Experimental Investigation on Compression Failure Mechanism of Composite Laminates with Impact Damage Based on Acoustic Emission
含冲击损伤复合材料层压板压缩破坏机制的声发射特性研究

Compression failure process of composite laminates includes a lot of acoustic emission information. In order to study the compression failure mechanism of composite laminates with impact damage, the compression failure process was observed by acoustic emission. Through analyzing the characteristics of acoustic emission signal, the material damage form and its evolution under compressive loading were characterized. Results show that through comprehensive analysis of acoustic emission parameters, including impact count, energy, amplitude and event location etc. and loading curve, it is found that the developing process of damage undergoes three stages including initial stage, steady extension stage and break stage. The buckling caused by impact appears first at layered area, where the damage also emerges earliest. During the initial stage and steady extension period, damage presents progressive growth, and the laminate has a certain carrying capacity; while during the break stage, damage expands rapidly, the carrying capacity of laminate declines rapidly; finally, the overall damage appears after intensive fiber breakage.