Constitutive Modeling Of Acrylonitrile Butadiene Styrene Material In Fused Deposition Modeling And The Application

Additive manufacturing technology transforms a mass of raw material into the desired shape based on the digital models through a layer by layer process,which provides an effective solution for the manufacture of complex models and irregular structure designed from topological optimization.In recent years,additive manufacturing technology has been used in more and more fields due to its low molding cost,short design and manufacturing cycle and ability of manufacture complex parts.Fused Deposition Modeling(FDM)is the most widely used additive manufacturing technique.FDM additive manufacturing requires that the molding material are the thermoplastic materials which have the characteristics of low molding temperature,good fluidity,such as ABS and PLA.Due to the excellent performance of ABS materials in mechanical properties and processing,it is important to research ABS part fabricated by FDM for industrial application of additive manufacturing technology.The reform of manufacturing technology makes the constitutive model for material fabricated with traditional processes no longer applicable.The correct constitutive model can make the results of simulation and optimization of the printed parts more credible,so it is particularly important to study the constitutive model.However,there are limited studies on the constitutive model and simulation optimization of part fabricated by FDM.In this paper,the constitutive model of ABS part fabricated by FDM is studied.A combined numerical-experimental validation of the proposed model is conducted.The constitutive model is used to optimize the design of the steering wheel of the car.The content of this article can be divided into five parts:1)The hypothesis is proposed for the constitutive model of ABS part fabricated by FDM.Considering the characteristics of FDM additive manufacturing,anisotropic constitutive hypothesis of part fabricated by FDM is proposed.The polar anisotropic elastic model and Hill yield constitutive model are proposed to fundamentally describe the mechanical behavior of the FDM printed ABS part.2)The tensile tests are carried out to verify the anisotropy of constitutive model.During the printing process,samples of different material directions are obtained by put the samples with different angles.Design and complete the tensile tests for five different printing angles of 0 degree,30 degree,45 degree,60 degree and 90 degree.The experimental results show that the elastic modulus and yield strength of the sample increase with the printing angle,and the anisotropy of the part fabricated by FDM is obvious.3)The elastic constants of transversely isotropic and the anisotropic parameters of Hill yield criteria are solved.The experimental data are obtain to calculate the material parameters.4)The ABAQUS software is applied to simulate tensile experiments and to verify the effectiveness of anisotropic constitutive model.The elastoplastic material parameters of anisotropic constitutive model which obtained through experiment are used in simulation.Comparing with the experimental results,the simulation results show that the constitutive model propose in this paper can predict the elastic modulus and yield strength well.5)The additive manufacturing technology is combined with topology optimization to realize the topology optimization design of the steering wheel.The constitutive model propose in this paper is used to carry out the topology optimization design of steering wheel.