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利用激光反射衍射谱面光强随疲劳损伤试样表面逐步粗糙化而变化的原理，用一种非接触、非破坏的间接疲劳损伤检测方法，对３０ＣｒＭｎＳｉＡ材料轴线平行于轧制方向（Ｌ）和垂直于轧制方向（Ｔ）两种不同试样进行拉——拉非对称循环疲劳损伤检测，证明谱面光强比Ｋ对疲劳损伤是敏感的；损伤变量Ｄ（Ｋ）和疲劳循环次数Ｎ的关系曲线大致可以分为疲劳损伤的减速、线性和加速损失区，从而对材料进行疲劳损伤检测并对其疲劳寿命进行估计；同时对扫描电镜图像分析得出衍射光强比变化所对应的疲劳损伤细观机理。
By using the principle of non-contact and non-destructive indirect fatigue damage detection based on the principle that the light intensity of laser reflection diffraction spectrum changes gradually with the fatigue damage specimen surface, the axial direction of 30CrMnSiA material is parallel to the rolling direction (L) and Tensile tests show that the spectral intensity ratio K is sensitive to fatigue damage. The damage variable D (K) and the number of fatigue cycles N The relationship curves can be roughly divided into deceleration, linear and acceleration loss zones of fatigue damage, so as to detect the fatigue damage of the material and estimate the fatigue life of the material. At the same time, the diffraction intensity ratio change corresponding fatigue Damage meso-mechanism.