CoA. Notes: Materials (1963-1969)
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Browsing CoA. Notes: Materials (1963-1969) by Author "Hall, M. M."
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Item Open Access A fracture of rubber in a state of finite torsional shear(College of Aeronautics, 1969-01) Hall, M. M.; Sollars, A. R.A solid rubber cylinder with metal end plates fractured in the rubber when a torsional deformation was applied 'which corresponded to a shear angle of 56° on the cylinder surface. The height of the cylinder was maintained accurately constant during the deformation. A comparatively smooth fracture surface was created in a direction perpendicular to the principal tensile stress and a rough surface was created perpendicular to the principal compressive stress. The markings on the smooth surface have some feature similar to a cleavage-type failure in a crystalline material.Item Open Access The pressure distribution over the flat end surfaces of compressed solid rubber cynlinders(College of Aeronautics, 1968-07) Hall, M. M.The shape of the pressure distributions over the flat end surfaces of compressed solid rubber cylinders have been determined. The cylinders were compressed between metal end plates. The pressure distribution for compressive strains of less than 3% is approximately parabolic. It is unaffected by the strains set up in the rubber due to the differential thermal contraction of the rubber and bonded metal end plates. A. method of extending these measurements to large compressive strains, and a possible future programme of work, is outlined.Item Open Access Studies of pure homogeneous deformations in unfilled natural and butyl rubbers(1968-04) Hall, M. M.Observed deviations from the kinetic theory of rubberlike elasticity have been reviewed, and particular attention focussed upon the Mooney parameter C2. Stress measurements have been made upon thin rubber sheets in a state of pure homogeneous biaxial strain, and the stress relaxation behaviours of a natural rubber and a butyl rubber are reported … [cont.].Item Open Access A study of the stress distributions necessary to maintain rubber in a state of torsion(College of Aeronautics, 1968-06) Hall, M. M.Quantitative measurements have been made of the time dependent normal stress distributions and torques which are necessary to maintain a state of torsion in: (i) a solid right circular cylinder of rubber, (ii) rubber contained between a cone and touching flat plate. The measurements on the solid rubber cylinder, under quasi-elastic conditions cannot be described by the kinetic theory of elasticity. There are considerable experimental difficulties involved in measurements on the cone and plate system but these results also suggest an inadequacy in the ability of the kinetic theory to describe finite deformations in rubbers.