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TORSION - ME-3900(Word by kpj VILLANOVA UNIVERSITY...

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1 ME-3900 (1/17/01Word by kpj) VILLANOVA UNIVERSITY MECHANICAL ENGINEERING DEPARTMENT TORSION TEST I. Introduction The torsion test is employed to determine the physical properties of metals in pure shear. Direct or cross-shearing tests are used in commercial tests of rivet shear, perforator shear, etc. In practical applications other stresses are also present and failure is usually due to a combination of shear, bending, and axial stresses. In pin members, for example, we also have a bearing stress, a large bending stress, and possibly an axial tension stress, so that failure occurs due to a combination of stresses. Most machine elements, that are primarily torsion transmitting members, are also subjected to flexure stress, or axial stress in tension or compression which contribute appreciably to the magnitude of the resulting shear stress. It is important to study the behavior of materials in pure shear in order to carry out the complete analysis. In this test, the modulus of rigidity, the yield stress and the ultimate shear stress will be determined. The experimenter must recognize that various types of forces produce shear stress. A shear stress acts parallel to the plane while an axial stress or flexure stress acts normal to the plane. Several types of shear are indicated below with some comments on the general behavior.
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