Abstract
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.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research is supported by the Office of Naval Research under Grant No. N00014-17-1-2497. The authors also thank Dr. Robert Goldberg, Dr. Gary Roberts, and other collaborators from NASA GRC for providing samples and insightful conversations.
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Journal of Aerospace Engineering
Volume 35 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 6, 2021
Accepted: Jul 22, 2021
Published online: Sep 16, 2021
Published in print: Jan 1, 2022
Discussion open until: Feb 16, 2022
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