炭黑增强对橡胶复合材料温度相关力学行为的影响

On the Influence of Carbon Black Reinforcement on the Temperature-Dependent Mechancal Behvaiovr of Rubber Composite

利用含温度箱的自动网格法测试系统,对不同炭黑含量的橡胶复合材料开展不同温度下的超弹性性能试验,考察了炭黑增强对其温度相关力学行为的影响。结果表明,温升过程中炭黑颗粒对橡胶基体的增强作用在逐渐减弱,与之相关的内能弹性效应也逐渐减小,加上橡胶基体本身的熵弹性效应,这两者共同决定了炭黑增强胶料会随着温度的升高"先变软后变硬",而非如纯胶料般随着温度的升高直接变"硬"。换言之,温度变化对颗粒与基体间相互作用造成的影响,使得炭黑增强橡胶的温度相关力学行为比不含炭黑的纯橡胶更为复杂。另外,依据试验研究的结果,本文还推导了修正八链模型的温度相关显式表达式,它能较好地表征胶料超弹性力学行为与温度的相关性。

Applying an oven testing system with automated grid,hyper elasticity experiment of carbon black reinforced rubber composite with different carbon contents was conducted at different temperatures.The effect of carbon black reinforcement on its temperature dependent mechanical behavior was explored. Experimental results demonstrate that with temperature rising,the reinforcement effect of carbon particles on rubber matrix gradually decreases,and the related＂internal energy elasticity＂effect also gradually decreases.Taking into account the＂Entropy elastic effect＂of rubber matrix itself,both factors result in carbon black reinforced rubber composite first softening then hardening with temperature rising,which is different from pure rubber.In other words,the temperature dependent mechanical behavior of carbon black reinforced rubber composite is more complex than that of pure rubber,due to the effect of temperature on the interaction between carbon particles and rubber matrix.Besides,based on experimental results,the modified temperaturedependent explicit expression of 8-Chain model was derived,which better characterizes the relativity between rubber hyper-elastic behavior and temperature.