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Study of void growth and coalescence in HDPE material: a numerical investigation using computational voided cells

Cherief M. N. D., Benguediab M., Elmeguenni M., Reffas A.

Mechanics and Mechanical Engineering

2017

Vol. 21, nr 3

467--483

This paper presents a study about the effects of initial porosity and stress triaxiality on void growth and coalescence in High-density polyethylene (HDPE) material. Two approaches are used to modulate the representative material volume: The first one is a unit cell with a spherical void at the center (Voided cell model), and the second is a unit cell containing the same void fraction of volume and obeying to the constitutive relations of Gurson-Tvergaard-Needelman (GTN model). Detailed analyses of finite element gave us: the equivalent stress-strain response, the void growth and coalescence behavior of the representative material volume. Results show that the stress triaxiality and the initial void volume fraction are strongly effective and depended on.