Abstract
The present paper deals with the volume variation in filled crystallizable natural (F-NR) and uncrystallizable styrene-butadiene (F-SBR) rubbers subjected to cyclic loadings. During their deformation, such materials exhibit volume variation induced by the cavitation phenomenon and the decohesion between particles and the rubber matrix. In this study, we propose to measure this volume variation over the first mechanical cycles by an original full-field measurement technique. First, results show that in both filled compounds no residual volume change is observed. Moreover, after the first cycle, the response of both compounds is stabilized in terms of volume variation. However, a hysteresis loop is observed only for the first cycle in F-SBR whereas it is observed for each cycle in F-NR. Finally, the measurement method allow us to highlight the influence of stress-induced crystallization on the volume variation.
Highlights
The deformation of rubbers induces a number of physical phenomena
This study investigates volume variation in rubbers under cyclic loading
Results show that volume variation under uniaxial tensile loading is a reversible processus during the first three cycles
Summary
Polymer chain extensibility and failure, the ability of certain elastomers to crystallize under stress (Trabelsi et al, 2003), decohesion between zinc oxides and the rubber matrix (Le Cam et al, 2004) and cavitation in the rubber matrix or/and at the filler aggregate poles (Ball et al, 1981; Diani, 2001; Gent and Lindley, 1958; Goebel and Tobolsky, 1971) seem to be the most significant These phenomena are classically studied at the macroscopic scale in terms of volume variation. The evolution of volume variation during the first loading cycles is discussed by comparing crystallizable and uncrystallizable rubbers
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