铺层方式对CFRP-Al单搭接接头胶接性能的影响

使用热压罐制备45/-45]_4s、0/90]_4s和0/45/-45/90]_2s三种铺层方式的CFRP层合板，然后在室温下与Al胶接制备出单搭接试样。使用电子万能试验机、数字图像相关法(DIC)和扫描电子显微镜(SEM)等手段测量胶接接头的拉伸载荷-位移曲线和应变分布并观察断口形貌。基于试验数据分析不同铺层方式下CFRP-Al单搭接接头的拉伸性能，研究了铺层方式对CFRP-Al单搭接接头胶接性能的影响和铺层方式胶接接头的破坏机制。结果表明，在拉伸过程中45/-45]_4s试样出现塑性变形阶段其拉伸位移最大，而0/45/-45/90]_2s和0/90]_4s试样的拉伸位移较小且发生了脆性断裂。铺层方式从45/-45]_4s到0/45/-45/90]_2s再到0/90]_4s，试样的极限载荷和纤维束断裂数量增加、层间剪切力减小、应变集中程度和分层破坏程度降低。

Effect of Stacking Sequences on Bonding Performance of CFRP-Al Single-lap Joint

Laminated plates of carbon fiber reinforce plastic (CFRP) with different stacking sequences, namely 45/-45]_4s, 0/90]_4s and 0/45/-45/90]_2s were produced via autoclave.They were glue-jointed with Al-plate to prepare single-lap joint samples at room temperature. The single-lap joint performance of the prepared samples was assessed by means of universal testing machine, digital image correlation (DIC) and scanning electron microscope (SEM) in terms of load-displacement curves, strain field distribution and fracture appearance of adhesive joints. On this basis, the mechanical properties of CFRP-Al single-lap joints were analyzed, the influence of different stacking sequences on the bonding performance of CFRP-Al single-lap joints, while the failure mechanism of adhesive joints were revealed. The results show that during the tensile process, the sample with 45/-45]_4s presents a plastic deformation stage and its tensile displacement is the largest; while the tensile displacements of samples with 0/45/-45/90]_2s and 0/90]_4s are less, and they present brittle fracture. In general, the ultimate load of the sample and the number of fiber bundles fracture increase for samples in the following order, namely samples with 45/-45]_4s, 0/45/-45/90]_2s and 0/90]_4s, but their interlaminar shear force, the strain field concentration degree and the delamination damage degree gradually decrease.