Evaluation of Thermal Endurance Characteristics Using Time Dependence of the Compression Dynamic Modulus of Industrial Hoses

For evaluation of thermal endurance in industrial hoses, the temperature and time dependences of the compression dynamic modulus of two industrial hoses were investigated by dynamic viscoelastic measurements. In a certain temperature range, the compression dynamic modulus of each industrial hose lessened gradually with time, presumably due to a relaxation phenomenon accompanying some heat deterioration. The logarithm of time t, at which the compression dynamic modulus fell to 50% of its initial value, has been found to be two linear functions of the reciprocal temperature T-1.