Collaborative Optimization Method Of Structure And Carrier For Self-healing Materials

As a kind of intelligent material,self-healing material has always been the focus and difficulty of research at home and abroad.In the view of macro point,self-healing materials as a kind of components need to bear certain mechanical properties.In the view of microscopic point,self-healing materials need reasonable quantity and arrangement of carriers to ensure the repair effect.Therefore,it is necessary to optimize the macrostructure and mesoscopic carrier of self-healing materials at the same time.Based on the framework of moving morphable components,this research proposes a study on the 2D collaborative optimization of self-healing material structure and microcapsules,and the 3D collaborative optimization of self-healing material structure and micro-pipes for the optimization of structure and carrier in self-healing materials.Taking the optimization of 3D MBB beams as examples,single-scale MBB beams(only considering the single-scale optimization of macroscopic structure)and dual-scale MBB beams(considering the collaborative optimization of macroscopic structure and mesoscopic carrier)are made.The collaborative optimization effect of self-healing material structure and carrier are verified.(1)2D collaborative optimization of self-healing materials and microcapsules.The research takes the overall structural flexibility as the objective function and the material volume as the constraint condition.Based on the framework of moving morphable components,a 2D mathematical model of the built-in microcapsule component is established.The correctness of the algorithm is proved by the short cantilever examples and the MBB beam examples.The study shows that compared with the single-scale optimization results,the dual-scale collaborative optimization results have the same structure under the same constraints and loads.The flexibility values have increased by 3.37% and 2.19% respectively.It shows that the dual-scale collaborative optimization with microcapsules can meet the requirements of structural mechanics and damage self-healing performance.It also realizes the integration of structures and functions.(2)3D collaborative optimization of self-repairing material structures and micro-pipe.The 3D collaborative optimization of self-healing materials and micro-pipes is based on the framework of moving morphable components.A 3D topology optimization component with built-in micro-pipes is established.The sensitivity of objective functions and constraint condition to each design variable is obtained by the chain derivation rule and multivariate function derivation.And the correctness of the algorithm is proved by 3D short cantilever examples and MBB beam examples.The study shows that compared with the single-scale optimization results,the dual-scale collaborative optimization results have the same structure under the same constraints and loads.The flexibility values have increased by 3.37% and 2.19%respectively.It shows that the dual-scale collaborative optimization with embedded micro-pipe can meet the requirements of structural mechanics and damage self-healing performance.It also realizes the integration of structures and functions.(3)Experimental research on collaborative optimization of self-repairing materials.The research takes 3D MBB beams as examples to verify the collaborative optimization effect of self-healing material structure and carrier.Single-scale and dual-scale 3D MBB beam models are prepared with epoxy resin as raw materials.The strains of two structures are measured by building the stress test platforms.The experimental results show that under the constraints and loads specified by the 3D MBB beam,the average mechanical performance of the dual-scale model reaches 91.315% of that of the single-scale model.