双斜接修补复合材料层合板的拉伸行为及影响因素

Experimental and numerical works were performed to investigate the mechanical behavior of double scarf-repaired carbon fiber reinforced polymer(CFRP) composite laminates under tensile loading. The load capacity and damage mode of two different thicknesses double scarf-repaired composites were experimentally studied. The results indicate that for double scarf-repaired composites with different thicknesses, the failure strengths are similar and the dominated failure mode is cohesive failure of the adhesive, accompanied by partial 90° matrix crack of composites. A finite element model was established to predict the failure strength and the damage evolution, in which continuum damage model and cohesive zone model were used to describe the composite and adhesive damage respectively. The numerical results show good agreement with the test results and indicate that the matrix crack of the composites initiates prior to the adhesive failure. Based on the validated model, the influences of overlap patch, location of inner tip and adhesive properties were analyzed.