Experimental study on static tension and tension-tension fatigue of scarfing repaired plain woven composite laminates

doi:10.19936/j.cnki.2096-8000.20230428.011

Abstract

Abstract: The effects of scarf repairing on static tensile and tension-tension fatigue properties of plain woven composite laminates were studied experimentally, and the fatigue test stress ratio R was 0.1. The results show that the static tensile strength, static tensile modulus, tension-tension fatigue limit and residual load of laminates are reduced by scarf repairing, and the recovery rates are 64.9%, 82.5%, 80.7% and 76.6%, respectively. The recovery extent of tension-tension fatigue life decreases with the increase of load level. The fitted S-N curve has high reliability in the finite life region. After 10⁶ cyclic loading, the remaining loads of intact parts and repaired parts are both less than static tensile failure loads, and the corresponding stiffness increase. Fiber fracture and matrix cracking occur at the fractograph of all the test pieces. Fiber fracture is the main failure mode of the intact test pieces with the delamination damage. Shear failure occur between the patch and adhesive layer at the fractograph of the repaired test pieces, resulting in obvious debonding between the patch and the parent laminate.

Key words: composite, scarf repair, S-N curve, tensile, fatigue

CLC Number:

TB332

SHI Xiaojun, WANG Xuan, YANG Chenchen, GAO Junfu. Experimental study on static tension and tension-tension fatigue of scarfing repaired plain woven composite laminates[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(4): 70-77.

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