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Determination of multiple near-surface residual stress components in laser peened aluminium alloy via the contour method

机译:轮廓法测定激光喷丸铝合金中的多个近表面残余应力分量

摘要

In this study, residual stress fields, including the near-surface residual stresses, were determined for an Al7050-T7451 sample after laser peening. The contour method was applied to measure one component of the residual stress, and the relaxed stresses on the cut surfaces were then measured by X-ray diffraction. This allowed calculation of the three orthogonal stress components using the superposition principle. The near-surface results were validated with results from incremental hole drilling and conventional X-ray diffraction. The results demonstrate that multiple residual stress components can be determined using a combination of the contour method and another technique. If the measured stress components are congruent with the principal stress axes in the sample, then this allows for determination of the complete stress tensor.
机译:在这项研究中,确定了Al7050-T7451激光喷丸后的残余应力场,包括近表面残余应力。应用轮廓法测量残余应力的一个分量,然后通过X射线衍射测量切割表面的松弛应力。这样就可以使用叠加原理来计算三个正交应力分量。通过增量钻孔和常规X射线衍射的结果验证了近地表结果。结果表明,可以使用轮廓法和另一种技术的组合来确定多个残余应力分量。如果测得的应力分量与样本中的主应力轴一致,则可以确定完整的应力张量。

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