抄録
A new type of biaxial tensile tester for flat plates has been produced, which can make uniform extention of a square plate in biaxial directions. The tensile mechanism of this tester consists of two servomechanism for the control of the position of the two travelling beams on which cramp chacks are mounted. These chacks are capable of easy travelling on the beam surface by means of ball bearings. By the use of this tester it is made possible to perform such testing as tensile testing, stress relaxation measurement, creep testing and fracture strength testing, under homogeneous biaxial stress states.
In this paper the mechanism of this tester is described, and the results of elastic property measurements of BR, SBR, and IR rubber sheets using this tester are reported. The load-elongation diagrams are obtained by this tester and energy function are calculated from it as a function of invarients I1, I2 of deformation tensor.
