对钠钙硅玻璃在物理钢化和化学钢化前后的动态弹性模量、剪切模量、泊松比进行了研究.利用脉冲激励法测试玻璃的弹性性能,分析了2种钢化工艺对玻璃弹性性能的影响.讨论了钢化对玻璃力学性能变化的影响机理.试验结果表明,玻璃的弹性模量与其钢化后有较为明显的差别,物理钢化使其弹性模量比原片玻璃略有降低(约4%),而化学钢化玻璃使其弹性模量较原片玻璃有所提高(约6%),这一奇怪的现象是由于物理钢化过程中玻璃冷却后,内部的收缩要大于表面的收缩变形,从而使玻璃表层致密度降低,而化学钢化过程中采用离子交互方式,让较大的离子取代玻璃表层上较小的离子,使其表层致密度增加.
The dynamic elastic modulus, shear modulus and Poison ratio of soda-lime glass before and after the tempering process were investigated in this paper. The elasticity of glass was tested by the impulse excitation method. The effect of two different tempering processes on the elasticity of glass was analyzed and the mechanism of tempering was discussed. The test result show that the elastic modulus before and after tempering are different. The elastic modulus of thermal tempering glass is 4% lower, and that of chemical tempering glass is 6% higher than the modulus of initial glass. The mechanism of physical tempering process is that the density of surface layer decreases because shrinking is harder in the core than on the surface. The mechanism of chemical tempering process is that the density of surface layer increases because the ion of small radius is substituted by those of large radius. Thus the change of elastic modulus after tempering can be explained through these mechanisms.
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