钢化玻璃在受到冰的随机冲击时快速断裂

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Yiwen Cui , Nelson Lam , Shuangmin Shi , Guoxing Lu , Emad Gad , Lihai Zhang
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引用次数: 0

摘要

在预先存在的缺陷处建立断裂触发模型是预测玻璃最终失效的一种不断发展的方法。事实证明,在处理高度瞬态的冰雹冲击时,这种断裂力学建模方法比校准概率分布模型(通常采用的方法)能给出更可靠的预测结果。控制快速裂纹增长的动态应力强度因子对临界缺陷周围的复杂应力状态非常敏感。对三维局部应力进行有限元模拟可能会产生很高的计算成本,再加上需要重复计算直到收敛,以及模拟暴风雨场景中的多次撞击,计算成本就更高了。本研究开发了闭式表达式,无需进行任何模拟。在冰雹冲击下,由于高度瞬态应力由波浪控制,因此在建模时无需考虑玻璃板的边界条件。输入参数包括玻璃的厚度和预应力水平;撞击位置与已知裂缝的偏移量及其深度;冰冲击器的大小、速度和温度。40 个测试方案的结果涉及 5 个偏移距离、3 个裂缝深度、2 种玻璃厚度和 2 种冰的大小,用于验证预测结果,并揭示冲击结果对相对于已知裂缝的冲击位置变化的敏感性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Fast fracture in toughened glass when impacted randomly by Ice

Fast fracture in toughened glass when impacted randomly by Ice

Modelling the triggering of fracture at a pre-existing flaw is an evolving method of predicting ultimate failure in glass. This fracture mechanics approach of modelling has been shown to give more reliable predictions than a calibrated probabilistic distribution model (as is commonly adopted) when dealing with hail impact which is highly transient in nature. The dynamic stress intensity factor controlling fast crack growth is sensitive to the complex stress state surrounding the critical flaw. Finite element simulations of localised stresses in 3D could incur high computation cost which is compounded by the need to repeat computations until convergence and to simulate multiple strikes in emulating a storm scenario. In this study, closed-form expressions were developed to waive away the need of any simulations. With hail impact, boundary conditions of the glass panel need not be factored into the modelling, as the highly transient stresses are wave controlled. Input parameters are the thickness and level of prestress in glass; offset of position of strike from the known crack and its depth; and the size, velocity, and temperature of the ice impactor. Results from 40 test scenarios involving 5 offset distances, 3 crack depths, 2 glass thicknesses, and 2 sizes of ice were used to validate the prediction, and to reveal the sensitivity of the outcome of the impact to changes in the impact position relative to the known crack.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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