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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses
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Integral method coefficients for the ring-core technique to evaluate non-uniform residual stresses

机译：环核技术用于评估非均匀残余应力的积分方法系数

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摘要

The ring-core technique allows for the determination of non-uniform residual stresses from the surface up to relatively higher depths as compared to the hole-drilling technique. The integral method, which is usually applied to hole-drilling, can also be used for elaborating the results of the ring-core test since these two experimental techniques share the axisymmetric geometry and the 0 degrees-45 degrees-90 degrees layout of the strain gage rosette. The aim of this article is to provide accurate coefficients which can be used for evaluating the residual stress distribution by the ring-core integral method. The coefficients have been obtained by elaborating the results of a very refined plane harmonic axisymmetric finite element model and verified with an independent three-dimensional model. The coefficients for small depth steps were initially provided, and then the values for multiple integer step depths were also derived by manipulating the high-resolution coefficient matrices, thus showing how the present results can be practically used for obtaining the residual stresses according to different depth sequences, even non-uniform. This analysis also allowed the evaluation of the eccentricity effect which turned out to be negligible due to the symmetry of the problem. An applicative example was reported in which the input of the experimentally measured relaxed strains was elaborated with different depth resolutions, and the obtained residual stress distributions were compared.
机译：与钻孔技术相比，环芯技术可以确定从表面直至相对较高深度的不均匀残余应力。由于这两种实验技术共享轴对称几何形状以及应变的0度-45度-90度布局，因此通常用于钻孔的积分方法也可以用于阐述环芯测试的结果。量规玫瑰。本文的目的是提供准确的系数，该系数可用于通过环芯积分法评估残余应力分布。通过阐述非常精细的平面谐波轴对称有限元模型的结果获得系数，并通过独立的三维模型进行验证。首先提供了小深度步长的系数，然后通过操纵高分辨率系数矩阵来得出多个整数步长深度的值，从而显示了如何将本结果实际用于获得根据不同深度的残余应力序列，甚至不一致。该分析还允许评估偏心效果，由于问题的对称性，偏心效果可以忽略不计。报告了一个应用示例，其中以不同的深度分辨率精心制作了实验测量的松弛应变的输入，并对获得的残余应力分布进行了比较。

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