Abstract
The effect of multiple/repeated impacts on a repaired composite was investigated using a low-velocity impact test. The composite samples were fabricated through a vacuum resin infusion method (VARI) and repaired by a scarf repair technique. Later, a repeated low-velocity impact test was performed on the original and repaired composites samples. Performance of the multi-impacted repaired and original samples was evaluated and compared by measuring maximum contact force, maximum displacement, maximum time duration, absorbed energy and damage area. Photographs of the post-impacted samples were taken to observe the multi-impact damage progression through visual inspection. The results showed that each repeated impact subjected the samples to more damage. Tensile tests revealed that the scarf repair restored 81.23% strength. It was also observed that the sample obtained the highest damage dent in the low-velocity impact test that failed early during a tensile test and carried the lowest ultimate load.
Highlights
Bonded repair technique is preferred over classical mechanical fastening due to stress concentration, weight increment, and structural integrity [1,2]
Repaired and original glass fiber-reinforced polymer (GFRP) samples were subjected to multi-impacts and residual tensile strength was tested through tensile after impact (TAI)
The closed curveafter of force verse displacement was obtained for original and repairedstarted composite samples displacement reaching the peak force and maximum displacement to decrease under multi-impact test
Summary
Bonded repair technique is preferred over classical mechanical fastening due to stress concentration, weight increment, and structural integrity [1,2]. The goal of repairing is to restore the stiffness and mechanical strength of a damaged composite laminate. Multi-impact on composite laminates has been studied to understand progressive damage and damage strength degradation [21,22]. The influence of the impact on scarf repair is well studied and investigated [10,12,13,28], repercussions of multi-impact on scarf-repaired glass fiber-reinforced polymer (GFRP) laminates has not yet been evaluated with much consideration. The tensile test has been conducted on the impacted repaired GFRP to acquire the residual tensile strength after the impact test Both the impacted repair and original samples were investigated through visual inspection to detect the damage type. Repaired and original GFRP samples were subjected to multi-impacts and residual tensile strength was tested through tensile after impact (TAI). A relationship between the residual strength of the sample after impact repair and strength of the original sample was established on a comparable basis
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