Background: While the contour method for residual stress assessment has developed rapidly, no published study documents its interlaboratory reproducibility. Objective: Here we report an initial reproducibility experiment focused on contour method data analysis and residual stress calculation. Methods: The experiment uses surface topography data from a physical process simulation of elastic-plastic beam bending. The simulation provides surface topography, for input to the contour method data analysis, as well as a known residual stress field with 130 MPa peak magnitude. To increase realism, noise and specific artifacts are added to the topography data. A group of participants received the topography data (without the known residual stress), independently analyzed the data, and submitted results as a two-dimensional residual stress field. Results: Analysis of submissions provides a group average residual stress field and the spatial distribution of reproducibility standard deviation. The group average residual stress agrees with the known stress in magnitude and spatial trend. The reproducibility standard deviation ranges from 2 to 54 MPa over the measurement plane, with an average of 5.4 MPa. Reproducibility standard deviation is smaller in the cross-section interior (≤ 5 MPa), modest near local extrema in the stress field (5 to 10 MPa), and larger near the cross-section boundaries (10 to 30 MPa). The largest values of reproducibility standard deviation (up to 54 MPa) occur in limited areas where artifacts had been added to the topography data; while some participants identified and removed these artifacts, some did not, leading to systematic differences that elevated the standard deviation.

中文翻译：

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轮廓法数据分析和残余应力计算的实验室间重现性

背景：虽然残余应力评估的轮廓方法发展迅速，但没有公开的研究证明其实验室间可重复性。目标：在这里，我们报告了一个专注于等高线法数据分析和残余应力计算的初始再现性实验。方法：该实验使用来自弹塑性梁弯曲物理过程模拟的表面形貌数据。模拟提供了表面形貌，用于轮廓方法数据分析的输入，以及具有 130 MPa 峰值幅度的已知残余应力场。为了增加真实感，将噪声和特定的伪影添加到地形数据中。一组参与者收到地形数据（没有已知的残余应力），独立分析数据，并将结果作为二维残余应力场提交。结果：提交的分析提供了一组平均残余应力场和再现性标准偏差的空间分布。组平均残余应力在大小和空间趋势上与已知应力一致。测量平面上的重现性标准偏差范围为 2 到 54 MPa，平均值为 5.4 MPa。再现性标准偏差在横截面内部较小（≤ 5 MPa），在应力场中局部极值附近（5 至 10 MPa）适中，而在横截面边界附近（10 至 30 MPa）较大。再现性标准偏差的最大值（高达 54 MPa）出现在地形数据中添加了伪影的有限区域；虽然一些参与者识别并删除了这些文物，但有些没有，