Silicone rubber is a widely used polymer material. It often bears impact loads during use. The influence of strain rate on the tensile mechanical behavior of silicone rubber is of great value in engineering practice. The automatic grid method strain measurement technology and the Instron-E3000 material testing machine were used to conduct uniaxial tensile testing on the silicone rubber with a strain rate of 0.001 s–1; the silicone rubber was tested on the hydraulic servo medium strain rate material testing machine with a strain rate of 15 Uniaxial tensile test of s–1; based on the separated Hopkinson tie bar (SHTB) experimental device, a dynamic tensile testing technology suitable for low modulus and low wave impedance materials is developed to achieve the strain rate of silicone rubber. Uniaxial tensile test at 350 s–1 and 1 400 s–1. Uniaxial tensile test results of silicone rubber at different strain rates show that the tensile mechanical behavior of silicone rubber has obvious nonlinear elasticity and strain rate sensitivity characteristics. As the strain rate increases, the modulus and elongation of the material decrease. The long-term stresses all show an increasing trend and show positive correlation characteristics with strain rate.
The aging resistance and storage life of fluorosilicone materials were evaluated using the hot air accelerated aging test method and based on the Arrhenius equation. Test results show that the compression permanent deformation performance of fluorosilicone materials is most sensitive to thermal aging. When the service temperature is 60°C and the aging performance index is a critical value of 0.6, the service life of fluorosilicone is 12 years.
Fluorosilicone is widely used in aerospace, automobiles, machinery, petrochemical and other fields. For example, it is used as dynamic and static sealing materials in aircraft hydraulic systems and lubrication systems; as sealing materials in oil fields, cable pipelines and drilling equipment in oil fields; in the chemical industry, it is used as linings or resistant materials for equipment, pipeline flexible connections, pumps, etc. Corrosive sealing materials, made into pipes, used to transport organic solvents or other corrosive media, etc.
A hot air accelerated aging test was conducted on fluorosilicone to study the changes in the tensile strength, elongation at break, and compression permanent deformation retention of fluorosilicone at different temperatures with aging time and aging temperature. The study found that fluorosilicone exhibits non-Arrhenius behavior when taking tensile elongation at break and compression permanent deformation as performance change indicators. The reasons why fluorosilicone exhibits non-Arrhenius behavior were studied through dynamic mechanical thermal analysis. reason. The results show that the aging mechanism of fluorosilicone is mainly based on initial cross-linking and later degradation at lower temperatures; degradation is the main mechanism at higher temperatures. When elongation at break and compression permanent deformation are used as performance indicators, the service life of fluorosilicone is 37.1 years and 5.3 years respectively.
Low pressure variable fluorosilicone compound
