In the recent situation where the application areas to the elastomers (rubber-like elastic materials）is increasingly expanded and their more frequent utilization is found out, demands are growing for their more information on strength, fracture characteristics, wear resistance and fatigue resistance. As many studies have already been conducted on their tensile strengths and tensile energies, no study has at present been found out on their fracture characteristics nevertheless its undoubted importance. Under such aspect, a fundamental research is executed in the present paper on three types of the elastomer materials comprising, polyurethane rubber, using the fine dot methods to clarify characteristics and the materials evaluations of the elastomer materials and obtain their deformation behaviors and fracture processes. This paper, however, discusses that the crack opening displacement can be an important parameter for quantitative evaluation of strength characteristics of the elastomers.
