Abstract
Due to their excellent impact resistance, high toughness, short forming time, and recyclability, carbon fiber-reinforced thermoplastic (CFRTP) composite materials can be blended and bonded with aluminum alloys (Al) to produce lighter structures with better impact resistance. In this study, the effects of impact energy (5, 10, 15, 20 J) and impact surface (CFRTP and Al) on Al/PEEK/CFRTP joints with different relative bond lengths (20/L, 25/L, 35/L, 45/L, where L is the length of the adherend) were explored through a combination of joint impact damage modes, energy absorption rates, residual strengths, and tensile fracture surfaces. The results showed that when the relative bond lengths were 20/L and 25/L, using CFRTP as the impact surface significantly reduced the residual strength loss of the joint. When the relative bond lengths were 35/L and 45/L, the influence of the impact surface on the joint was significantly reduced. A relative bond length of 35/L was the ideal choice for structural safety and cost savings.
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