| 摘要 |
The present invention refers to a device for equiaxial testing in elastomer materials and the method for using the same, where a circular-shaped membrane is placed at the upper portion of an aluminium cylinder, which lower end portion is sealed; the membrane is pressed against the cylinder at the periphery thereof by a ring like cap. A gasket is located between the membrane and the cylinder in order to assure the sealing of the pressure chamber and avoid damages of the thin layer of material with metallic edges. The cylinder is innerly injected with filtered and dry air for avoiding alterations of the elastomer, the air being led to the inner portion of the cylinder by means of control elements so that the generated pressure inflates the membrane, this provoking a deformation state in the material, which is best known as equiaxial deformation; once the maximum desired pressure is acquired or the highest deformation, the membrane would be deflated up to the zero pressure condition; sai d device is intended to determine the elongation of the material, taking as reference marks located at the central portion of the material, considering the curvature radius by removing measurement errors, this being attained by only recording the curve projection; the changes are recorded in the profile of the deformed sample.
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