| 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 |
A Fracture Mechanics Based Methodology to Address Face Sheet/Core Disbonding in Composite Sandwich Structures |
| Author(s) |
Ronald Krueger, Dan Adams, Christian Berggreen, DM Hoyt, Vishnu Saseendran |
| On-Site Speaker (Planned) |
Vishnu Saseendran |
| Abstract Scope |
Face sheet/core disbonding poses a threat to the structural integrity of a sandwich component. In this study a methodology is proposed to predict the onset and growth of face sheet/core disbonding in sandwich structures. The methodology is similar to the one used for delaminations in monolithic composite laminates where an assessment is typically made by measuring a critical strain energy release rate. Two general steps are required to address the phenomenon associated with face sheet/core disbonding. First, a reliable means of characterizing face sheet/core disbonding has to be established. The Single Cantilever Beam (SCB) test, has been identified as the most appropriate configuration to develop an ASTM standardized test method for a mode I dominated fracture toughness of sandwich constructions. Additionally, the development of a guide for mode I fatigue based on the static SCB test is proposed. Further, a Sandwich Mixed-Mode Bending (S-MMB) test for mixed-mode I/II fracture toughness of sandwich constructions based on the ASTM MMB test for laminates is suggested. Second, analysis methods are required to help assess the likelihood of a structure exhibiting critical disbonding. The Virtual Crack Closure Technique (VCCT) and the Crack Surface Displacement Extension (CSDE) methods have been used to calculate the total energy release rate along the disbond front based on the results obtained from high-fidelity finite element analysis of the disbonded sandwich panel. An alternate approach uses cohesive elements at the interface to determine disbond growth. A rapid engineering analysis tool based on an energy-based Rayleigh-Ritz approach is also discussed. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |