Parametric Matching Design Of Lattice Structure For Application Scenario Inverse Drive

In order to meet the urgent needs of customized design and prototype manufacturing of micro-flexible tissue engineering scaffolds,the dual properties of lattice structure coupling function and structure were applied to regulate the dynamic response of functional indexes and structural parameters.And the reverse design concept of "functional demand-structural supply" was realized.Therefore,the main line of this project was the design mode of lattice structure "scenario driven-supply analysis-functional demand-structural design-process optimization".The mapping correlation model between the functional index and structural parameters of lattice structure was taken as the theoretical basis.And the derived lattice structure was taken as the research object.A reverse design method was proposed to invert the structural parameters according to the functional behavior of the application scene.Focusing on the controllability,accuracy and matching of lattice support design,the customized design and fabrication of flexible and elastic lattice support based on DLP technology was carried out.The details were as follows:(1)The lattice structure twin library was designed and the influence of DLP process parameters on the lattice structure morphology was investigated.Two topological derivation methods were proposed,the derived design of BCC cells was realized,and the corresponding cell family was constructed.By manipulating the attitude and layout of cell during periodic expansion,the multi-level construction of corresponding lattice structure was completed.A novel flexible and elastic photosensitive resin was prepared,and its mechanical properties were tested by simulation and experiment.The DLP forming technology was selected and its technological process was deeply analyzed.The optimal forming technological parameter combination of lattice structure was explored and prepared by orthogonal test,and the high precision and efficient preparation of lattice structure was realized.(2)The mapping correlation model between functional index and structural scale was created,and the compression response of structural sensitive parameters to lattice structure was analyzed.The dynamic relationship between structural parameters and lightweight index was established to evaluate the lightweight design degree of lattice structure.Taking Timoshenko beam as the bond,the response relationship between cellular structural parameters and the equivalent mechanical model was established.And the mapping mechanism between design parameters and the model was analyzed in focus,in order to explore the influence of shape parameters on the mechanical behavior of lattice structures.Simulation and experiment were used to prove the controllability and accuracy of the mapping model.In this paper,a lattice structure with variable density was proposed,and its compression response was analyzed by integrating deformation mode with energy absorption.(3)The single objective inverse design parameter seeking method and multi-objective concurrent design optimization method were proposed,and the customized case driven lattice support parametric design was realized.Using the created multidimensional evaluation index,the optimal cell category and its filling posture were mined.The constraints of the preparation process on the design of lattice support were deeply analyzed.The elastic modulus was taken as the functional index and the filling space of the application scene was taken as the dimensional constraint.The reverse design method was adopted to realize the design mode of "functional demand-structural supply" of lattice support.Aggregation lightweight,energy absorption and load-bearing behaviors were integrated.The multi-objective concurrent design method was used to explore the matching accurate optimization scheme and realized the customized design of lattice support driven by structural parameters.The design model proposed in this paper embodied innovative elements such as the transformation of lattice structure design thinking,the integration of development modules,and the role switch between users and designers.It made up for the disadvantages of the mismatch between lattice scaffolds and application scenarios.It improved the current situation of the lack of design methods and complicated manufacturing processes of lattice scaffolds.And It expanded the application of lattice structures to the field of biological soft tissue.To provide a new perspective for the development of skin tissue engineering scaffolds.