return method and the staggered solution scheme is proposed. The effectiveness of this model and its solution algorithm is verified by comparisons with the experiment results and a numerical benchmark example. Finally, taking the tensile behavior of a plate with a hole in its center as an example, the coupling effect of strain gradient strengthening and thermal softening on the microscale plastic behavior of metallic materials is investigated. The results show that the microscale plastic behavior of metallic materials at high temperatures depends on the competition between thermal softening and strain gradient strengthening. Our study provides a theoretical basis and a reliable simulation method for the design of MEMS at different temperatures.
分类号	二类/Q1
资助项目	Postdoctoral Science Foundation of China for Innovative Talents[BX20220008] ; National Natural Science Foundation of China[12032001] ; National Natural Science Foundation of China[11521202] ; National Natural Science Foundation of China[12202007] ; National Natural Science Foundation of China[11890681]
WOS关键词	CRYSTAL PLASTICITY ; GRAIN-SIZE ; LATTICE INCOMPATIBILITY ; NANO-INDENTATION ; DEFORMATION ; SINGLE ; FRACTURE ; TEMPERATURE ; FORMULATION ; PRINCIPLES
WOS研究方向	Mechanics
语种	英语
WOS记录号	WOS:001068121600001
资助机构	Postdoctoral Science Foundation of China for Innovative Talents ; National Natural Science Foundation of China
其他责任者	Liu, Yanwei
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/92990]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.Univ Shanghai Sci & Technol, Sch Mech Engn, Shanghai 200093, Peoples R China; 3.Peking Univ, Coll Engn, Dept Mech & Engn Sci, BIC ESAT, Beijing 100871, Peoples R China;
推荐引用方式 GB/T 7714	Liu, Yanwei,Long, Hao,Zhang, Siyuan,et al. Coupling effect of strain gradient strengthening and thermal softening on the microscale plastic behavior of metallic materials[J]. EUROPEAN JOURNAL OF MECHANICS A-SOLIDS,2023,102:16.
APA	Liu, Yanwei,Long, Hao,Zhang, Siyuan,宋晶如,Zhou, Qianqian,&Wei, Yueguang.(2023).Coupling effect of strain gradient strengthening and thermal softening on the microscale plastic behavior of metallic materials.EUROPEAN JOURNAL OF MECHANICS A-SOLIDS,102,16.
MLA	Liu, Yanwei,et al."Coupling effect of strain gradient strengthening and thermal softening on the microscale plastic behavior of metallic materials".EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 102(2023):16.