冲击波作用下一种单层钢化玻璃毁伤效应研究

发布时间：2018-04-18 06:33

本文选题：数值模拟 + 单层钢化玻璃　；参考：《湘潭大学》2017年硕士论文

【摘要】：随着国民经济快速的发展,单层钢化玻璃依靠其优异的性能在现代化都市建筑和交通等领域得到了广泛的应用。但是,单层钢化玻璃作为一种脆性材料,在冲击波作用下易于破坏,并且破坏后会带来人员伤亡和财物损失。因此,研究冲击波作用下单层钢化玻璃毁伤效应具有广泛的应用前景,如意外爆炸、事故爆炸、恐怖袭击等爆炸事件的毁伤评估以及结构防护分析和抗爆设计等都需要此研究作为参考。目前对冲击波作用下单层钢化玻璃毁伤效应的研究已成为国内外学者关注的一个重要课题,近年来用试验方法、数值模拟方法和解析方法已经取得了一些成果,其中对夹层玻璃的研究相对较多,对单层钢化玻璃的研究还很少,还没有学者对单层钢化玻璃在冲击波作用下毁伤的P-I曲线进行过研究。本文借助数值模拟方法和试验方法,对单层钢化玻璃在冲击波载荷作用下的毁伤效应进行了数值模拟和外场实验研究。主要开展了如下工作:1)项目组进行了一系列外场实验来研究冲击波对单层钢化玻璃的毁伤效应。本次试验采用直接引爆TNT炸药产生冲击波,作用在已固定好的单层钢化玻璃板上。通过对同一规格的单层钢化玻璃板进行多次试验,将实验测得的冲击波参数和碎片进行分析讨论,得到了单层钢化玻璃在受到冲击波载荷作用下破碎的超压冲量阈值。为本文的数值模拟研究奠定了实验对比的基础。2)建立了一套完整的冲击波作用下单层钢化玻璃毁伤效应的数值模拟模型。包括对单层钢化玻璃板采用Lagrange方法描述,对场地实验测得超压载荷进行简化、对钢化玻璃板模型边界条件的设定以及单层钢化玻璃本构和破坏准则的选取。通过对计算机计算时间和计算结果精度的综合考虑,对单层钢化玻璃板单元网格尺寸的敏感性进行了验证,重点利用场地实验和数值模拟对单层钢化玻璃板破坏的应变阈值进行了研究。3)借助场地实验结果和文献中实验结果对建立的冲击波作用下单层钢化玻璃毁伤效应的数值模型的合理性进行了验证。对场地实验结果进行归纳和分析,通过已建立的数值模型计算了与场地实验每发试验相对应的超压冲量组合,把计算得到的单层钢化玻璃位移云图及破坏情况与场地实验进行比对,二者吻合较好,验证了所建立的数值模型的合理性。4)利用建立的数值模型对冲击波作用下单层钢化玻璃的毁伤效应开展了规律性研究。通过已验证的数值模型进行大量的计算,得到了一系列冲击波作用下单层钢化玻璃破坏的临界超压冲量阈值,进一步,对计算所得的数据点进行曲线拟合,得到了冲击波作用下单层钢化玻璃毁伤的P-I曲线及经验公式。最后分别研究了在超压一定时和冲量一定时,单层钢化玻璃在冲击波作用下的损伤特征和规律,并且对钢化玻璃破碎后的碎片速度进行了分析。
[Abstract]:With the rapid development of national economy, single-layer toughened glass has been widely used in modern urban buildings and transportation fields.However, as a brittle material, single layer toughened glass is easy to be destroyed under shock wave, and will cause casualties and property losses.Therefore, the study of damage effect of single layer toughened glass under shock wave has a wide application prospect, such as accidental explosion, accidental explosion,The damage assessment, structural protection analysis and anti-explosion design of terrorist attacks and other explosions need this research as a reference.At present, the research on the damage effect of single layer toughened glass under shock wave has become an important subject that scholars at home and abroad have paid close attention to. In recent years, some achievements have been obtained by using experimental method, numerical simulation method and analytical method.There are many researches on laminated glass, few on single layer toughened glass, and no research on P-I curve of single layer toughened glass damaged by shock wave.In this paper, the damage effect of single layer toughened glass under shock wave loading is studied by numerical simulation and experiment.A series of field experiments were carried out to study the damage effect of shock wave on single layer toughened glass.Shock wave was produced by direct detonation of TNT explosive, which acted on the fixed single-layer toughened glass plate.The shock wave parameters and fragments of the single layer toughened glass plate of the same size were analyzed and discussed, and the overpressure impulse threshold of the single layer tempered glass was obtained under the action of shock wave load.A complete set of numerical simulation model of damage effect of single layer tempered glass under shock wave is established.The method of Lagrange is used to describe the single layer toughened glass plate, the overpressure load measured in the site experiment is simplified, the boundary condition of the model and the constitutive structure and failure criterion of the single layer tempered glass plate are set.The sensitivity of single layer toughened glass plate cell mesh size is verified by considering the computing time and accuracy of the computer.The strain threshold of single layer toughened glass plate was studied by site experiment and numerical simulation. 3) the damage effect of single layer tempered glass under shock wave was studied by site experiment and experimental results in literature.The rationality of the numerical model is verified.The results of site experiments are summarized and analyzed, and the overpressure impulse combinations corresponding to each test are calculated through the established numerical model.The calculated displacement cloud diagram and failure of single layer toughened glass are compared with the site experiment, and the results are in good agreement with each other.The rationality of the established numerical model is verified. 4) the damage effect of single layer toughened glass under shock wave is studied regularly by using the established numerical model.The critical overpressure impulse threshold of a series of shock waves is obtained by a large number of verified numerical models. Furthermore, the calculated data points are fitted by curve.The P-I curve and empirical formula of single layer toughened glass damaged by shock wave are obtained.Finally, the damage characteristics and rules of single layer toughened glass under shock wave are studied at the same time of overpressure and constant impulse, and the debris velocity after breaking of toughened glass is analyzed.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ171.732

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