| 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 |
Matrix Crack Propagation Behavior of Cross-Ply CFRP Laminates at Cryogenic Temperature |
| Author(s) |
Koki Mizutani, Kazuyoshi Fujishiro, Hisashi Kumazawa, Toshio Ogasawara |
| On-Site Speaker (Planned) |
Koki Mizutani |
| Abstract Scope |
Carbon fiber reinforced plastic composites (CFRP) are promising materials for cryogenic propellant tanks such as LH2, LO2, and LCH4. It is known that gas leakage is caused through matrix cracks and delamination in CFRP laminates before the structural final failure. Therefore, elucidating the microscopic damage propagation behavior at cryogenic temperatures is crucial for developing liner-less cryogenic propellant tanks. In the present study, we developed a new testing rig for in-situ microscopic damage observation at cryogenic temperatures. Utilizing the test rig, in-situ observations of cross-ply CFRP laminates, [02/90n/02] (n=1, 2, 4), were conducted at room temperature (290 K) and 30 K under tensile loading. At 30 K, the crack initiation strain decreased and the crack density increased compared to 290 K. The crack density increasing trend with tensile strain was independent of test temperature. Additionally, finite element analyses of the mesoscale model were conducted to estimate the matrix crack propagation behavior with considering the statistical distribution of matrix crack propagation. Matrix crack was modeled using the cohesive zone model (CZM). As a result, it was estimated that critical energy release rate at 30 K was approximately the same as that at 290 K. These results imply decrease in the matrix crack initiation strain at 30 K is mainly due to higher thermal residual stress within 90° plies. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |