碳纤维增强环氧树脂复合材料层合板结构及间隙尺寸对铆接性能的影响

通过对不同纺织结构的碳纤维增强树脂基复合材料（CFRP）层合板与铝合金（AlMg3）异质材料连接结构进行单剪切拉伸研究，分析间隙尺寸对不同纺织结构CFRP层合板与AlMg3连接结构性能的影响。试验结果表明，当CFRP层合板铺层数目相同时，对于纺织结构不同、间隙配合尺寸相同的CFRP-AlMg3单铆钉单剪切连接结构，编织结构碳纤维增强树脂基复合材料（WO-CFRP）层合板所受挤压应力比非编织结构碳纤维增强复合材料（UD-CFRP）层合板所受挤压应力大25%左右；对于纺织结构相同、间隙配合尺寸不同的CFRP-AlMg3单铆钉单剪切连接结构，其各自铆钉所受剪切应力和连接CFRP层合板所受挤压应力相差不大。同时对相同间隙尺寸、不同纺织结构的CFRP-AlMg3单铆钉单剪切连接结构各个阶段挤压应力分析得知：其他条件一定，各个阶段中WO-CFRP的挤压应力比UD-CFRP的挤压应力高20%左右。最后研究间隙尺寸对CFRP-AlMg3单铆钉单剪切连接结构性能的影响，发现铆钉与孔壁间隙尺寸对位移为铆钉直径大小的4%时的CFRP层合板受到的挤压应力影响较大，铆钉与孔壁间隙大小增加0.1 mm，位移为铆钉直径大小的4%时的CFRP层合板受到的挤压应力降低约17%，而对CFRP层合板的初始损伤应力和破坏应力几乎没有影响，对铆钉所受剪切作用力和AlMg3板材所受挤压应力也几乎没有影响。

Carbon fiber composite laminate structure and effect of clearance on riveting properties

The single-shear tensile tests on carbon fiber reinforced plastic (CFRP) laminates and aluminum alloy(AlMg3) dissimilar materials with different textile structures were carried out to study the impact of clearance on the joining between CFRP laminates and AlMg3. The test results show that the CFRP-AlMg3 single-shear connection structure with the same clearance and dissimilar textile structure when the layers of CFRP laminates are given, the compressive stress of the woven fabric CFRP(WO-CFRP) laminates is about 25% higher than that of the unidirectional CFRP(UD-CFRP) laminates. Little difference occurs between the shear stress of their rivets and that of the CFRP laminate for CFRP-AlMg3 single-shear joining structures with the same textile structure and different clearance. At the same time, the extrusion stress analysis of CFRP-AlMg3 single-shear joining structure of the same clearance and different textile structure was also studied. The extrusion stress of WO-CFRP in each stage is higher than that of UD-CFRP high stress about 20% when the other conditions are given. Finally, the effect of clearance on the single-shear joining structure of CFRP-AlMg3 single rivet was studied. The results show that the CFRP laminate has a greater influence on the shear stress when the clearance is 4% of the rivet diameter. When the clearance between the rivet and the hole wall is increased by 0.1 mm and the displacement is 4% of the diameter of the rivet, the compressive stress on the CFRP laminate is reduced by about 17%, whereas the initial damage stress and failure stress on the CFRP laminate are almost none affect and the shear stress on the rivets and the extrusion stress on the aluminum alloy has almost no effect.