Topology optimization of truss-like continua with different material properties in tension and compression
The literature on the topology optimization of truss-like continua has relatively few publications that look at the problem of structures with different material properties/behaviour in tension and compression. After reviewing the literature on optimality criteria, ground structure approach, growth method for truss structures, SIMP, homogenization and heuristic methods of topology optimization, a method is proposed in this paper which consists of identifying all negative (compressive) parts of a structure; modifying their modulus of elasticity; changing their material properties to orthotropic, modifying the stresses or strains and satisfying the optimality criterion of a constant stress/strain ratio between the tensile and compressive parts of the structure. The validity of this technique is demonstrated on several examples, including comparisons with results by other methods.
topology optimization trusses dual material stress constraints