In engineering structure, weak points may appear at a location with sudden changes of geometry, metallurgical discontinuities and non-uniform distribution of load after a certain period of service.

• 在工程结构中,几何突变、冶金不连续以及非均布载荷的作用都会导致结构损伤的局部化,能否识别出这些薄弱点对结构的延寿修复具有重要意义。