基于粘聚力理论的CFRP加固钢板剥离机理研究

碳纤维增强复合材料(CFRP)加固钢板时,CFRP端部往往会发生剥离破坏而导致失效,文中重点研究了CFRP加固钢板的剥离机理.首先根据粘聚力理论建立了CFRP加固钢板的有限元模型;然后对CFRP加固钢板进行了静态拉伸试验研究,并利用试验数据验证了有限元模型;最后基于有限元模型对CFRP剥离破坏的机理进行了研究.分析结果表明:采用粘聚力理论建立的有限元模型可以准确模拟胶层剥离机理;胶层剪应力是CFRP剥离破坏的主要因素,整个过程经历了弹性变形、胶层软化和胶层剥离三个阶段;剥离破坏从CFRP端部开始,逐渐向中间发展,最终导致胶层完全失效.

Theoretical and Experimental Study on Debonding Mechanism of Steel Plate Strengthened with CFRP

The carbon fiber reinforced polymer (CFRP) always debond at the end from the steel plate, which is reinforced with CFRP. A finite element model of steel plate reinforced with CFRP is given out based on the cohesive force theory. Then the tensile experiment of steel plate reinforced by CFRP is studied, and that is used used to verify the finite element model. With the finite element model, it studies the mechanism of CFRP debonding from the steel plate. The results demonstrate that the cohesive method is suitable for the analysis of steel plate reinforced with CFRP, that the shear stress is the main factor of the stripping damage, that the whole process consists elasticity period ,soft period and debonding period, and that debonding begins from the end to the middle of CFRP until complete failure.