Combining displacement, strain, temperature and heat source fields to investigate the thermomechanical response of an elastomeric specimen subjected to large deformations

Abstract

International audienceCombining thermal and kinematic full-field measurements at the same time is gaining widespread acceptance in the community involved in the thermomechanical characterization of materials. However, obtaining such attractive information in the case of elastomers for which large deformations occur raises specific experimental issues which are addressed in this paper. The problem arises in mapping both the thermal and the kinematic quantities in the same reference coordinate system in order to write properly the heat diffusion equation. This equation provides heat sources which constitute a relevant quantity in the framework of thermomechanics. The procedure is presented and the underlying practical difficulties are detailed. It is then applied in the case of a specific test performed on a so-called three-branch specimen. Finally, the obtained strain and heat source distributions are briefly discussed

Infrared thermography coupled with digital image correlation in studying plastic deformation on the mesoscale level

“…Here it is worthy to note that, except the method developed in the present study, there are also other kinds of displacement compensation methods that are adequate for performing the spatial alignment. The interested readers can be referred to the references [30][31][32]36,37] for detailed information.…”

“…For performing such a thermalkinematic coupled measurement, different technical solutions have been proposed. They can be classified into two groups according to their experimental set-ups: namely single-face measurement [20][21][22][23][24][25][26] and two-face measurement [27][28][29][30][31][32]. The first experimental configuration refers that both IR camera and visiblelight camera observe the same face of the specimen.…”

“…On the aspect of the application, the full-field measurements have been extensively applied to the mechanical testing and evaluation of the metallic materials and elastomers [30][31][32]36,37]. They show particular values in characterizing the heterogeneous deformation process of materials, which can be embodied both in the thermal and kinematic fields [38][39][40][41].…”

Thermomechanical analysis of the crack tip zone in stretched crystallizable natural rubber by using infrared thermography and digital image correlation

“…[12] using only thermal fields, then was improved in Ref. [17], using both kinematic and thermal fields. The methodology employed for this latter method is briefly recalled below.…”

“…We highlighted the calorimetric signature of various phenomena involved during deformation: entropic and isentropic elasticity [12], viscosity due to filler adding [13], SIC [14,15] and the Mullins effect [16]. Then we studied heterogeneous deformations by developing a new data processing methodology in the case of a large displacement of points at the observed surface [17]. This methodology was applied to the determination of the kinematic and thermal fields in the crack tip zone of filled styrene butadiene rubber (SBR) to evaluate the effects of the mechanical dissipation of the total heat source 1 : see Ref.…”