I have been working with CFRP composites with different fiber orientations. Since they are anisotropic the material properties vary based on the fiber directions. I have been able to figure out a mathematical model that exhibits the relationship between fiber orientation and thermal conductivity. However, even after going through an extensive literature review, I have not been able to find any mathematical model that establishes a relationship between the specific heat capacity of a composite depending on the fiber orientation angle. Without going through experimental procedures to determine the heat capacity, is there any mathematical model available that proposes a relationship between the aforementioned two parameters? Your suggestions will be duly appreciated. Thank You.
Dear Fahim,
why do you think the heat capacity should be direction dependent? It's not a transfer property like conductivity. The heat is stored in atomic/molecular movement and vibration. Therefore, the capacity depends on the type and amount of atoms and their ability to store energy. That, in turn, is given by the composition, conversion, temperature, crosslink density, interface layer, etc., but not the direction. That's the reason why you couldn't find relevant literature. Practically speaking, the fiber orientation may indirectly affect the capacity through the locally varied curing efficiency, distribution of defects at the fiber-matrix interface, etc., but that's a different story.
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