The properties of the single orthotropic material used in the rocket nozzle extension model are as follows:
| Orthotropic Material Properties | |
|---|---|
| Young's Modulus in x direction (MPa) | 100000 |
| Young's Modulus in y direction (MPa) | 5000 |
| Young's Modulus in z direction (MPa) | 5000 |
| Poisson’s Ratio PRXY | 0.40 |
| Poisson’s Ratio PRYZ | 0.30 |
| Poisson’s Ratio PRXZ | 0.30 |
| Shear Moduli GXY | 3000 |
| Shear Moduli GYZ | 2000 |
| Shear Moduli GXZ | 2000 |
| Secant coefficient of thermal expansion ALPX | 1.6E-05 |
| Secant coefficient of thermal expansion ALPY | 1.6E-05 |
| Secant coefficient of thermal expansion ALPZ | 6.3E-05 |
The material is assumed to be linear elastic and temperature-independent. The material has different thermal expansion coefficients in the in-plane (X and Y) and through-the-thickness (Z) directions.