Multiple mechanism based constitutive modeling of gradient nanograined material
文献类型：期刊论文
| 作者 | Zhao JF4; Lu XC4; Yuan FP(袁福平)2,3 ; Kan QH4; Qu SX1; Kang GZ4; Zhang X4
|
| 刊名 | INTERNATIONAL JOURNAL OF PLASTICITY
 |
| 出版日期 | 2020-02-01 |
| 卷号 | 125页码:314-330 |
| 关键词 | Gradient nano-grained materials Geometrically necessary dislocations Back stress Deformation mechanism Constitutive model |
| ISSN号 | 0749-6419 |
| DOI | 10.1016/j.ijplas.2019.09.018 |
| 通讯作者 | Zhang, Xu(xzhang@swjtu.edu.cn) |
| 英文摘要 | Gradient nano-grained (GNG) materials, inside which grain size increases gradually from nanoscale in the surface to micro-scale in the substrate, have shown synergetic strength and ductility. The extra strain hardening of GNG materials is considered to result from both geometrically necessary dislocations (GNDs) accommodating nonuniform plastic deformation and superior kinematic hardening characterized by back stress. However, few quantitative investigations were performed to evaluate the contribution of various strengthening mechanisms to the mechanical response of GNG materials. In this work, we develop a multiple-mechanism-based constitutive model, in which constitutive laws for GNDs and back stress at both grain level and sample level are established. Microstructure-based finite element simulation successfully predicts the uniaxial tensile behavior of a GNG interstitial-free (IF) steel sheet. The simulation results demonstrate that GNDs and back stress at sample level have little influence on the strengthening of the GNG IF-steel, while the back stress induced by pileup GNDs contributes about 35% to the flow stress. The uniform elongation of the GNG sample is improved by the constraint of coarsegrained core on GNG layer. This work helps to understand the contributions of deformation mechanisms to the synergetic strength and ductility of GNG materials and to guide the microstructure design and optimization for improved strength-ductility combination. |
| 分类号 | 一类 |
| WOS关键词 | CRYSTAL PLASTICITY MODEL ; GRAIN-SIZE ; BACK STRESS ; FATIGUE RESISTANCE ; ELASTIC-MODULUS ; STRAIN ; DEFORMATION ; STRENGTH ; DUCTILITY ; BEHAVIOR |
| 资助项目 | National Natural Science Foundation of China[11672251] ; National Natural Science Foundation of China[11872321] ; Opening Fund of State Key Laboratory of Nonlinear Mechanics |
| WOS研究方向 | Engineering ; Materials Science ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:000510976700017 |
| 资助机构 | National Natural Science Foundation of China ; Opening Fund of State Key Laboratory of Nonlinear Mechanics |
| 其他责任者 | Zhang, Xu |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/81517]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Zhejiang Univ, Dept Engn Mech, Key Lab Soft Machines & Smart Devices Zhejiang Pr, Hangzhou 310027, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China; 4.Southwest Jiaotong Univ, Sch Mech & Engn, Appl Mech & Struct Safety Key Lab Sichuan Prov, Chengdu 610031, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Zhao JF,Lu XC,Yuan FP,et al. Multiple mechanism based constitutive modeling of gradient nanograined material[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2020,125:314-330. |
| APA | Zhao JF.,Lu XC.,袁福平.,Kan QH.,Qu SX.,...&Zhang X.(2020).Multiple mechanism based constitutive modeling of gradient nanograined material.INTERNATIONAL JOURNAL OF PLASTICITY,125,314-330. |
| MLA | Zhao JF,et al."Multiple mechanism based constitutive modeling of gradient nanograined material".INTERNATIONAL JOURNAL OF PLASTICITY 125(2020):314-330. |
入库方式： OAI收割
来源：力学研究所
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