Clamped sandwich beams with thick weak cores from central impact: A theoretical study

Liu, Hua; Liu, Hu; Yang, Jinling

doi:10.1016/j.compstruct.2017.02.028

Cited by 9 publications

(2 citation statements)

References 17 publications

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“…Moreover, most models are limited in depicting the cellular-core dynamic compaction in the thickness direction, as the tensile strength in the transverse direction is ignored. The transverse tensile strength of the core is crucial to the shock resistance of sandwich beams (Liu et al ., 2017). Therefore, to understand the dynamic response of clamped sandwich beams and expand the application of theoretical models, time-based pressure loading and the transverse tensile strength of the cellular core should be considered.…”

Section: Introductionmentioning

confidence: 99%

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

Li,

Zhang

et al. 2023

MMMS

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PurposeSandwich 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/approachFirst, 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.FindingsThe 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/valueA new model was proposed and employed to optimally design clamped cellular-core sandwich-beam configurations subjected to shock loading.

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Section: Introductionmentioning

confidence: 99%

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

Li,

Zhang

et al. 2023

MMMS

View full text Add to dashboard Cite

show abstract

“…Over the last decade, many core topologies for sandwich panels have emerged, showing structural advantages over monolithic construction for quasi-static loading. These include metallic foams [1][2][3], honeycombs [4,5], corrugated cores [6,7], lattice materials with pyramidal and tetrahedral arrangements [8][9][10], egg-box structures [11], and cores with negative Poisson's ratios [12,13].…”

Section: Introductionmentioning

confidence: 99%

DMA2022 Dynamic resistance and energy absorption of sandwich beam with based on micro-topology optimization with maximum shear modulus

et al. 2022

Preprint

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Based on the mechanical characteristics of the core layer, which withstands the shear stress and deformation of a sandwich beam, a topology optimization framework based on the bi-directional evolutionary structural optimization method is proposed to optimize the core layer composed of a periodic base cell with extreme shear stiffness. The effects of the volume fraction, filter radius, and initial periodic base cell (PBC) aspect ratio on the micro-topology of the core and the dynamic response process, core compression, and energy absorption capacity of the sandwich beams under blast impact loading were analyzed by the finite element method. The results demonstrated that the over-pressure action stage was coupled with the core compression stage. Under the same loading and mass per unit area, the sandwich beam with a 20% volume fraction core layer had the best blast resistance. The filter radius has a slight effect on the shear stiffness and blast resistances of the sandwich beams, but increasing the filter radius could slightly improve the bending stiffness. Upon changing the initial PBC aspect ratio, there are three methods for PBC evolution: the first is to change the angle between the adjacent bars, the second is to further form holes in the bars, and the third is to combine the first two methods. However, not all three methods can improve the energy absorption capacity of the structure. Changing the aspect ratio of the PBC arbitrarily may lead to worse results. More detailed studies are necessary if further optimization is to be achieved.

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Different experimental ways to minimize the preforming defects of multi-layered interlock dry fabric

Shanwan¹,

Allaoui²

2018

Int J Mater Form

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To cite this version:A. Shanwan, Samir Allaoui. Different experimental ways to minimize the preforming defects of multi-layered interlock dry fabric. International Journal of Material Forming, Springer Verlag, 2018Verlag, , 10.1007Verlag, /s12289-018-1407 Different experimental ways to minimize the preforming defects of multilayered interlock dry fabric. Abstract:This study presents a strategy to improve the quality of a dry fabric's preforms. Preforming tests were realized with one and two-layers of interlock carbone fabric at different configurations.Initial results led to preforms with several defects. For one-layer preforming, a new blank holder geometry and an increase of the pressure applied on the fabric allowed to improve the quality of the preforms. On the other hand, for two-layer preforming, the insertion of a mat fabric in the interface of the two preformed layers allowed to decrease the friction and to improve the preforms quality, significantly.

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Clamped sandwich beams with thick weak cores from central impact: A theoretical study

Cited by 9 publications

References 17 publications

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

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

DMA2022 Dynamic resistance and energy absorption of sandwich beam with based on micro-topology optimization with maximum shear modulus

Different experimental ways to minimize the preforming defects of multi-layered interlock dry fabric

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