L型构件R区的超声相控阵检测方法

 针对常规超声检测难以胜任L型构件R区检测的问题,开展L型构件的超声相控阵检测方法研究。利用超声相控阵声束灵活可控的优势,制定了线阵换能器检测L型构件R区的检测方案;基于Fermat原理,提出了相控阵检测多层介质的延迟时间计算方法;通过有限差分法数值仿真和检测试验,验证了相控阵检测方案和延迟时间计算方法的正确性;最后,对复合材料L型试样R区进行检测试验,检测结果与实际试样信息基本一致。研究结果表明,所提出的采用线阵换能器检测L型构件R区的检测方法是可行有效的。

Ultrasonic Phased Array Inspection Method for the Corner of L-shaped Components

Since the conventional ultrasonic testing approach is not competent for the corner inspection of L-shaped components, an ultrasonic phased array inspection method is studied for this purpose, which has the advantage that the beam can be controlled flexibly. Taking this into consideration, an inspection method of L-shaped components with linear array transducers was proposed. The delay time for the inspection of multilayer media was calculated according to Fermat’s principle. A finite difference numerical simulation and a testing experiment were conducted to verify the scheme of phased array inspection and the method of delay time calculation. Finally, a composite L-shaped specimen was detected and the experimental results were similar to the actual information of the specimen. The results show that it is feasible and effective for the ultrasonic phased array technique to detect the corner of L-shaped components with linear array transducers.