| 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 |
Damage Evolution of Postbuckled Composite Single-Stringer Panels Subject to Compression After Impact |
| Author(s) |
Vijay Kumar Goyal, Shiyao Lin |
| On-Site Speaker (Planned) |
Vijay Kumar Goyal |
| Abstract Scope |
The project aimed to improve methods for predicting the initiation, progression, and failure of postbuckled composite hat-stiffened panels using commercially available software called Abaqus. Three methods were considered: virtual crack closure technique, cohesive zone model, enhanced Schapery theory, and new Abaqus development. Hat-stringer panels made of IM7-8552 were tested for compression after impact during the NASA Advanced Composites Project (ACP). The hat-stiffened panels were subjected to static axial compressive loading after a barely visible low-velocity impact. The work captures any damage initiation or propagation beyond the initial impact damage state. Abaqus is used for preprocessing, processing, and post-processing. The specimen was modeled with continuum shell elements (SC8R) for all composite plies and solid elements (C3D8R) for all other components. The impact-damaged panel failed at a peak scaled load of 1.033. The Abaqus/Standard runs initiated delamination in the Skin-Hat interface at a scaled load level of 0.671, before experiencing stable growth, including additional growth in the Skin Ply 2-Ply 1 interface initiating at 0.733. This initiation load was lower than the scaled observed onset load from the test, which was 0.876. However, since the initiation occurred in the skin-hat interface beneath the skin-first interface delamination, it would evade the passive thermography system setup. Similarly, the initiation in the skin first interface is so minuscule that it is difficult to compare to the test observations directly. The simulation saw a scaled peak load of 1.045. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |