Calibração do modelo de Drucker-Prager/CAP para simulação numérica do processo de prensagem a frio de pós metálicos
Resumo
An experimental procedure for the calibration of Drucker-Prager/Cap model, using
the digital image correlation technique, is presented. The elastic properties were
characterized by fitting stress vs. strain curves recorded during loading and unloading
cycles in a uniaxial compression test. The plastic material parameters, for
yield surface, have been obtained by uniaxial and diametral compression tests.
The calibration procedure was performed for three green density values. The digital
image correlation technique proved to be of great value in the analysis of
this results, considerably increasing the amount and quality of data obtained from
mechanical tests, allowing a more complete and accurate analysis, as well as a
greater understanding of the yielding mechanisms. The calibrated material model
was implemented into AbaqusTM v6.14 for a finite element analysis of cold
uniaxial compaction. An experimental procedure was used to validate the overall
method by comparing the finite elements results to the experimental observations.
The numerical results are in good agreement with the experimental observations.