| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Impact Fatigue in Carbon Fiber Reinforced Composites |
| Author(s) |
Isabella Mendoza, Leslie E. Lamberson |
| On-Site Speaker (Planned) |
Leslie E. Lamberson |
| Abstract Scope |
Carbon fiber-reinforced polymer (CFRP) composites are prized for their superior strength-to-weight ratio and resistance to oxidation when compared to traditional metals. However, the integrity of CFRP laminates is compromised by their vulnerability to transverse loads, particularly through low-energy impacts that cause barely visible impact damage (BVID), making detection challenging. Furthermore, these materials are prone to degradation under environmental conditions, with moisture uptake posing a significant risk. Until now, research into the combined behavior of environmental conditioning and repetitive impact loading on CFRPs has been lacking. Traditional methods for assessing impact damage in CFRPs often involve either non-kinematic measurement techniques or destructive testing, both of which are costly in terms of materials and equipment. This study aims to fill this gap by examining the effects of both impact fatigue and environmental conditioning on CFRPs using non-destructive, full-field kinematic measurements. The research conducted low-cycle repetitive impacts at 2 J on both unidirectional and quasi-isotropic CFRPs. Utilizing the virtual fields method (VFM) alongside digital image correlation (DIC), this study was able to identify local mechanical imbalances in post-impact specimens under static bending loads. A damage parameter quantifying damage severity and morphology through equilibrium gap (EG) mapping is introduced. The results reveal a significant increase in damage after specimens absorbed approximately 1% moisture, with damage escalating by an order of magnitude following 2% moisture absorption. These findings underscore the effectiveness of leveraging VFM and full-field kinematic measurements for quantitatively assessing the structural integrity of CFRPs under combined environmental-mechanical loading. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |