EFFECT OF COMBINED MECHANICAL STRESS AND SALT SPRAY AGING ON DYNAMIC FRICTION BEHAVIOR OF O RINGS

摘要

Rubber seals has become one of the key components in industry sealing devices. However, environment becomes more severe due to ocean application fields. Combined ageing of salt spray, high temperature and mechanical stress have a great influence on mechanical properties of rubber sealing materials, which leads the decline of rubber sealing performance [1-2]. The mechanical properties of rubber under salt spray aging have been studied by scanning electron microscopy and Fourier transform infrared spectroscopy [3]. The significant changes in tensile strength and elongation at break also indicate the severe degradation in air. Besides, finite element simulation was used to study the sealing contact stress, oil film thickness and surface roughness, molecular interaction between seal/rod interface [4-5].