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首页> 外文期刊>Glass Structures & Engineering >The effects of high strain-rate and in-plane restraint on quasi-statically loaded laminated glass: a theoretical study with applications to blast enhancement
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The effects of high strain-rate and in-plane restraint on quasi-statically loaded laminated glass: a theoretical study with applications to blast enhancement

机译：高应变率和面内约束对准静态加载夹层玻璃的影响：理论研究及其在爆炸增强中的应用

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Laminated glass panels are increasingly used to improve the blast resilience of glazed facades, as part of efforts to mitigate the threat posed to buildings and their occupants by terrorist attacks. The blast response of these ductile panels is still only partially understood, with an evident knowledge gap between fundamental behaviour at the material level and observations from full-scale blast tests. To enhance our understanding, and help bridge this gap, this paper adopts a 'first principles' approach to investigate the effects of high strain-rate, associated with blast loading, and the in-plane restraint offered by blast-resistant frames. These are studied by developing simplified analytical beam models, for all stages of deformation, that account for the enhanced properties of both the glass and the interlayer at high strain-rates. The increased shear modulus of the interlayer results in a composite bending response of the un-fractured laminated glass. This also enhances the residual post-fracture bending moment capacity, arising from the combined action of the glass fragments in compression and the interlayer in tension, which is considered negligible under low strain-rates. The post-fracture resistance is significantly improved by the introduction of in-plane restraint, due to the membrane action associated with panel stretching under large deflections. This is demonstrated by developing a yield condition that accounts for the relative contributions of bending and membrane action, and applying the upper bound theorem of plasticity, assuming a tearing failure of the interlayer. Future work aims to complete the theoretical framework by including the assessment of plate-action and inertia effects.
机译：夹层玻璃板越来越多地用于提高玻璃幕墙的爆炸复原力，这是减轻恐怖袭击对建筑物及其居住者构成威胁的努力的一部分。这些延性板的爆炸响应仍仅部分被理解，在材料层面的基本行为与全面爆炸试验的观察结果之间存在明显的知识鸿沟。为了增强我们的理解并帮助弥合这种差距，本文采用“第一原理”方法来研究高应变率与爆炸载荷相关的影响，以及抗爆炸框架提供的平面约束。通过为变形的所有阶段开发简化的分析光束模型来研究这些问题，这些模型解释了在高应变速率下玻璃和中间层的增强特性。夹层的剪切模量增加导致未破裂的夹层玻璃的复合弯曲响应。这也增加了残余的断裂后弯矩的能力，这是由于玻璃碎片在压缩和夹层在张力下的共同作用而产生的，在低应变率下这可以忽略不计。由于与大挠度下面板拉伸相关的膜作用，通过引入平面内约束，可显着提高抗断裂后性能。通过建立屈服条件来说明这一点，该屈服条件考虑了弯曲和膜作用的相对贡献，并假设中间层的撕裂破坏，应用了塑性的上限定理。未来的工作旨在通过评估板作用和惯性效应来完善理论框架。

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