Stacking Sequence Optimization Research Of Variable Stiffness Composite Laminates

Automobile lightweight is an effective means to reduce fuel consumption and exhaust emission. For its good performance, composite has drawn wide attention in the field of automobile lightweight, among which continual fiber-reinforced composite has excellent designability by changing stiffness of laminates, whose property advantages can be fully developed through laminates optimization. With the composite laminates scheme, composite material distribution is more reasonable and mechanical properties and mass of automobile parts are optimized, so that automobile lightweight is further improved.Laminates of variable stiffness used to be designed by experience without systematic design. So in this paper the topology optimization of multi-phase composite was studied, based on which mathematic model of optimization of maximum construction stiffness was built. And the solution of sensitivity was proposed. What’s more, the comparative analysis of common material interpolation methods of DMO and BCP indicates that BCP method has more advantages in optimization rate and solution optimality.As to the difficulty in manufacture of laminates with optimized results, a variable-filter method of mass density based on Heaviside function and mathematical morphology was offered, which, compared with other methods, was applied to numerical computation whose optimized laminates show a clearer thickness distribution, and was approved that phenomena of multihole composite and checkerboard lattice frequently occurring in optimization process was more effectively avoided. Meanwhile, based on precision of processing, optimized minimum geometry size of construction and holes can be controlled, which contributes to improve the manufacturability of optimized results.