| Energy absorption device has been mature application in numerous fields,so how to enhance the performance of energy absorption structure has become a topic of concern.This article is written on the principle of bionics analysis and modeling content.Based on the excellent energy absorption characteristics of the three-period minimal curved porous structure,the filling ability,combination and stitching ability of TPMS structure and its influencing factors were further studied.The content of the article involves the finite element analysis,experiment,optimization algorithm,theoretical analysis,structural design,comprehensive evaluation method and other aspects mainly have the following content.(1)The axial compression dynamic characteristics of TPMS-Filled structure were studied by experiments and finite element simulation.The effects of wall thickness T and aperture L of TPMS porous structure on the crashworthiness of TPMS-Filled structure were investigated.In the study,it was found that the two studied parameter variables(wall thickness T and aperture L)could greatly affect the values of SEA and PCF of the structure.Due to the interaction,the energy absorption and energy absorption efficiency of the packed structure were improved much more than the sum value of the separate structure.Then,we combined the genetic algorithm and the proxy model to optimize the parameter variables studied in this section to get the optimal Pareto front solution.The optimization results show that the FRD-filled structure has the best SEA value and the IWP-filled structure has the highest PCF value.(2)Based on the principle of bionic design,the crashworthiness of composite TPMS structure is studied.Firstly,the modeling method of composite TPMS structure is studied and introduced.Then,the nonlinear finite element analysis method is used to analyze the influence of the change of the ratio of the thickness of inner surface and the thickness of outer surface on the crashworthiness of composite TPMS structure.At the same time,the multi-index comprehensive evaluation method--CPA evaluation method is applied to optimize different structures.Finally,the formula of the average crushing force of the optimal ratio of Pi-type structure in compression was deduced,and the theoretical formula was obtained under the same and different thickness ratio V.The prediction of the formula was verified,and it was found that the verified value was in good agreement with the error value,and the prediction accuracy of the theoretical formula was high.(3)A functional bone-like structure is presented and the mechanical crashworthiness of the structure is analyzed by nonlinear finite element method.The article firstly introduces the bionic principle of the structure and then proposes a symmetric constraint model that can reduce the calculation time.In the next study,the symmetry constraint model is verified and is used for subsequent research.The article mainly studies the energy absorption effect of the number of induced grooves and the concave distance on the structure.Through the analysis and research on the deformation mode and the mechanical curve,combined with the CPA comprehensive evaluation method,we can generate a best optimal configuration.Finally,we select the optimal parameter area for this optimal functional multi-tube filling configuration and use genetic algorithm and proxy model to obtain an optimal structure within the parameter design range.The optimal design value is a combination of the relative density of 0.3523g/cm~3and the tube thickness of 0.7773mm. |
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