Research On Stamping Formability Of Thermoplastic Plain Woven Composites

Automobile lightweight is one of the most effective ways to achieve energy saving and emission reduction for the sustainable development of the automotive industry.Replacing traditional materials with lightweight,high-strength composite materials has become an important measure for the automotive industry.Fiber reinforced thermoplastic composites have been widely used due to their fast forming speed,good toughness and recyclability.The stamping forming of thermoplastic composites,as a potential rapid prototyping,has been preliminarily studied by some scholars.However,there are still many problems and laws that are not clearly described.Therefore,in order to explore the stamping forming performance of thermoplastic composites,this paper studies from the perspective of experiment and numerical simulation,and the main research contents are as follows:(1)The influence of the material type and fiber orientation on the formability of two kinds of CFRTP and CGRTP materials was studied.The typical failure modes and laws of the thermoplastic composites in the forming process were revealed,and the corresponding forming limit curves(FLC)were established.(2)The VUMAT subroutine was developed based on the ABAQUS/Explicit finite element dynamic analysis module.The non-orthogonal hypoelastic constitutive model was written in the subroutine,and the accuracy of the subroutine and the model was verified by the test.(3)The finite element simulation of the experimental model was carried out based on the numerical simulation method,including the off-axis tensile test and the stamping forming experiment.By embedding the non-orthogonal hypoelastic constitutive model in the VUMAT subroutine and the FLC failure criterion,the experimental data curve,the forming depth and the failure area were compared with the simulation,and the results were in high agreement.In summary,this paper was mainly based on the experimental and numerical simulation methods to study the forming performance of the thermoplastic composites.Through the study,it was found that the fiber orientation and material types play an important role in formability of the materials.By developing the non-orthogonal hypoelastic constitutive model and establishing a uniform forming failure limit criterion,it can be well applied to numerical simulation,which lays a good foundation for further research of thermoplastic composites.