含冲击损伤复合材料层压板压缩破坏机制试验研究

Experimental study on compressive failure mechanism of low-velocity-impact-damaged composite laminates

为了研究含冲击损伤复合材料层压板的压缩破坏机制,通过前后表面超声C扫描获得分层损伤在层压板内的分布情况,使用应变片获取层压板两面的应变场,采用声发射观察层压板压缩破坏过程。研究发现:冲击分层损伤在厚度方向上的非对称分布引起层压板内部出现严重的应力集中,致使纤维断裂并最终导致层压板整体破坏;导致含冲击损伤层压板压缩破坏的主要原因为纤维断裂而非分层扩展。

The compressive failure mechanism of low-velocity-impacted composite laminates was studied by means of delamination configuration obtained by ultrasonic C-scan, strain field by strain gauges, and damage process by acoustic emission. The results show that serious stress concentration appears leading to subsequent fiber breakage and triggering catastrophic failure of the laminate because of unsymmetrical delamination distribution within the laminate. The key factor in compressive failure mechanism of impacted composite laminates was fiber breakage rather than delamination propagation.