LY12CZ铝合金三点弯曲损伤的声发射监测

LY12CZ铝合金三点弯曲损伤的声发射监测

本文采用声发射技术对LY12CZ铝合金试样三点弯曲损伤断裂过程进行监测，探索声发射技术在金属构件断裂损伤研究中的应用。介绍了信号采集系统，提供了硬件系统常用的降噪措施。试验分恒定载荷和加载速率为定值两类情况进行，分析了试样在不同情况下的声发射监测试验结果。

MONITORING OF DURALUMIN LY12CZ THREE-POINT-BENDING FRACTURE PROCESS WITH AE TECHNIQUE

Gao Chengqiang Wang hangong Yang Nengjun Liu Xiaofang

(Secton 501 of the Second Artillery Engineering College, Xi’an, 710025)

Abstract: Based on the analysis of the AE experiment, which monitored the LY12CZ duralumin sample’s three-point-bending fracture process, the paper probed into the application of acoustic emission technique to studying the metal component damage. Signal acquisition system is presented and common denoise methods of hardware system are supplied. The experiment is conducted in two cases, one with constant load and another with constant loading rate. Experiment results of acoustic emission monitoring of different cases are analyzed.

Keywords: Duralumin，Acoustic Emission，Noise，Three-point-bending

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B=12mm，高度W=24mm，长度L=120mm，预制裂纹a=9mm，试验跨度S=100mm。

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[5]；但达到临界状态后，由于没有更多的能量储存，使得裂缝扩展呈失稳状态，出现连续和迅速的声发射。

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