| 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 |
Development of a Combined Cohesive and Virtual Crack-Closure Technique Approach to Represent R-Curves |
| Author(s) |
Daniel Adam Drake, Carlos G. Dávila, Cheryl A. Rose |
| On-Site Speaker (Planned) |
Daniel Adam Drake |
| Abstract Scope |
Resistance curve (R curve) effects due to fiber bridging, crack migration, and other blunting mechanisms are common in composite laminates. These mechanisms may be desirable because they dramatically increase the resistance to crack propagation. Cohesive elements (CEs) and the virtual crack closure technique (VCCT) are used to predict delamination propagation with R curves. CEs can be used to simulate large fracture process zones, but their use requires highly refined meshes to capture the crack initiation. However, VCCT is a tool that can be used to predict the crack initiation using coarse meshes, but their use assumes small fracture process zones. Representing R-curve effects with VCCT requires input of the fracture toughness values as a function of crack length for specific propagation paths and structural configurations. Therefore, it is desirable to combine CEs and VCCT for an efficient method for predicting delamination with large-fracture process zones using relatively coarse meshes. In this study, a combined CE/VCCT approach is investigated using experimental data for double cantilevered beam specimens of two different thicknesses (5 mm and 15 mm) and cured at two different cure cycles (one-step and two-step cure cycles). The R-curve response from each configuration is determined and applied to the constitutive properties of models built with CEs and with VCCT. The results and computational efficiency of the CEs, VCCT, and combined approaches are compared. The results are used to indicate that a combined cohesive/VCCT approach retains the computational efficiency of VCCT with the ability of the CEs to capture R-curve effects. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |