数字图像相关
材料科学
极限抗拉强度
本构方程
加工硬化
硬化(计算)
变形(气象学)
应变硬化指数
焊接
搅拌摩擦焊
拉伸试验
复合材料
铝
压力(语言学)
结构工程
冶金
微观结构
有限元法
工程类
语言学
哲学
图层(电子)
作者
C. Leitão,Ivan Galvão,Rui M. Leal,D.M. Rodrigues
出处
期刊:Materials in engineering
[Elsevier]
日期:2012-01-01
卷期号:33: 69-74
被引量:126
标识
DOI:10.1016/j.matdes.2011.07.009
摘要
In this paper a simple procedure for the characterization of the constitutive behaviour of welds is presented. Digital Image Correlation (DIC) is used for accessing local strain fields in transverse weld tensile samples and the stress distribution is calculated taking into account local strain data and thickness variation across the samples. The constitutive behaviour of the welds is assessed from local tensile stress–strain curves, plotted up to moderate values of plastic deformation, by fitting an appropriate work-hardening model to the experimental results and the ultimate tensile strength of the welds is estimated using the Considère criterion. Based on this information it is possible to assess the constitutive behaviour of different weld sub-zones, which cannot be derived from the hardness measurements, as well as evaluating the mis-match in yield stress and plastic properties across the welds. The proposed methodology is validated by comparing local stress–strain curves obtained by testing transverse weld samples of friction stir welds in very thin plates with those obtained by testing longitudinal samples of the same welds.
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