Measurement of Highly Non-Uniform Residual Stress Fields with Reduced Plastic Error
Measurement of Highly Non-Uniform Residual Stress Fields with Reduced Plastic Error
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测量高度不均匀的残余应力场并减少塑性误差
DOI：
10.1007/s11340-015-0025-1
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发表时间：
2015
影响因子：
2.4
通讯作者：
Kim H
中科院分区：
文献类型：
--
作者：
Kim H
最近提出的残余应力测量方法的实验验证。本文应用该方法测量了7075-T6铝合金棒材四点弯曲产生的残余应力。该方法的优点是，它可以重建应力场没有任何假设的面内均匀性。该方法使用两个切口，从两侧表面传播，并使用2D高分辨率数字图像相关（DIC）从侧表面收集全场松弛位移场。重建的残余应力与有限元模拟和中子衍射测量的结果吻合得很好。此外，它示出，诱导塑性应变在松弛过程中，这降低了该方法的准确性，是强烈影响的方向的传播的削减。这意味着，如果仔细选择切割的方向和扩展，则可以在切割期间显著减少塑性应变。
Experimental validations of a recently proposed method for residual stress measurement are presented. The method, specifically designed for highly non-uniform in-plane residual stress fields is applied in this work to measure the residual stresses resulting from four-point bend of an Aluminium 7075-T6 bar. The benefit of the method is that it can reconstruct stress fields without any assumptions of in-plane uniformity. The method uses two cuts, propagated from both side surfaces and collection of full-field relaxation displacement fields from side surfaces using 2D high-resolution digital image correlation (DIC). The reconstructed residual stress agrees well with that predicted by FE modelling and neutron diffraction measurement. In addition, it is shown that induced plastic strain during the relaxation process, which reduces accuracy of the method, is strongly influenced by the direction of the propagation of the cut. This implies that it is possible to reduce substantially plastic strain during cutting if the orientation and propagation of the cut is carefully chosen.
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DOI：
10.4028/www.scientific.net/amr.996.249
发表时间：
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期刊：
Advanced Materials Research
影响因子：
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