Temperature-dependent ratcheting of PTFE gaskets under cyclic compressive loads with small stress amplitude

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• 作者：Xiaotao Zheng ; ^{xiaotaozheng@163.com} ; Xiang Wen ; Jiuyang Gao ; Jiuyang Yu ; Wei Lin ; Jianmin Xu
• 关键词：Ratcheting ; Temperature-dependent ; PTFE gaskets ; Compressive loads ; Creep
• 刊名：Polymer Testing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：57
• 期：Complete
• 页码：296-301
• 全文大小：1541 K
• 卷排序：57

文摘

Uniaxial stress-controlled ratcheting experiments on PTFE gaskets under cyclic compressive loads with small stress amplitude were performed. The effect of temperature on the deformation behavior was considered. Results showed that the compressive modulus decreases rapidly when the temperature increases from 100 °C to 200 °C. Compressive ratcheting deformation with cycles increase significantly with the increases of temperature. The ratcheting deformations at 100 °C, 150 °C and 200 °C are nearly two, three and five times that at room temperature, respectively. Most of ratcheting deformation mainly occurs during the first 20 cycles because the subsequent ratcheting rate and strain range are small and much less than those in the previous cycles. The accumulated deformation under cyclic loads with small stress amplitude is relatively approach to the static compressive creep with the same peak stress. Therefore, the accumulated deformation with time of PTFE gaskets obtained by cyclic compression with small stress amplitude can be estimated by the corresponding static creep deformation with good accuracy under the approximate stress rate and the same temperature, especially at room temperature.