Fatigue Topology Optimization Based on Global Stress Constraint Method

摘要

In topology optimization design for continuous structure,common mechanical properties considered in optimization model focus on structural strength,stiffness and stability.However,fatigue characteristic of structure is easily ignored,which is one of the main causes of engineering failure.Therefore,it is necessary to consider the fatigue characteristic for the optimization design of the structure.In order to investigate the influence of fatigue on structural topology in optimization design,fatigue life fdter function is introduced and then the model and solution method of fatigue topology optimization for continuous structures are proposed based on independent continuous mapping method(ICM).The fatigue topological optimization model is established with structure minimum weight as objective and fatigue life as constraint,and the model is solved by global stress constraint method.The results extend the ICM method and this basic theory provides a new idea for fatigue topology optimization.