This study systematically investigates stiffness and buckling response of finite structures consisting of repeated unit cells of a reference truss lattice microstructure and a topology optimized microstructure with enhanced buckling strength. Structural stability is evaluated using linear buckling, nonlinear pre-buckling, and post-buckling analyses, subjected to two benchmark loading cases representing uniaxial compression and shear loading. Numerical results indicate that geometric and material nonlinearities play a surprisingly small role in uniaxial loading, whereas strong effects are seen for the shear loading case for which the microstructure was not optimized.
- Structural stability
- Finite periodic structures
- Linear buckling analysis
- Nonlinear pre-buckling analysis
- Post-buckling analysis