【摘要】 介绍了剪切增稠胶(STG)的研制,在不同温度条件下制备STG来探究STG性能。采用流变仪测试STG性能,分析不同压力下的蠕变―回复曲线,表明随着施加压力的增加STG具有较大的蠕变量,卸载应变后STG应变随时间基本不变;对STG进行频率扫描得到材料在外界高频率条件刺激下其储能模量增大了将近4个数量级,材料表现出了典型的剪切变硬性能;对STG进行振幅扫描,得到材料的线性极限为3%,该应变为材料从线性到非线性转变的临界应变点,对于大多数样品来说,在应变幅值扫描范围内G’始终大于G″,表明STG在整个形变范围内呈现出固态特性;对STG进行落锤冲击测试,对其力学行为进行了探讨,结果表明随着冲击速度的增大,STG的能量吸收系数变大60%,说明STG具有较好的能量吸收特性及良好的抗冲击性能。更多还原

【Abstract】 The preparation of shear thickening gel( STG) under different temperature conditions was introduced and the performance of STG was investigated. The rheometer was used to test the STG performance,and the creep-resilience curves under different pressures were analyzed. It was shown that the shear thickening gel had larger creep as the pressure increasing,and the STG strain was basically unchanged with time after unloading the strain. The frequency scan of the STG results showed that the material highfrequency stimulated storage modulus increased nearly four orders of magnitude,and the material exhibited typical shear hardening properties. And the amplitude scanning of the STG results indicated that the linear limit was 3%. The strain was the critical strain point of the material transition from linear to nonlinear. For most samples,G’ was always greater than G″ within the strain amplitude sweep range. It showed that STG exhibited solid state properties throughout the deformation range. The drop weight impact test was applied on the STG to obtain the mechanical performance. The results show that as the increase of the impact velocity,the energy absorption coefficient of the STG could increase to 60%. It indicates that STG has good energy absorption characteristics and good impact resistance.更多还原