Surface Strain Distributions of Rubber Cylinders under Shear or Compressive Shear

Abstract

Surface strain distributions of rubber cylinders with various shape factors and fillet radii are measured and the relation between these distributions and fatigue rupture is considered. The obtained results are as follows : (1) In the axial strain distribution of the filletted specimen, there exist strain regions of tension and compression and also the strain concentration in both fillets. (2) The maximum surface strain is greater for smaller fillet radius and for larger shape factor but the position of concentration is scarcely influenced by the shape of specimen. (3) In the case of compressive shear, the tensile strain region decreases with the increase of compression and finally wrinkles appear on the compressive side of fillet. (4) The fatigue characteristics of rubber is explained qualitatively by so-called maximum shearing strain theory.