| 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 |
Modeling the Strain Softening Behavior of Aligned Discontinuous Fiber Prepreg During Thermoforming |
| Author(s) |
Andrew Stack, Pavel Simacek, Kyle Morris, Tom Cender, Suresh Advani |
| On-Site Speaker (Planned) |
Andrew Stack |
| Abstract Scope |
Modeling composite sheets in thermoforming simulations saves re-sources by optimizing processing conditions without using the material. How-ever, the material’s behavior must be modeled accurately to predict stress, strain, and defects that affect the final part quality. Highly-aligned discontinuous fiber prepregs exhibit not only very high anisotropy, but also a softening effect with increasing strain during extension. The extensional viscosity exhibits a fast decay from an initial peak that levels into a linear decrease with additional deformation. This strain softening behavior is inherently unstable. Once a local region strains more than the surrounding area, it will soften and strain even more, leading to large local strain and failure. To model this effect, a user-defined constitutive material model that described the full extensional behavior of aligned discontinuous fiber prepreg was implemented in a composite forming software AniForm. The model was validated by comparing results to the 2D strain states during thermoforming experiments. The model’s constitutive equations are discussed, and the validating comparison between model and experiments is presented. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |