Characterization of heat sources in the crack tip zone in stretched NR and SBR rubbers

Jose Ricardo Samaca Martinez (1) , Xavier Balandraud (1) , Evelyne Toussaint (2) , Jean-Benoit Le Cam (3) , Daniel Berghezan (4)

1 IP - Institut Pascal
2 LASMEA - Laboratoire des sciences et matériaux pour l'électronique et d'automatique
3 IPR - Institut de Physique de Rennes
4 Manufacture Française des Pneumatiques MICHELIN

The study deals with the experimental characterization of heat sources produced in a crack tip zone of two types of carbon black filled rubbers: a Styrene Butadiene Rubber (SBR) and a Natural Rubber (NR). For this purpose, full thermal and kinematic field measurements were performed. In NR, crystallisation increases the stiffness in the crack tip zone and consequently decreases the maximum stretch ratio. For SBR specimen, the maximum stretch ratio level at the crack tip is higher than that measured at specimen failure during homogeneous uniaxial tensile tests. During loading, the maximum temperature change is lower in NR specimen than in SBR specimen. For both materials, the heat sources in the crack tip zone remain positive during unloading. This was not observed for homogeneous tests. This phenomenon is due to the very high mechanical dissipation production, and to crystallisation at the beginning of unloading in the case of NR.

Domaines: Mécanique des matériaux [physics.class-ph]

Jose Ricardo Samaca Martinez, Xavier Balandraud, Evelyne Toussaint, Jean-Benoit Le Cam, Daniel Berghezan. Characterization of heat sources in the crack tip zone in stretched NR and SBR rubbers. European Conference on Constitutive Models for Rubber IX, Sep 2015, Prague, Czech Republic. ⟨hal-01136551⟩