An approach for full-range true stress-strain curves of materials based on vic-3D technology and FEA method

摘要

The description of constitutive relationship of materials up to failure is very significant forstructure damage and large displacement assessment. The true stress-strain curves after neckingbecome unmeasured. Based on Vic-3D technology and finite element analysis, the complete deformationprocess of a funnel tensile specimen was well tested and simulated. Therefore, a newmethod to obtain the full-range constitutive relationship of materials was developed. The finiteelement simulation (FES) results for the funnel specimens show that, the simulative load versusdisplacement curve, diameter at the funnel root versus displacement curve, funnel deformationcontours even the simulative strain field on the surface of the specimen are closed to the testingresults. In addition, the parameters of the constitutive relationships, failure stress and strain forthe testing materials when the specimens failed are given.