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首页> 外文期刊>International journal of impact engineering >High-speed digital imaging and computational modeling of dynamic failure in composite structures subjected to underwater impulsive loads
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High-speed digital imaging and computational modeling of dynamic failure in composite structures subjected to underwater impulsive loads

机译：水下冲击载荷作用下复合结构动力破坏的高速数字成像和计算模型

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The load-carrying capacity of composite structures under water-based impulsive loads is evaluated in relation to different core materials and load intensity. The analysis focuses on the role of core density and the effect of varying structural attributes and environmental conditions on deformation and failure mechanisms in monolithic as well as sandwich composites. The structures analyzed are simply supported planar composites with PVC foam cores and E-glass/vinylester facesheets. For the analysis carried out, the material properties of the sandwich cores are varied while the total mass is kept constant. The structures are subjected to impulsive loads of different intensities using a novel new projectile-impact-based facility called the Underwater Shock Loading Simulator (USLS). In-situ high-speed digital imaging and postmortem analysis are used to study the deformation and failure of individual components, focusing on the effects of loading intensities, failure modes and material heterogeneity. Depending on the loading rate, shear cracking and/or collapse are the primary failure modes of the polymeric foam cores. Core density and height also significantly influence the response and failure modes. On a per unit weight basis, structures with low density cores consistently outperform structures with high density cores because the former undergo smaller deflections, acquire lower velocities and transmit a smaller fraction of incident impulses. Scaling relations in the form of deflection and impulse transmitted as functions of core density and load intensity are obtained to provide guidance for structural design.
机译：根据不同的芯材和载荷强度，评估了复合结构在水基脉冲载荷下的承载能力。分析的重点是堆芯复合材料中核心密度的作用以及变化的结构属性和环境条件对变形和破坏机理的影响。分析的结构是带有PVC泡沫芯和E-玻璃/乙烯基酯面板的简单支撑的平面复合材料。为了进行分析，在总质量保持恒定的同时改变了夹芯的材料性能。使用一种称为水下冲击载荷模拟器（USLS）的新型新型基于弹丸冲击的设施，该结构承受不同强度的脉冲载荷。现场高速数字成像和事后分析用于研究单个组件的变形和破坏，重点是载荷强度，破坏模式和材料异质性的影响。取决于加载速率，剪切破裂和/或塌陷是聚合物泡沫芯的主要破坏模式。堆芯的密度和高度也会显着影响响应和破坏模式。以单位重量为基准，具有低密度磁芯的结构始终优于具有高密度磁芯的结构，因为前者会发生较小的挠曲，获得较低的速度并传递较小比例的入射脉冲。获得挠度和冲量形式的比例关系，这些比例关系是芯密度和载荷强度的函数，可为结构设计提供指导。

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