硅橡胶的动态压缩实验和力学性能研究

Research on Dynamic Compressive Testing and Mechanical Properties of Silicon Rubber

对一种改性硅橡胶材料进行了高应变率动态压缩的实验测试。实验结果表明,这种硅橡胶材料具有很强的应变率敏感性;在室温和高应变率下,表现出典型的聚合物粘弹性特性。实验中应用了入射波整形技术保证试样中的应力平衡及常应变率加载。利用石英晶体监测了试样两端的应力平衡,并应用石英测试技术测量了微弱的透射信号。

By use of split Hopkinson pressure bars (SHPB) technique,a kind of silicon rubber is investigated for understanding its dynamic constitutive behaviors at high strain rates.Experimental results show that silicon rubber is strain-rate sensitive.It shows viscoelastic characteristics at room temperature and high strain rates.Pulse shaping technique is utilized to ensure the dynamic stress equilibrium in the specimen and to obtain a constant strain rate.Quartz crystal is used to monitor the stress equilibrium and to measure the weak signal in the experiments of silicon rubber.