Abstract:

The purpose of the present study is to investigate acoustic emission features on damage mechanisms of PE self-reinforced composites. According to quasi-static tensile test on LDPE resin, axial and transverse of unidirectional laminate, matrix damage, interface damage and fiber damage were activated and their AE features were investigated. Experiment revealed that various damage mechanisms resulted in distinct difference in AE features. Matrix plastic transformation and matrix fracture generated AE signal with amplitude 40-60 dB duration less 800µs and amplitude 75-90 dB duration 2300-2600µs respectively. Based on damage level, interface damage generated AE signals with 40-60 dB、less than 500µs，40-80 dB、500-2000µs and over 90 dB、3000-7000µs，respectively. Single fiber breakage and fiber bundle breakage generated AE signals with amplitude 40-75 dB，duration less than 1000µs and over 90 dB、duration 1500-2000µs， respectively.