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根据低频电磁场在导体中的集肤效应及基准模型中激励线圈相对较小的特点,将轴对称场与三维场相结合,建立了以裂纹形成的微扰场作为求解对象的微扰模型.为了进一步将微扰模型的有限元离散区域缩小,将矢量渐近边界条件引入到微扰模型中,且计算结果与实验结果符合得很好.
According to the skin effect of low-frequency electromagnetic field in the conductor and the relatively small excitation coil in the reference model, the perturbation field formed by the crack is established as the perturbation model of the object by combining the axisymmetric field with the three-dimensional field. The discrete region of the finite element of the perturbation model is further reduced, and the vector asymptotic boundary conditions are introduced into the perturbation model. The calculated results are in good agreement with the experimental results.