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根据金属材料表面由于塑性损伤引起激光衍射谱的变化特征,受损材料声速、密度和弹性常数等的变化导致超声速的改变,用衍射光强比K和超声速C的变化定义了损伤变量D(K)和D(C);对LD10锻铝和40CrNiMoA合金钢材料的塑性损伤进行了检测,讨论了D(K)与D(C)的关系;并对LD10材料的表面粗糙度R_a、扫描电镜下表面微裂纹的长度B、宽度L、解理区内单位面积的空洞数n进行了测量,探讨了它们与两种损伤变量间的关系。
According to the change of laser diffraction spectrum caused by plastic damage on the surface of metal material, the change of supersonic velocity caused by the change of acoustic velocity, density and elastic constant of the damaged material, the change of diffraction intensity ratio K and supersonic velocity C defines the damage variable D (K ) And D (C). The plasticity of LD10 forged aluminum and 40CrNiMoA alloy steel was tested. The relationship between D (K) and D (C) was discussed. The surface roughness R_a of LD10 was analyzed by scanning electron microscopy The length of the surface microcracks B, the width L, the number of holes per unit area in the cleavage zone n were measured, and their relationship with the two damage variables were discussed.