An investigation on the evolution of strain localization zone in metallic materials based on tensile tests and a 1-D nonlocal model

IF 1.5 4区 工程技术 Q3 MECHANICS
Wei Chen, Lizhi Xia, Yin Yao
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引用次数: 0

Abstract

Abstract Metallic materials exhibit pronounced strain localization during damage and failure, posing a challenge in damage mechanics when predicting the change in the size of the strain localization zone. In this study, uniaxial tensile tests were carried out to observe changes in the size of the strain localization zone during the loading of aluminum and low-carbon steel. The initial and final states of the two metallic materials during deformation localization were compared. The strain localization zone shrank gradually with the increase in the load, which agrees with existing electronic speckle pattern interferometry (ESPI) results. This experimental phenomenon was further analyzed theoretically. By establishing the relationship between the material characteristic length and the damage, the variation of the material characteristic length was revealed, and the form of the nonlocal kernel function with a varying characteristic length was determined. The results demonstrated that within the framework of nonlocal damage theory, the nonlocal kernel function with a varying characteristic length can be used to satisfactorily simulate the gradual shrinkage of the strain localization zone of metallic materials with the damage evolution. Therefore, this study provides an effective theoretical tool for predicting the size of the strain localization zone.
基于拉伸试验和一维非局部模型的金属材料应变局部化区演化研究
金属材料在损伤和失效过程中表现出明显的应变局部化,这对损伤力学中预测应变局部化区大小的变化提出了挑战。本研究通过单轴拉伸试验,观察铝和低碳钢加载过程中应变局部化区大小的变化。比较了两种金属材料在变形局部化过程中的初始状态和最终状态。随着载荷的增加,应变局部化区逐渐缩小,这与电子散斑干涉测量(ESPI)的结果一致。对这一实验现象进行了进一步的理论分析。通过建立材料特征长度与损伤之间的关系,揭示了材料特征长度的变化规律,确定了具有不同特征长度的非局部核函数的形式。结果表明,在非局部损伤理论框架下,采用变特征长度的非局部核函数可以较好地模拟金属材料应变局部化区随损伤演化的逐渐收缩。因此,本研究为预测应变局部化区大小提供了有效的理论工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Mechanics
Journal of Mechanics 物理-力学
CiteScore
3.20
自引率
11.80%
发文量
20
审稿时长
6 months
期刊介绍: The objective of the Journal of Mechanics is to provide an international forum to foster exchange of ideas among mechanics communities in different parts of world. The Journal of Mechanics publishes original research in all fields of theoretical and applied mechanics. The Journal especially welcomes papers that are related to recent technological advances. The contributions, which may be analytical, experimental or numerical, should be of significance to the progress of mechanics. Papers which are merely illustrations of established principles and procedures will generally not be accepted. Reports that are of technical interest are published as short articles. Review articles are published only by invitation.
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