Identification of non-homogeneous stress fields in dynamic experiments with a non parametric method

Ramzi Othman (1) , Souheila Aloui (1) , Arnaud Poitou (1)

1 GeM - Institut de Recherche en Génie Civil et Mécanique

Stress and strain fields are generally assumed homogeneous in high strain rate experiments. Therefore, only mean stress and strain are measured. However, this assumption is not valid for soft materials and/or very high strain rates. For heterogeneous dynamic tests, inverse techniques are usually proposed to identify the stress and strain fields. In this paper, a non-parametric method to identify the stress field is presented. This method is based on a force measurement on the specimen boundary and a displacement (strain) field measurement carried out by a digital image correlation technique. It is applied to measure the strain rate sensitivity of a synthetic rubber (Criblex 80). This new technique estimates the stress field with good accuracy.

Mots clés: Rubber; Dynamic equilibrium; High-strain rate; Soft materials; Digital image correlation

Domaines: Mécanique [physics.med-ph]; Matériaux

Ramzi Othman, Souheila Aloui, Arnaud Poitou. Identification of non-homogeneous stress fields in dynamic experiments with a non parametric method. Polymer Testing, 2010, 29 (5), pp.616-623. ⟨10.1016/j.polymertesting.2010.03.013⟩. ⟨hal-01006941⟩