疲劳损伤的激光衍射谱面光强检测方法研究

Fatigue Damage Detection by Laser Diffraction Spectrum Intensity Ratio

根据表面光反射原理,提出一种非接触,非破坏的间接疲劳损伤检测方法,并用40CrNiMoA和LD5材料进行了拉一压非对称循环疲劳检测。试验结果表明,谱面光强的变化对疲劳损伤是敏感的;利用损伤变量D(K_1)和循环次数N的关系曲线,可以对材料进行疲劳损伤检测并对其疲劳寿命进行预测。

A non-contact, non-destructive remote fatigue damage monitoring technique is described. This technique employs a laser beam that illuminates the surface of a cyclically loaded specimen, and an optical system that extracts fatigue damage information from the surface. Tension-Compression fatigue tests were carried out on LD5 aluminum alloy specimens and alloy steel 40CrNiMoA. The results show that change of spectrum intensity ratio (K_1) is sensitive to fatigue damage, and the spectrum width was observed to increase with the number of loading cycles. The relationship between damage variable D(K_1 ) and number of fatigue cycles (N) can be used to detect fatigue damage and to divine fatigue life tbr metal materials.