Structure Optimization Of Fiber Reinforced Composites Based On MMC Method

Topology optimization is characterized by wide design freedom,high material utilization rate,excellent structural performance and rapid development.Composite materials are widely used in various industries due to their high specific modulus and high strength.Therefore,the application of composite materials to topologically optimized structures is favored by relevant scholars.Fiber-reinforced composite materials are continuous and designable due to their fiber angle and fiber layer thickness.Different fiber angles show different properties.Therefore,the application of fiber-reinforced composite materials to topology optimization research can stimulate the research value of the material,People are also more challenging and tempting.However,traditional optimization-based design methods are more based on continuum,and less research on common rod structures.There is discontinuity between the fiber laying units,the structural geometry cannot be clearly expressed,and it is difficult to combine manufacturing with existing processes.In response to the above problems,we must first choose a new topology optimization method—movable deformable component method,which can accurately express the geometric information of the structure,has few design variables,and can be seamlessly connected with the CAD system.In the above topology optimization problem,the design variable of the fiber winding angle is added to combine the topology optimization with the fiber material,and the precise fiber layup process can be used in manufacturing to solve the problems with traditional methods.For the above problems,we conducted the following research:1.Using the component model and fiber composite material in the MMC method.Design the two-dimensional and three-dimensional models of fiber winding,fully consider the problem of unclear fiber angle caused by the intersection of the moving members during the design process The structure meets the conditions,and each unit of the topological structure corresponds to a unique fiber angle.2.The two-dimensional model adopts the composite material laminate theory to analyze the structural stiffness,and verify the simple rods,and apply it to the bicycle frame design.A bicycle structure based on fiber-reinforced composite topology optimization is obtained.The three-dimensional model is also the same.The equivalent stiffness is used for calculation,and a one-bar and two-bar calculation is carried out.Then,based on the ideas of this paper,a set of process design is carried out for the aerospace engine load-bearing structure in combination with finite element software,which has certain reference significance to the actual project.