Elastic buckling of hexagonal honeycombs with dual imperfections

Yang, Mei Yi; Huang, Jong Shin; Jia, Hu

doi:10.1016/j.compstruct.2007.01.016

Cited by 26 publications

(5 citation statements)

References 17 publications

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“…The way that cell anomalies are manifesting themselves in the honeycomb structure and respective deviated analysis results, is discused by Hohe en Becker [17]. The influence of irregular cell thickness and geometry on the mechanical properties is analyzed by Li et al [18], Yang et al [19] (cell thickness variation), Simone and Gibson [20,21] (thickness variations of cell boundaries, cell curvature and cross section) and finally Guo and Gibson [4] (elimination of cells). In all these papers, a finite element model of the honeycomb core layer was used.…”

Section: Mechanical Properties Of Honeycomb Sandwich Panelsmentioning

confidence: 98%

Development of an Equivalent Composite Honeycomb Model: A Finite Element Study

et al. 2016

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Finite element analysis of complex geometries such as honeycomb composites, brings forth several difficulties. These problems are expressed primarily as high calculation times but also memory issues when solving these models. In order to bypass these issues, the main goal of this research paper is to define an appropriate equivalent model in order to minimize the complexity of the finite element model and thus minimize computation times. A finite element study is conducted on the design and analysis of equivalent layered models, substituting the honeycomb core in sandwich structures. A comparison is made between available equivalent models. An equivalent model with the right set of material property values is defined and benchmarked, consisting of one continuous layer with orthotropic elastic properties based on different available approximate formulas. This way the complex geometry does not need to be created while the model yields sufficiently accurate results.

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Section: Mechanical Properties Of Honeycomb Sandwich Panelsmentioning

confidence: 98%

Development of an Equivalent Composite Honeycomb Model: A Finite Element Study

et al. 2016

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“…Asprone et al [6] performed a statistical finite element study on the buckling of phenolic resin-impregnated aramid paper and compared the finite element modeling results to experimental results. Other studies [7][8][9][10][11][12][13] were performed to study the in-plane (sandwich panel in-plane) compressive behavior of cellular cores.…”

Section: Introductionmentioning

confidence: 99%

Degradation in Cellular Core Mechanical Properties due to Transverse Compression

Soliman

Kapania

2014

55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Manufacturing defects, which occur often in cellular cores of sandwich structures, lead to buckled cells in the core and thus to degraded constitutive core properties. Defects in the core cells may occur due to unintentional tool impacts onto the panel during manufacturing, handling processes, or defects in the manufactured core itself. The degraded constitutive properties of the core lead to local stiffness degradations of the sandwich panel, which in turn may impact the capability of nearby inserts; inserts are often used for component mounting to the panel or as joints used for joining the sandwich panel with another panel. The aim of this paper is to: a) Understand the effect of core density on the critical buckling load/buckling capability of the unit cell for each of the three core shapes: hexagonal, square and triangular, b) Understand the effect of core height (core thickness within the sandwich panel) on the critical buckling load/buckling capability of the unit cell for each of the three core shapes, and c) Investigate the degradation in the constitutive properties of the cellular core due to permanent deformation resulting from transverse compression. Detailed finite element models for five cell sizes and twenty one core densities were created for each of the following cellular core shapes: hexagonal, square and triangular. The critical buckling load is calculated for all twenty one core densities and the five cell sizes under consideration for the hexagonal, square and triangular cellular cores. Additionally, the critical buckling load is calculated for four core heights from 0.25" to 1.00" core height with 0.25" increments to study the effect of the core height on the critical buckling load of the unit cell. The degradation of constitutive properties of the hexagonal, square and triangular cellular cores due to buckling under transverse compression loading for the 1/8″ cell size and core density of 3.1 pcf is studied for the 0.5″ core height cells. All cellular cores are assumed to be manufactured of corrugated Al-5056.

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“…Mora and Waas, [3], studied the micropolar elastic representation of a honeycomb structure with a rigid circular inclusion. Several other studies have been conducted on hexagonal honeycombs with a view to understanding macroscopic representations for the purpose of mechanical modeling [4,5]. Ostoja-Starzewski and Jasiuk [6] introduced the stress-strain relation related to planar problems of Cosserat elasticity to examine planar Cosserat elasticity with respect to certain features that are absent in 2D classical elasticity.…”

Section: Introductionmentioning

confidence: 99%

The Cosserat Elasticity Constants of Circular Cell Honeycombs

Chung

Waas

2010

AMR

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Closed form expressions for the Cosserat constants for circular cell honeycombs are derived using a combination of non-dimensional analysis and numerical analysis. The expressions for the four in-plane Cosserat compliances, which are the plane strain bulk compliance, the shear compliance, the micropolar compliance and the bending compliance are derived in terms of the cell size, cell thickness and the linear elastic properties of the cell wall material. Numerical analyses are performed to verify the accuracy of the derived constants by considering different combinations of geometric parameters and different numbers of cells for the honeycombs. It is shown that the closed form expressions are an accurate representation of the Cosserat constants of circular cell honeycombs.

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Elastic buckling of hexagonal honeycombs with dual imperfections

Cited by 26 publications

References 17 publications

Development of an Equivalent Composite Honeycomb Model: A Finite Element Study

Development of an Equivalent Composite Honeycomb Model: A Finite Element Study

Degradation in Cellular Core Mechanical Properties due to Transverse Compression

The Cosserat Elasticity Constants of Circular Cell Honeycombs

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