复杂温度环境下苯基硅橡胶减震垫服役寿命评估技术

Technology for Service Life Assessment of Phenyl Silicone Rubber Damping Pads in Complex Temperature Environment

目的评估某型苯基硅橡胶减震垫在库房贮存-户外值班交替复杂温度环境下的服役寿命。方法开展苯基硅橡胶减震垫在不同温度下的热空气加速老化试验,测试压缩刚度性能数据,计算库房贮存-户外值班环境下多个等效温度反应速率,评估苯基硅橡胶减震垫服役寿命。结果在置信度为99%时,苯基硅橡胶减震垫的压缩刚度保持率均随老化时间延长呈修正指数型变化规律,初期变化速率快,后期变化速率减缓;随着温度增加,交联密度增加,减震能力降低。结论基于范霍夫近似规则,计算苯基硅橡胶减震垫在库房贮存-户外值班交替环境下的服役寿命为28年,为类似产品的使用寿命预测提供方法支撑。

The work aims to evaluate the service life of a type of phenyl silicone rubber damping pad under the complex temperature environment of alternating warehouse storage and outdoor service.Thermal air accelerated aging tests of phenyl silicone rubber damping pads were conducted at different temperature to obtain the data of compression stiffness performance and calculate the reaction rate of multiple equivalent temperature in the warehouse storage-outdoor service environment to evaluate the service life of phenyl silicone rubber damping pads.At a confidence level of 99%,the retention rate of compression stiffness of the phenyl silicone rubber damping pads showed a modified exponential variation law with extended aging time,with a fast initial variation rate,and a reduced later variation rate.As the temperature increased,the crosslink density increased,reducing the damping capacity.Based on the Van't Hoff rule,the calculated service life of the phenyl silicone rubber damping pads in the alternating environment of warehouse storage and outdoor service is 28 years,providing methodological support for the service life prediction of similar products.