Analytical modeling and optimal design of clamped sandwich beams with cellular cores subjected to shock loading

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Multidiscipline Modeling in Materials and Structures Pub Date : 2023-09-26 DOI:10.1108/mmms-12-2022-0278
Lang Li, Jiahui Li, Fan Zhang, Fusen Jia, Lei Li
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Abstract

Purpose Sandwich structures with well-designed cellular cores exhibit superior shock resistance compared to monolithic structures of equal mass. This study aims to develop a comprehensive analytical model for predicting the dynamic response of cellular-core sandwich structures subjected to shock loading and investigate their application in protective design. Design/methodology/approach First, an analytical model of a clamped sandwich beam for over-span shock loading was developed. In this model, the incident shock-wave reflection was considered, the clamped face sheets were simplified using two single-degree-of-freedom (SDOF) systems, the core was idealized using the rigid-perfectly-plastic-locking (RPPL) model in the thickness direction and simplified as an SDOF system in the span direction. The model was then evaluated using existing analytical models before being employed to design the sandwich-beam configurations for two typical engineering applications. Findings The model effectively predicted the dynamic response of sandwich panels, especially when the shock-loading pulse shape was considered. The optimal compressive cellular-core strength increased with increasing peak pressure and shock-loading impulse. Neglecting the core tensile strength could result in an overestimation of the optimal compressive cellular-core strength. Originality/value A new model was proposed and employed to optimally design clamped cellular-core sandwich-beam configurations subjected to shock loading.
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冲击荷载作用下蜂窝芯夹紧夹层梁的解析建模与优化设计
目的:与同等质量的单片结构相比,具有精心设计的蜂窝芯的夹层结构具有更好的抗冲击性能。本研究旨在建立一个综合的分析模型来预测细胞核夹层结构在冲击载荷下的动力响应,并研究其在防护设计中的应用。设计/方法/方法首先,建立了夹紧夹层梁跨跨冲击载荷的分析模型。该模型考虑了入射冲击波的反射,将夹紧面片简化为两个单自由度系统,在厚度方向上采用刚性-完全塑性锁定(RPPL)模型理想化芯,在跨度方向上简化为一个单自由度系统。然后使用现有的分析模型对模型进行评估,然后将其用于设计两个典型工程应用的夹层梁结构。发现该模型能有效预测夹层板的动力响应,特别是考虑冲击脉冲形状时。随着峰值压力和冲击载荷脉冲的增大,最优压缩芯强度增大。忽略岩心抗拉强度会导致高估最优的细胞-岩心抗压强度。提出了一种新的模型,并将其应用于冲击载荷下夹持蜂窝芯夹芯梁结构的优化设计。
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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