缝合与非缝合加筋蒙皮结构强度试验研究

缝合技术是增强断裂韧性和加强连接的重要手段。为了验证其相比于传统胶接强度的提高程度,研究设计了复合材料缝合与非缝合T型和L型加筋蒙皮试验件和试验夹具,进行了拉脱破坏强度的对比试验,结果表明缝合后的L型试件平均强度提高了93.4%,而T型试件强度并没有得到提高。从试验现象上分析了出现这种情况的原因。

Experimental Study on Strength of Non-stitched/Stitched Skin-to-Stiffener Structures

Stitch is an important way to enhance fracture toughness and connection.In order to validate its enhancement effect comparing to traditional bond structures,two groups of stitched/non-stitched composite T-shaped and L-shaped skin-to-stiffener performs were designed,and check experiment on the strength of non-stitched/stitched skin-to-stiffener structures,loaded in tensile pull-off,was performed.The results show that the stitched L-shaped specimen strength increased by 93.4% averagely,while the stitched T-shaped specimen did not improve.Reasons for the case were analyzed basing on experimental phenomenon.