Finite Element Modeling to Determine the Strain Rate Variation for Non-Viscous Deformation of HDPE During the Necking Process
The IUP Journal of Mechanical Engineering, Vol. VII, No. 2, May 2014, pp. 7-27
Posted: 7 Jul 2017
Date Written: October 30, 2014
Deformation for High Density Poly Ethylene (HDPE) and its stress response are measured during the necking process at the crosshead speed of 5 and 100 mm/min. Since necking in HDPE is known to involve a significant amount of creep deformation, the measured strain is generated from non-viscous deformation and creep deformation. It is the former that induces the stress response, not the latter. Therefore, it is important to determine the strain rate for the former to quantify the effect of the strain rate on the stress response. In this study, finite element modeling is used to extract non-viscous strain from the total strain during the necking process of HDPE. The results suggest that the range of strain rate for the non-viscous deformation can be reasonably represented by the strain rate measured experimentally based on the total strain, even though a significant amount of creep deformation occurs during the necking process.
Keywords: Necking, FEM, High Density Poly Ethylene (HDPE), Strain rate
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