To understand the response of polymeric materials used in fiber-reinforced composite structures, it is necessary to examine their brittle failure mechanisms under various loading scenarios. As such, this study presents the quasi-static and dynamic fracture response of aerospace resins 3502 and PR-520. Quasi-static fracture investigations were performed on precracked samples using single edge notch tension (SENT) configuration in a standard load frame. Dynamic fracture investigations were conducted using a unique long bar device where a projectile impacts the sample to generate wave-driven Mode-I (opening) fracture. Digital image correlation (DIC) is used in conjunction with ultrahigh-speed imaging to extract the stress intensity factor (SIF) at crack initiation using the stationary crack solution. Both material systems exhibited rate-dependent fracture behavior. For 3502, the average quasi-static fracture toughness was , 56% lower than the average dynamic fracture toughness of . However the PR-520 samples exhibited the opposite behavior, demonstrating greater quasi-static fracture toughness averaging with dynamic values of . The difference in behavior between the resins may be attributed to polymer chain crosslinking, where the lower degree of crosslinking in PR-520 enables increased elastic deformation and resistance to fracture under quasi-static loading, and the higher degree of crosslinking in 3502 gives rise to an increased resistance to fracture under dynamic loading.
Rate-Dependent Fracture Behavior of Aerospace Epoxies: PR-520 and 3502
Journal of Aerospace Engineering ; 35 , 1
2021-09-16
Article (Journal)
Electronic Resource
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