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 |
Coupled Thermomechanical RVE Analysis of Composite Effective Thermal Conductivities Including the Influence of Failure |
Author(s) |
Drew Sommer, Peter Creveling, Lincoln Collins, Scott Roberts |
On-Site Speaker (Planned) |
Drew Sommer |
Abstract Scope |
The coupled thermomechanical response of fiber-reinforced composites in extreme environments is relevant for different aerospace applications. Modeling techniques capable of predicting the combined thermomechanical response of composite materials are needed to analyze their behavior in these environments. As such, a coupled, representative volume element (RVE) based thermomechanical model was developed to predict the effective thermal properties of composite materials including the effects of failure and damage. The micromechanical analysis was performed at the fiber/matrix scale to represent unidirectional yarns within a woven fabric composite. A damage model was used to describe matrix failure, while cohesive zone elements were used to treat the fiber/matrix interface. Damage in the bulk matrix and interface elements was used to degrade the local thermal properties of the failed material. The effective thermal conductivities for carbon/phenolic composites were predicted numerically for a variety of loading conditions and material properties while enforcing a temperature gradient and periodic displacement boundary conditions. The influence of fracture on the principal thermal conductivities was investigated. Fully developed cracks propagating across the entire RVE reduced the effective thermal conductivity in the crack normal direction by interrupting the heat transfer. Transverse to the crack normal, the impact on the conductivity was less pronounced, particularly in the fiber direction. The combination of matrix and interfacial failure was shown to be critical in defining a fully developed crack and associated reduction in thermal conductivity. Future work involves upscaling to the yarn scale.
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Proceedings Inclusion? |
Definite: Post-meeting proceedings |