| 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 |
Experimental and Numerical Investigation of Shear-Driven Fracture in Hybrid Tape/Fabric-Laminate End-Loaded-Split Specimens |
| Author(s) |
Erik Langlo, David Mollenhauer, Endel Iarve, Michael Czabaj |
| On-Site Speaker (Planned) |
Erik Langlo |
| Abstract Scope |
Development of progressive damage analysis (PDA) tools that can accurately simulate crack propagation in tape-laminate carbon/epoxy composites is essential for reducing reliance on empiricism in composite structural design. PDAs must be exhaustively evaluated against high quality experiments to validate and improve their predictive capabilities. In a past study, an experimental and numerical procedure was developed that isolates and controls the interplay between shear-driven intralaminar crack migration and interlaminar delamination for hybrid tape/fabric-laminates. Results of that study, which used AFRL/UTA’s PDA tool, BSAM, highlighted the inability to accurately simulate both crack migration and delamination for materials which experience rising resistance curves (R-curves). The objective of this investigation is to experimentally characterize the fracture toughness at tape/fabric interfaces and validate new advancements in BSAM that incorporate the R-curve effects. Specimens are tested in the double cantilever beam configuration to measure mode I fracture toughness at the tape-fabric interface, and the end-loaded-split configuration to measure mode II fracture toughness when driving the crack into the fabric ply of the interface, resulting in two distinct R-curves. Numerical simulations of both loading scenarios, with the corresponding R-curve implemented, are compared against the experimental results to confirm that BSAM can accurately model delamination along an interface with a rising R-curve. More complex test scenarios that include shear-driven crack migration and delamination are subsequently simulated. These findings will assess the predictive nature of BSAM when analyzing shear-driven failure in hybrid tape/fabric-laminates and determine additional modifications that should be considered in future studies. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |