The ability to characterise residual stress distribution accurately and over different length scales, particularly deep into an engineering part, plays a significant role in assessing structural integrity. Two most commonly used techniques to measure residual stress fields deep into engineering components include neutron diffraction (ND) and deep‐hole drilling (DHD). As the measurements depend on several physical quantities, they are susceptible to error. The error or uncertainties may turn substantial and compromise the suitability of the results. Although noninvasive, the neutron diffraction technique is neither readily available nor portable and is limited to approximately 60‐mm‐thick specimen; errors associated with results become unacceptable at greater flight paths. Moreover, a mock‐up representing the engineering component is normally used in the ND technique. In contrast, the DHD technique is portable and measures residual stresses with high spatial resolution. An error propagation technique was applied to develop an error analysis procedure taking into consideration various stages of the DHD method and successfully applied to different DHD measurements. An essential feature comprising the effect of plasticity due to the creation of reference hole in the DHD procedure has not yet been taken into account in the error analysis procedure. This paper briefly describes how the uncertainties due to the creation of the initial reference hole can be determined. The effect of plasticity in the drilling procedure is quantified in this study. This error is combined with other sources of error and formulated to determine the total error. An incremental DHD technique was used to measure the complex triaxial residual stress field in an as‐welded circular disc, and the measured data were used to illustrate the total error using the error analysis method developed in the study.

中文翻译：

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半创残余应力测量方法中总不确定度分析的研究进展

准确表征残余应力分布并在不同长度范围内，特别是深入到工程部分的能力，在评估结构完整性方面起着重要作用。测量工程部件深处的残余应力场的两种最常用技术是中子衍射（ND）和深孔钻探（DHD）。由于测量取决于几个物理量，因此容易出错。错误或不确定性可能会变得很严重，并损害结果的适用性。中子衍射技术虽然是非侵入性的，但它既不容易获得，也不便于携带，并且仅限于约60毫米厚的标本。与结果相关的错误在更大的飞行航迹上变得无法接受。此外，ND技术通常使用代表工程组件的模型。相比之下，DHD技术是便携式的，可以以高空间分辨率测量残余应力。考虑到DHD方法的各个阶段，使用了一种错误传播技术来开发错误分析程序，并成功地将其应用于不同的DHD测量。在误差分析程序中尚未考虑到由于在DHD程序中由于创建参考孔而引起的可塑性影响的基本特征。本文简要描述了如何确定由于初始参考孔的产生而引起的不确定性。在这项研究中量化了塑性在钻孔过程中的影响。将此错误与其他错误源合并，并制定公式以确定总错误。使用增量DHD技术测量焊接圆盘中的复杂三轴残余应力场，并使用研究中开发的误差分析方法将测量数据用于说明总误差。