剪切增稠胶剪切条件下的粘弹性能及其力学性能改性

摘要

采用流变仪测试剪切增稠胶(STG)的力学性能,分析其粘弹性与防护性能的对应关系.由应变扫描及其相应的滞回曲线分析表明应变幅值2%为STG线性到非线性转变临界应变点.由频率扫描得到随着扫描频率的增大,STG由类液态变为类固态,临界转换频率为7 Hz,在液固转换区域STG具有优异的能量吸收能力.使用无机粒子(CaCO3、SiC、ZrO2)对STG进行改性.测试相同粒子不同质量分数、相同质量分数不同粒子的粘弹性及其相应的滞回曲线,分析表明CaCO3在力学性能改善方面具有明显优势.%In this paper,the mechanical properties of shear-thickening gel were tested by the rheometer, and the relationship between viscoelastic and safeguarding performance was analyzed.By means of strain sweeping, the hysteretic curves showed that the strain amplitude of 2% was the critical strain point for linear to nonlinear transformation of materials.Frequency sweeping showed that with the increase of frequency, STG transforms from liquid-like to solid-like.In the liquid-solid transition region, STG has excellent energy absorption ability at the critical frequency of 7Hz.In the aspects of material modification, three kinds of inorganic particles (CaCO3, SiC, ZrO2) have been used for STG modification.Through the hysteresis curves of the same particles with different mass fraction and the mass fraction of different particles in terms of material modification analysis, CaCO3 has obvious advantages in mechanical performance improvement.