Experimental Measurement of the Stress Gradient in a Bent Sheet

Audrie Corral, Eric Colllie, Zhaojun Lu, Grayson Womble, Chester J. Van Tyne
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Abstract

Stress gradients were experimentally measured in a 316 stainless steel sheet after bending with a press brake. Two different tool radii and three different bend angles were used to produce plastically bent sheets. Microhardness tests were performed across the thickness of the bent sheet, and a correlation between microhardness and strength was experimentally determined and was used to obtain the stress gradient. The position of the experimentally determined neutral plane correlated well with theory. Theoretical calculations of the stress gradient were made using a power law constitutive equation along with a simple mechanics analysis of plastic bending. Four of the six bending experimental conditions had reasonable correlation with the theoretical calculations. Ideas for improving this experimental method are discussed.
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弯曲板材应力梯度的实验测量
实验测量了用压力制动器弯曲 316 不锈钢板后的应力梯度。使用了两种不同的工具半径和三种不同的弯曲角度来生产塑性弯曲板材。对弯曲板材的整个厚度进行了显微硬度测试,通过实验确定了显微硬度和强度之间的相关性,并利用该相关性获得了应力梯度。实验确定的中性面位置与理论相关性良好。应力梯度的理论计算采用了幂律构成方程和塑性弯曲的简单力学分析。在六种弯曲实验条件中,有四种与理论计算结果具有合理的相关性。讨论了改进这种实验方法的思路。
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