| 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 |
Computational Assessment of the Opening Mode Facesheet-to-Core Fracture Toughness of a Thin-Gage Facesheet Sandwich Structure |
| Author(s) |
Daniel Adam Drake, James G. Ratcliffe, Nelson Vieira de Carvalho, Anthony J Paris |
| On-Site Speaker (Planned) |
Daniel Adam Drake |
| Abstract Scope |
The single-cantilevered beam test (SCB) is currently being considered for standardization for measuring the opening mode fracture toughness of sandwich structures subjected to facesheet-to-core separation. In previous work, SCB tests were performed to compare the J integral approach to data reduction methods in the American Society of Testing and Materials (ASTM) international technical standard draft (ASTM International Work Item 56166). Large deviations (over 10%) in the calculated fracture toughness were observed between the J-integral and modified beam theory (MBT) for long crack lengths (over 3 in.). In this study, a simulated SCB experiment using a virtual crack-closure technique was performed to assess the previously observed discrepancies between each analytical approach. The predicted load displacement response, the predicted angle at the load application point, and the predicted crack growth results were in good agreement (within 5%) with the corresponding experimental data. Using the predicted load and angles, the predicted J-integral was in good agreement (within 10%) with the experimentally obtained solution. Using the MBT approach with the predicted values demonstrated that the previously observed deviations were associated with the empirical extrapolation procedure to estimate the crack-root rotation correction. The extrapolation procedure for long crack lengths resulted in an increase in the crack-root rotation correction, which yielded significant decreases in the fracture toughness using the MBT method. These observed decreases in fracture toughness are attributed to large displacement effects observed within the predicted and experimental results. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |