(Received 15 April 1987; accepted 22 October 1987)
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The apparatus described herein is designed for the performance of biaxial stretching tests on flat cross-shaped specimens. It can be used with a conventional uniaxial tensile testing machine. The device converts the machine from one that exerts a uniaxial force to one that applies a system of forces in two perpendicular directions. A fixed value of the logarithmic strain ratio ρ = ϵ2/ϵ1 can be imposed on the test specimen along these two directions. The fixed ρ-value may be chosen between 0 and 1 according to the geometrical configuration of the device.
Professor, Université de Metz, Laboratoire de Physique et Mécanique des Matériaux, U.A.C.N.R.S. 1215, Faculté des Sciences, Metz Cédex,
Post-Doctoral Assistant, Faculté des sciences appliquées, Université de Sherbrooke, Sherbrooke, Québec
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