Strain-rate dependent dynamic constitutive model of tempered glass

Lei Li, Bangxian Liu, Erfeng An
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引用次数: 0

Abstract

Tempered glass is essentially different from float glass in dynamic mechanical properties, although it is toughened float glass made by physics and they have the same chemical composition. The dynamic mechanical properties of tempered glass are investigated in this paper by using the modified techniques of the Split Hopkinson Pressure Bar (SHPB), and the curves of stress-strain are obtained in various strain rates. Experimental results show that tempered glass is sensitive to strain rates and its dynamic curves of stress-strain are nonlinear. Further study reveals the phenomenon of “pseudo-plastic yield” is completely different from that of ductile materials, and dynamic Young’s modulus and dynamic compressive strength of tempered glass increase with the increasing strain rates. Based on the damage mechanics theory, a kind of constitutive model with damage of tempered glass is given. A strain rate-dependent constitutive model with damage of tempered glass is created by the use of polynomial fitting, according to SHPB experimental results.
钢化玻璃的应变速率相关动态结构模型
钢化玻璃与浮法玻璃虽然都是由物理学原理制成的钢化浮法玻璃,且化学成分相同,但在动态力学性能方面却有本质区别。本文采用改进的分体式霍普金森压力棒(SHPB)技术研究了钢化玻璃的动态力学性能,并得到了不同应变速率下的应力-应变曲线。实验结果表明,钢化玻璃对应变速率很敏感,其应力-应变动态曲线是非线性的。进一步研究发现,"伪塑性屈服 "现象与韧性材料完全不同,钢化玻璃的动态杨氏模量和动态抗压强度随应变速率的增加而增加。基于损伤力学理论,给出了一种钢化玻璃的损伤构成模型。根据 SHPB 实验结果,利用多项式拟合建立了与应变速率相关的钢化玻璃损伤构成模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
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