Surface Strain Distributions of Rubber Cylinders under Tension or Compression

概要

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Surface strain distributions of rubber cylinders with various shape factors and fillet radii are measured and the relation between these distributions and fatigue failure is considered. The experiment indicates that the major part of axial strain distribution of the specimen without a fillet is nearly equal to the applied strain and the surface strain increases near the bonded plane. In the case of a filleted specimen, the strain over the central region of distribution is different from the applied one and the strain concentration appears in both fillets and the strain reduces to zero near the bonded plane. The strain concentration factor is greater for smaller fillet radius and for larger shape factor, but the position of concentration is scarcely influenced by the shape of specimen. Furthermore, the changes of these distributions with the applied strain and the appearance of wrinkle under compression are described. The incompressibility of the specimens is also discussed.
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