通过缝合的方法改善织物增强复合材料层合板的层间断裂韧性.采用双悬臂梁(DCB)试验测试和研究了缝合层合板的层间断裂韧性与断裂行为.为了评价缝合工艺参数(缝合密度)对层间断裂韧性的影响,用改进的插入型夹具在实测不同缝合工艺层合板的Ⅰ型层间断裂韧性值(GIC)的基础上,分析和阐明了缝合工艺参数(缝合密度)与GIC间的关系;以提高层合板的平均层间断裂韧性值为目标,以拉伸和弯曲强度为约束条件优化了缝合工艺;采用摄影显微镜对分层断裂面进行了观察,分析和考察了缝合对其它性能的影响.结果表明:改进的插入型夹具可方便地完成缝合层合板的Ⅰ型层间断裂韧性测试;缝合后裂纹不连续扩展,缝合密度对裂纹扩展行为有较大影响;随着缝合密度的增大,层间断裂韧性值增大,但拉伸和弯曲强度降低,缝合密度存在最佳值.
A stitch method was adopted to improve interlaminar fracture toughness of fabric-reinforced laminates.
The double cantilever beam (DCB) test was executed for stitched laminates to study interlaminar fracture toughness and fracture behaviour. The improved insert type loading fixture was adopted to test the
Mode I interlaminar fracture toughness (GIC) of different stitching laminates and the relation between the stitch parameters(stitch density) and the interlaminar fracture toughness (GIC)
was discussed. In order to improve the average interlaminar fracture toughness, stitching technique was optimized under the restriction of stretching and curving strength. Photographic microscope was
used to observe the fracture interface. The effect of stitching parameters on the other performance was also analyzed. The results show that the test of the interlaminar fracture toughness of the laminate
can be easily done by using the improved insert type loading fixture; The extension of the opening is discontinuous and the stitch density has a great effect on the opening extension; The bigger the stitch
density is, the bigger the interlaminar fracture toughness is, but the stretching and curving strengths decrease with the increasing of the stitch density, and the stitch density has a optimum value.
参考文献
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