聚氨酯涂层对复合材料层板冲击后压缩性能的影响

Evaluation of Compression after Impact on Composite Laminates Coated with PU

对聚氨酯喷涂复合材料层板进行反复低速冲击试验和冲击后压缩试验,研究了损伤程度、层板厚度和涂层厚度对聚氨酯喷涂复合材料层合板冲击后压缩强度的影响,并通过数字图像相关(DIC)检测压缩过程分析了不同损伤程度试样的破坏过程和破坏模式。结果表明:随着冲击次数的增加冲击后压缩强度存在拐点,随着层合板厚度的增加试样的冲击后压缩强度降低,随着涂层厚度的增加含聚氨酯的试样冲击后压缩强度明显提高;压缩破坏位置与损伤程度有关,试样的损伤程度不同其压缩破坏过程也不同。

The tests of repeated low-velocity impact and compression after impact on composites laminates coated with PU were carried out, and mainly focused on the factors of damage degree,the thickness of composites and coating which could affect the compression strength after impact of composite laminates coated with PU. Moreover the process of compression after impact acting on laminated was tested via digital image correlation（DIC） which can gather the topography of specimens during testing in time, so the damage process and damage modes of specimens with various damage degrees were analyzed. Finally, the conclusions can be acquired：The damage inflection point exists by the increasing of impact numbers, and the compression strength decreased with increasing the thickness of composite laminates. In addition, the compression strength after impact of composite laminates coated with PU increased with increasing coating thickness. As for the specific damage position of different specimens, it is related with damage degree, which is also related with compression damage process.