(Received 22 November 1985; accepted 2 September 1986)
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This paper proposes a new bending method using a computer to obtain a modulus of elasticity of plastics close to those given by tension methods. In the new method, a beam is freely supported at its ends on spherical surfaces. A load of constant weight on the beam travels from one support to another, and the displacement of the undersurface of the beam is measured at a certain distance from a support. The modulus of elasticity is obtained so that the (loading) position-displacement (of a point on the beam) curve expressed by the equation of displacement of the beam, which is a function of the modulus, will best fit the experimental displacements.
An equation is proposed for the displacement with terms including beam deflection and a quantity proportional to load travel, and a method to calculate the modulus from the experimental displacements is given. Finally, the experimental system with the testing machine and the good results of the experiments are shown.
Professor, Ritsumeikan University, Kyoto,
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