Journal article
Rate-Dependent Fracture Behavior of Aerospace Epoxies: PR-520 and 3502
Journal of aerospace engineering, v 35(1), 04021100
01 Jan 2022
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 0.60 MPa root m, 56% lower than the average dynamic fracture toughness of 1.07 MPa root m. However the PR-520 samples exhibited the opposite behavior, demonstrating greater quasi-static fracture toughness averaging 1.60 MPa root m with dynamic values of 0.71 MPa root m. 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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Details
- Title
- Rate-Dependent Fracture Behavior of Aerospace Epoxies: PR-520 and 3502
- Creators
- Emily Pittman - Colorado School of MinesStylianos Koumlis - Colorado School of MinesHtet Naing Aung - Drexel UniversityAmanda Bellafatto - Drexel UniversityLeslie Lamberson - Colorado School of Mines
- Publication Details
- Journal of aerospace engineering, v 35(1), 04021100
- Publisher
- ASCE
- Number of pages
- 10
- Grant note
- N00014-17-1-2497 / Office of Naval Research; United States Department of Defense; United States Navy
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000719534800021
- Scopus ID
- 2-s2.0-85115225806
- Other Identifier
- 991021861293204721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Aerospace
- Engineering, Civil