Recent Advancements in the Hole-Drilling Strain-Gage Method for Determining Residual Stresses

New Challenges in Residual Stress Measurements and Evaluation Pub Date : 2019-12-13 DOI:10.5772/intechopen.90392

E. Valentini, L. Bertelli, A. Benincasa, S. Gulisano

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Abstract

The hole-drilling Strain-Gage method is a widely used and cost-effective technique for the evaluation of residual stresses. The test method is standardized by ASTM E837-13a, which defines the scope, measurement range, minimum requirements of instrumentation, test procedure, and algorithms and coefficients for the computation of uniform and non-uniform stress distribution. However, the standardized test method presents some limitations regarding the scope and measurement range; moreover, some typical errors involved in the measurements are not taken into account, i.e., errors due to the hole eccentricity, the local plasticity, the intermediate thickness, and the hole-bottom chamfer, which can affect the results in some cases. Also, the standard does not provide the user with a complete guide regarding the evaluation of the uncertainty connected with this type of measurement. The paper presents a more general approach that allows the correction of some errors and overcomes and some limitations of the ASTM E837-13a test method, contributing to greater accuracy of the test results.

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测定残余应力的钻孔应变计法的最新进展

钻孔应变计法是一种广泛使用且经济有效的残余应力评估方法。测试方法由ASTM E837-13a标准化，它定义了范围，测量范围，仪器的最低要求，测试程序以及计算均匀和非均匀应力分布的算法和系数。然而，标准化测试方法在范围和测量范围方面存在一定的局限性;此外，测量中涉及的一些典型误差没有考虑在内，即孔偏心、局部塑性、中间厚度和孔底倒角引起的误差，这些误差在某些情况下会影响结果。此外，该标准没有为用户提供关于与此类测量相关的不确定度评估的完整指南。本文提出了一种更通用的方法，可以纠正ASTM E837-13a测试方法的一些错误，克服了ASTM E837-13a测试方法的一些局限性，有助于提高测试结果的准确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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New Challenges in Residual Stress Measurements and Evaluation

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