Effect of Cycling Low Velocity Impact on Mechanical and Wear Properties of CFRP Laminate Composites

Abstract

The mechanical and wear properties of CFRP laminate were investigated using a method of cycling low velocity impact, to study the trend and mechanism of impact resistance of the CFRP laminate under repeated impact during its service process. The interface responses of CFRP laminate under different impact kinetic energy during the cycling impact process were studied were studied experimentally, such as impact contact duration, deformation and energy absorption. The worn surface morphologies were observed through optical microscopy and a 3-D surface profiler and the cross-sectional morphologies were observed through SEM to investigate the mechanism of impact material damage. Based on a single-degree-of-freedom damping vibration model, the normal contact stiffness and contact damping of the material in different wear stages were calculated. It shows the failure process of CFRP laminate damaged by accumulated absorption energy under the cycling impact of different initial kinetic energy. The results indicate that the stiffness and damping coefficients will change at different impact velocities or cycle numbers. The damage mechanism of CFRP laminates under cycling low kinetic energy is delamination. After repeated experiments, it was found that there was a threshold value for the accumulated absorption energy before the failure of the CFRP laminate.

Feasibility study of an integrated pre‐curing and forming process for 6061 Al alloy and carbon fiber hybrid composites

“…Due to its low energy absorption capacity, internal stratification when subjected to low-speed impact loads is one of the main failures of CFRP materials. 6,7 Al alloys has the advantages of abrasion and corrosion resistance, good elasticity, high impact resistance, good processing performance, high recycling rate, better ductility and load-bearing strength, and so on., which is the ideal material for automotive lightweight. 8,9 Fiber metal laminates (FML) are characterized by low density, high modulus, high strength and impact resistance, while also reducing the high cost of single carbon fiber materials.…”

“…However, CFRP has a low tolerance to impact damage, including delamination at the interface, fiber breakage and matrix cracking. Due to its low energy absorption capacity, internal stratification when subjected to low‐speed impact loads is one of the main failures of CFRP materials 6,7 . Al alloys has the advantages of abrasion and corrosion resistance, good elasticity, high impact resistance, good processing performance, high recycling rate, better ductility and load‐bearing strength, and so on., which is the ideal material for automotive lightweight 8,9 .…”

Impact force localization and reconstruction via ADMM-based sparse regularization method

“…Characterized by exceptional properties of high strength-to-weight ratio, composites have been widely used in such industries as the aerospace to make transportation lighter [1]. Unfortunately, composite structures are quite sensitive to impact forces from foreign object debris(FOD) like stones, hail and birds during service, and are then susceptible to the barely visible impact damage(BVID), including delamination and debonding [2,3]. Such internal damage is tricky to detect by the routine procedure like preflight visual inspection, and can wherefore wreak havoc on structural integrity, jeopardising service security and even cause catastrophic failure [4].…”