ABAQUS Program Development On Constitutive Model Of TC18 Titanium Alloy Under High Temperature And Impact Load

At present,TC18 alloy,which is widely used in various high-bearing components in the aviation field,will inevitably bear the impact during its practical use,so it is necessary to study its dynamic mechanical properties.TC18 alloy has the characteristics of high strength and high toughness,so it is difficult to study its dynamic mechanical properties.Finite element simulation is convenient and easy to operate,but its accuracy needs to be improved.The ABAQUS standard Johnson-Cook constitutive model can't meet the requirements of the simulation accuracy of high strength and high toughness materials such as TC18 alloy.This paper uses the good openness of ABAQUS to develop its constitutive model material library in the form of code.This paper using the Jia Baohua's modified J-C constitutive model fitted by TC18 SHPB experiment data,utilizing the user subroutines in ABAQUS and based on basic mechanics theories and principles of ABAQUS secondary development,has written UMAT user material subroutine,named as URTICMS,and VUMAT user material subroutine,named as VHTICMS,so the dynamic mechanical properties of TC18 alloy are simulated more accurately.The simulated data that ABAQUS calls the subroutine developed in this paper have been compared with experimental data,and the error of the simulated data have been quantified using Average Absolute Value of Relative Error(AARE).The standard J-C constitutive equation parameters have been fitted by the same experimental data,then the same finite element model was simulated by ABAQUS and the AARE of it was calculated.By comparing the simulation AARE of two constitutive models,this paper have quantitatively proved that the user material subroutine developed in this paper can better characterize the dynamic mechanical properties of TC18 alloy than the standard J-C constitutive equation.In this paper,the subroutine VHTICMS is applied to the simulation analysis of practical engineering components.A 3D finite element model of TC18 alloy landing gear diagonal brace have been built in ABAQUS/CAE.The subroutine VHTICMS was called by ABAQUS to simulate the dynamic mechanical properties of this model under high strain rate,which can provide reference for the engineering structure design of TC18 alloy,and lay a foundation for the wide application of TC18 alloy in aerospace and other fields.