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 |
Multiscale Modeling of the Effect of Semi-crystalline Morphology on the Thermomechanical Response of Thermoplastic Composites |
Author(s) |
Evan Pineda, Jamal Husseini, Joshua Kemppainen, Scott Stapleon, Gregory Odegard |
On-Site Speaker (Planned) |
Evan Pineda |
Abstract Scope |
The matrix phase of thermoplastic composites (TpCs) is composed of semi-crystalline spherulites that nucleate in the bulk matrix and a transcrystalline region that nucleates at the fiber-matrix interface. The semi-crystalline spherulite contains an anisotropic core with an isotropic shell. The local volume fraction of the crystalline phase in both the spherulites and transcrystalline regions decrease as a function of the distance from the nucleation site. Nucleation and growth (or impingent of growth) is heavily affected by the presence of fibers. Additionally, a fully crystallized material only contains ~25-30% crystallinity and the final state of the composite may not be fully crystallized depending on the processing conditions. Therefore, the thermomechanical response of the transverse and shear thermomechanical properties of thermoplastic composite (TpC) polymers lamina is heavily influenced by the semi-crystalline morphology of the matrix. Moreover, this morphology is multiscale in nature spanning several length scales. To predict the effects of the morphology of the semi-crystalline microstructure on the thermomechanical response of TpC materials, the composites are modeled using input from Molecular Dynamics simulations and the multiscale recursive micromechanics (MsRM) methodology in the NASA Multiscale Analysis Tool. As such, the explicit arrangement and hierarchical organization of the crystalline and amorphous phases in the TpC are modeled. Of particular interest are the effective elastic properties, thermal conductivity, coefficient of thermal expansion and fracture behavior. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |