变温下橡胶材料力学性能的实验分析

利用Zwick020材料试验机研究了天然橡胶材料在不同温度条件下单向拉伸的大变形力学行为。得到了不同温度和不同加载速率条件下材料的应力-应变关系曲线和材料的破坏条件,由此分析了高温和低温的温度变化条件及加载速率对材料力学性能的影响,得出天然橡胶材料在大变形条件下的温度和加载速率敏感特性。同时利用实验结果拟合出材料的应变能函数,并应用热超弹性模型对材料进行了理论分析。结果表明,理论分析结果与实验结果仅在一定温度范围内吻合得较好,因为材料软化或硬化,在很高或很低的温度情况下二者有一定差别。

Experimental Study of Natural Rubber Mechanical Property in Variable Temperature Fields

Under a uniaxial tensile loading and in variable temperature fields,taking into account large-scale deformation,mechanical behavior of natural rubber was studied by using a Zwick020 material test machine.Both stress-strain relation curve and rupture condition of the rubber were attained under different temperatures and different loading rates.The effects of higher and lower temperature and the effects of different loading rate on mechanical properties of the material were analyzed.The sensitivity of natural rubber related to both temperature and loading rate in large-scale deformation was examined.At the same time,strain energy function for the material was developed from the experimental results and theoretical analyse was carried out based on thermo-hyperelastic model.It shows that theoretical results accord with experimental results only in certain temperature ranges due to the material softening or hardening under high or low temperatures.