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原有的冲击后压缩试验夹具无法防止薄板的整体失稳,为了获得正确的破坏模式,通过有限元分析设计了新的试验夹具。试验证明了新夹具的有效性,没有改变试件原有的应力状态,可以获得与标准试验相同的破坏模式。对比了不同铺层比和不同材料复合材料薄板的冲击后压缩性能。试验结果表明铺层比对冲击后压缩强度的影响很大,不同铺层比层合板的冲击后压缩破坏应变基本一致,织物铺叠层合板的CAI性能略与单向带铺叠的层合板差别不明显。
The original post-impact compression test fixture can not prevent the overall plate instability, in order to obtain the correct failure mode, the design of a new test fixture by finite element analysis. Test proved the effectiveness of the new fixture, did not change the original stress state of the specimen, you can get the same failure mode as the standard test. The post-impact compression performance of composite materials with different lay ratios and different materials was compared. The test results show that the ply ratio has a great influence on the compressive strength after impact, and the compressive failure strain after impact of different plies is basically the same after impact. The CAI performance of the fabric laminated plywood is slightly different from that of the unidirectional laminated plywood Not obvious.