Si Jianfeng, Zhong Dongwang, Xiong Wei
College of Science, Wuhan University of Science and Technology, Wuhan 430065, China.
Hubei Province Key Laboratory of Systems Science in Metallurgical Process (Wuhan University of Science and Technology), Wuhan 430081, China.
Sensors (Basel). 2020 Mar 17;20(6):1672. doi: 10.3390/s20061672.
This paper developed a piezoelectric-transducer-based damage detection of concrete materials after blasting. Two specimens (with or without an energy-relieving structure) were subjected to a 40 m deep-underwater blasting load in an underwater-explosion vessel, and their damage was detected by a multifunctional piezoelectric-signal-monitoring and -analysis system before and after the explosion. Statistical-data analysis of the piezoelectric signals revealed four zones: crushing, fracture, damage, and safe zones. The signal energy was analyzed and calculated by wavelet-packet analysis, and the blasting-damage index was obtained after the concrete specimen was subjected to the impact load of the underwater explosion. The damage of the two specimens gradually decreased from the blast hole to the bottom of the specimen. The damage index of the specimen with the energy-relieving structure differed for the fracture area and the damage area, and the damage protection of the energy-relieving structure was prominent at the bottom of the specimen. The piezoelectric-transducer-based damage monitoring of concrete materials is sensitive to underwater blasting, and with wavelet-packet-energy analysis, it can be used for postblasting damage detection and the evaluation of concrete materials.
本文开展了基于压电换能器的混凝土材料爆破后损伤检测研究。两个试件（一个有卸能结构，一个没有）在水下爆炸容器中承受了40米深的水下爆破载荷，在爆炸前后通过多功能压电信号监测与分析系统对其损伤情况进行了检测。对压电信号的统计数据分析显示出四个区域：破碎区、裂缝区、损伤区和安全区。通过小波包分析对信号能量进行了分析和计算，并在混凝土试件承受水下爆炸冲击载荷后得到了爆破损伤指数。两个试件的损伤从炮孔向试件底部逐渐减小。有卸能结构试件在裂缝区和损伤区的损伤指数有所不同，卸能结构的损伤防护在试件底部较为突出。基于压电换能器的混凝土材料损伤监测对水下爆破敏感，结合小波包能量分析，可用于爆破后混凝土材料的损伤检测与评估。
