红外热成像仪同步跟踪橡胶弹性体材料的循环形变过程,几种特殊的热效应特征能被观察到:(1)拉伸时明显的热弹转变效应,即橡胶试样在拉伸时要经历一个明显的温度降低,然后温度才逐渐升高;(2)试样初始拉伸-回复时,温度变量具有部分可逆性,而随后的拉伸-回复温度变化几乎完全可逆;(3)拉伸时温度升高具有速率依赖性,即拉伸速率越快,温升越高.热效应特征能反映形变分子聚集结构的变化,显然,橡胶的受力形变过程除构象变化以外,还具有其它特殊的分子结构变化.
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