Two-dimensional Mapping of Bulk Residual Stress Using Cut Mouth Opening Displacement
Two-dimensional Mapping of Bulk Residual Stress Using Cut Mouth Opening Displacement
复制标题
使用切割口张开位移进行体积残余应力的二维映射
DOI：
10.1007/s11340-021-00745-2
复制
发表时间：
2021
影响因子：
2.4
通讯作者：
Hill, M. R.
中科院分区：
文献类型：
--
作者：
Chighizola, C. R.;Hill, M. R.
背景以前的工作描述了一种绘制板状样品中双向残余应力的二维空间分布的方法，该方法将多次切分测量与弹性应力分析相结合。目的应用一种新的切口口张开位移(CMOD)而不是背面应变(BFS)的测量方法来扩展先前的工作。方法首先，通过实验验证CMOD切分的有效性：在递增的切分过程中，对同一样品同时测量BFS和CMOD；计算两种残余应力分布，一种由BFS数据计算，另一种由CMOD数据计算；并对两种残余应力分布进行比较。结果由BFS和CMOD数据分别计算得到的两种残余应力-深度分布曲线是一致的，在板材边界附近的压缩(-150 Mpa)和在板材中心附近的拉伸(100 Mpa)，两种应力分布之间的最大差值为25 Mpa，均方根为7.2 Mpa。重复的双向残余应力测量表明CMOD技术是可重复的，互补轮廓法测量表明该映射是有效的。还描述了切分过程中CMOD和BFS变形的各个方面，表明它们通常是互补的，但CMOD切分在狭窄的样品中是有利的。
BackgroundPrior work described an approach for mapping the two-dimensional spatial distribution of biaxial residual stress in plate-like samples, the approach combining multiple slitting measurements with elastic stress analysis.ObjectiveThis paper extends the prior work by applying a new variation of the slitting method that uses measurements of cut mouth opening displacement (CMOD) rather than back-face strain (BFS).MethodsFirst, CMOD slitting is validated using an experiment where: BFS and CMOD are measured simultaneously on the same sample during incremental slitting; two residual stress profiles are computed, one from the BFS data and a second from the CMOD data; and the two residual stress profiles are compared. Following validation, multiple adjacent CMOD slitting measurements are used to construct two-dimensional maps of residual stress in plates cut from quenched aluminum.ResultsThe two residual stress versus depth profiles, each computed separately from BFS or CMOD data, are in agreement, with compression near the plate boundaries (-150 MPa) and tension near the plate center (100 MPa); differences between the two stress profiles have a maximum of 25 MPa and a RMS of 7.2 MPa. Repeated biaxial residual stress mapping measurements show the CMOD technique is repeatable, and complementary contour method measurements show the mappings are valid. Aspects of CMOD and BFS deformations during slitting are also described and show they are generally complementary but that CMOD slitting is favorable in narrow samples.
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DOI：
10.1115/1.2400263
发表时间：
2007
影响因子：
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作者：
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DOI：
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期刊：
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影响因子：
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