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The aim of this work is to know more about the underprediction of
springback in numerical simulation of sheet metal forming. There
are a lot of factors which influence the accuracy of springback
with numerical simulation.One factor responsible for the inaccurate
springback prediction is the assumption of constant Young's modulus
in FE analysis. Young's modulus, however, is found to decrease
during plastic deformation. Therefore, an accurate model is needed
to be implemented in FE analysis which can predict the decrease in
Young's modulus. With passage of time, Young's modulus is found to
restore to its initial value. The present study focuses on this
aspect of springback prediction. Bake Hardenable (BH) steel has
been selected to investigate the degradation and recovery in
Young's modulus. The decrease in Young's modulus and its recovery
has been measured experimentally by two methods i.e. the dynamic
method (Impulse Excitation Technique) and a static method (Tensile
Test).
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