较大变形范围内炭黑填充胶料超弹性力学性能温度相关性的实验研究

基于含温度箱的自动网格法试验系统,本文对不同温度下炭黑颗粒填充胶料的超弹性力学行为进行了实验研究.研究表明,填充胶料在较大范围内的超弹性力学行为存在着温度相关性,其特点是:胶料随着温度的升高而"先变软后变硬".在温度升至临界温度以前,胶料中分子热运动增强所导致的软化趋势占主导作用,所以胶料随温度升高而变软;当温度超过临界温度后,胶料的熵弹性效应占据主导作用,即胶料将随温度升高而变硬.研究结果还表明,修正八链模型可以较准确表征不同温度下轮胎胶料的超弹性力学行为.

Experimental Investigation on Temperature Dependence of Hyperelasticity of Carbon Black Particle-Filled Rubber within Moderate Finite Deformation

Based on the Automated Grid Method test system with environmental temperature box, the experimental investigation on the hyperelasticity of carbon black particle-filled rubber at different temperatures was carried out in this paper. Result demonstrates that the hyperelasticity of particle-filled rubber within moderate finite deformation is dependent on temperature. The rubber is softened first and hardened later along with temperature increasing. Before the environmental temperature rising to critical temperature, the stress-sorting process induced by intensification of molecule motion in rubber is predominant, so the rubber is softened with temperature increasing; when the temperature goes beyond critical temperature, the entropy hyperelasticity effect of rubber plays leading role, so the rubber is hardened with temperature increasing. The evaluation also Shows that the modified 8-chains model can characterize accurately the hyperelasticity of tire rubber at different temperatures.