Error analysis of 3D shearography using finite-element modelling
Error analysis of 3D shearography using finite-element modelling
复制标题
使用有限元建模进行 3D 剪切散斑分析的误差分析
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Groves
中科院分区：
文献类型：
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作者：
D. Goto;R. Groves
本文描述了完整的剪切散斑干涉系统的光机械模拟的开发，包括剪切散斑干涉仪、样品和测试环境。该模拟应用于工程样品中 3D 应变的测量。样品是承受内压的圆柱体和承受轴向载荷的平板。有限元模型用于获得位移场。使用光学模型模拟了由激光器和四个相机组成的 3D 剪切散斑仪。结合有限元和光学模拟可以生成相位图，这是使用完整测试设置进行测量的预测。由于样品材料特性、加载不准确和尺寸公差而产生的误差都包含在模型中，这使得可以在最小和最大误差限制下计算相图。通过路径长度的模拟和通过反剪切散斑处理的模拟提供了相似的结果，并且差异与灵敏度矢量引入的近似相关。
This paper describes the development of an opto-mechanical simulation of a complete shearography system, including the shearography instrument, the samples and the test environment. This simulation is applied to the measurement of 3D strains in engineering samples. The samples are a cylinder loaded by internal pressure and a flat plate under axial load. Finite elements models are used to obtain the displacements fields. A 3D shearography instrument consisting of a laser and four cameras has been simulated using the optical model. Combining the finite elements and optical simulations allows phase maps to be generated, which are the predictions for measurements using the complete test setup. Errors due to sample material properties, loading inaccuracy and dimensional tolerances are included in the model and this allows the calculation of phase maps at the minimum and maximum error limits. The simulation through path lengths and the simulation by inverted shearography processing provide similar results and the difference is associated with the approximation introduced by the sensitivity vector.