45#钢裂纹尖端塑性损伤的超声评估

Evaluation of Plastic Damage at Crack tip of 45 # Steel with Ultrasonic Method

超声衰减系数是超声传播特性中的一个重要参数 ,实验表明根据超声衰减系数的变化可以评估 4 5# 钢的塑性损伤 .结果还表明 ,随着载荷的不断增加 ,裂纹尖端塑性区扩展到探测区内的面积不断增加 ,超声衰减系数将随之有规律地增加 ,并据此可以预报裂纹的扩展 .

The ultrasonic attenuation coefficient is an important parameter in the ultrasonic propagation. It is verified experimentally with samples that the plastic damage in 45 # steel can be evaluated with the variation of the ultrasonic attenuation coefficient, as it is shown that an increase of the load leads to an increase of the area of the crack tip region extending into the detecting region and accordingly an increase of the ultrasonic attenuation coefficient with regularity.