The theory has been implemented in a MATLAB software module and validated against VABS. The first validation case was for a single-cell composite box beam VABS example shown in Figure 2.
The elements of the 4×4 stiffness matrix, S, obtained from the implementation are compared to those produced by VABS in Table 1. Not all elements are shown since the stiffness matrix is symmetric.
The three-cell isotropic box beam shown in Figure 3 is another validation of the current implementation against VABS, where the stiffness matrix is now calculated about the lower-left corner of cross-section.
Similarly, The elements of the 4×4 stiffness matrix, S, obtained from the implementation are compared to those produced by VABS in Table 2.
Table 2. The elements of the stiffness matrix obtained using the thin-walled anisotropic beam theory and VABS for Figure 2.
The results presented in Tables 1 and 2 clearly validate the present implementation to model single/multi-cell thin-walled anisotropic cross-sections of rotor blades found on actual helicopters and turbine engines.