| 摘要: |
| 弹热制冷是由应力场驱动弹热材料相变而产生制冷效应的固态制冷技术。天然橡胶由于价格低廉，弹性模量较小备受关注。本文在0℃以上的环境温度对硫化天然橡胶进行拉伸-加捻-解捻-回缩循环消除Mullins效应，并在环境温度为-30~40 ℃范围内对消除了Mullins效应的天然橡胶进行循环加载，采用红外热像仪记录循环过程中天然橡胶的温度变化，研究温度对天然橡胶扭拉热效应的影响。结果表明：增加加捻-解捻过程天然橡胶的温度变化大于单纯拉伸-回缩过程天然橡胶的温度变化，环境温度为-20 ℃时橡胶的低温结晶特性导致温度变化最大，卸载过程温降达到-41.3 ℃。 |
| 关键词: 固体制冷 天然橡胶 热效应 结晶 |
| DOI： |
| Received:May 17, 2021Revised:September 04, 2021 |
| 基金项目:天津市高校科技发展基金项目（2017KJ172）资助。 |
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| Analysis of Torsional Tensile Thermal Effect of Natural Rubber at Different Temperatures |
|
Yang Meng, Liu Bin, Zhu Zongsheng, Cai Mao
|
| (School of Mechanical Engineering, Tianjin University of Commerce) |
| Abstract: |
| Thermoelastic refrigeration is a solid-state technology that produces a refrigeration effect by driving the phase change of thermoelastic materials with a stress field. Natural rubber has attracted much attention because of its price and low elastic modulus. In this study, vulcanized natural rubber was subjected to a stretching-twisting-untwisting-retraction cycle at an ambient temperature above 0 °C to eliminate the Mullins effect. Natural rubber with the Mullins effect was subjected to cyclic loading in the ambient temperature range of -30–40 ℃. The temperature change of natural rubber during the cycle was recorded using an infrared thermal imager to explore the influence of temperature on the torsional tensile thermal effect. It was found that the temperature change of natural rubber during the twisting-untwisting process is greater than that in the simple stretching-retraction process. The temperature change is the highest due to the low-temperature crystallization characteristics of rubber at an ambient temperature of -20 ℃. The temperature during unloading reaches -41.3 ℃. |
| Key words: solid refrigeration natural rubber thermal effect crystal |
