材料早期损伤多表现为其内部结构微观或细观性的变化,不易被识别,却对结构宏观力学行为和使用寿命有重大影响。材料早期微损伤与声学非线性强度关系密切,应用非线性声学特征和参数能有效检测评估材料早期损伤状态,但其定量化研究需要进一步展开。 The early damage of the material is mostly manifested as microscopic or microscopic change of its internal structure, which is not easy to be identified. However, it has a significant influence on the macroscopic mechanical behavior and service life of the structure. The early damage of materials is closely related to the acoustics nonlinearity. The application of nonlinear acoustic characteristics and parameters can effectively detect and evaluate the early damage state of materials, but the quantitative study needs to be further developed.