ABSTRACT
The aim of this study is to improve the description of the fields of dissipated energy at low scales thanks to temperature measurements. A specific experimental set up and a dedicated protocol to characterize the local dissipation gradients have been developed and formerly validated on structural samples at the macro-scale (Marco et al. 2014, Masquelier et al. 2015). Here, this protocol is firstly applied at the microscopic scale on two specific geometric defects (a hole and a rigid area). Then the protocol is applied to describe the dissipation fields and the failure mechanisms for the three
1 INTRODUCTION
The fatigue properties of elastomeric parts against fatigue are strongly related to the microstructure features because these reinforced materials are heterogeneous. The industrial development of materials resistant to fatigue is therefore very complex because the variable parameters are incredibly numerous, including the original ingredients and the processing parameters, from mixing to injection and curing. The understanding of the fatigue behaviour requires both the description of the thermo-mechanical response and of the microstructure. De-spite very interesting data, these approaches are usually considered separately, with accurate description of the microstructure and of the initiation sites’ morphology on the one hand (Gent and Park 1984, Le Cam et al. 2013, Le Saux et al. 2011, Legorju-Jago 2012, Huneau et al. 2013) and of the thermo-mechanical response on the other hand (Mars 2001, Saintier et al. 2006, Le Saux et al. 2010, Marco et al. 2013). Some recent studies tried to
typical microstructural cases, i.e. break of the inclusion, cavitation between two close inclusions and interface failure at the poles of the inclusion. Filled NR and SBR materials are considered.
