Compliant hexagonal periodic lattice structures having both high shear strength and high shear strain

Ju, Jaehyung; Summers, Joshua D.

doi:10.1016/j.matdes.2010.08.029

Cited by 150 publications

(55 citation statements)

References 36 publications

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“…As an example, honeycomb with triangular unit cell is even stiffer compared to hexagonal honeycomb under the same axial stress. Through the comparison of triangular honeycombs, square honeycombs and hexagonal honeycombs under the same force by Ju and Summers [19], triangular honeycombs show the minimal value of normalized shear strain-shear strength, indicating the advantage of triangular honeycombs under shear force. Brenne et al [20] gained insight into the impact of microstructure with square unit cells and local strains on the monotonic and cyclic behaviour under uniaxial and a more complex loading conditions by a plain sandwich structure under four-point-bending.…”

Section: Introductionmentioning

confidence: 99%

“…Honeycombs are the typical structures defined by two-dimensional prismatic cellular materials of periodic meso-structures and have been primarily used in lightweight sandwich structures for their high out-of-line stiffness [17,18]. Based on the belief that hexagonal honeycombs are valued for their combination of high strength and low density, Ju et al [19] employed an in-plane linear elastic honeycomb model to compliant hexagonal periodic lattice structures, which turn out to achieve both high shear strength and high shear strain. As stated by Gibson and Ashby [17], cells in honeycombs are not always hexagonal.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Niu

Choo

Sun

et al. 2017

Int J Mech Mater Des

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The design and analysis of lattice structures manufactured using Additive Manufacturing (AM) technique is a new approach to create lightweight high-strength components. However, it is difficult for engineers to choose the proper unit cell for a certain function structure and loading case. In this paper, three beam-like lattice structures with triangular prism, square prism and hexagonal prism were designed, manufactured by SLM process using AlSi10Mg and tested. The mechanical performances of lattice structures with equal relative density, equal base area and height, and equal length for all unit cells were conducted by Finite Element Analysis (FEA). It was found that effective Young's modulus is proportional to relative density, but with different affecting levels. When the lattice structures are designed with the same relative density or the same side lengths, the effective Young's modulus of lattice structure with triangular prism exhibits the maximum value for both cases. When the lattice structures are designed with the same base areas for all unit cells, the effective Young's modulus of lattice structures with square prism presents the maximum. FEA results also show that the maximum stress of lattice structures with triangular prisms in each comparison is at the lowest level and the stiffness-to-mass ratio remains at the maximum value, showing the overwhelming advantages in terms of mechanical strength. The excellent agreements between numerical results and experimental tests reveal the validity of FEA methods applied. The results in this work provide an explicit guideline to fabricate beam-like lattice structures with the best tensile and bending capabilities.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Niu

Choo

Sun

et al. 2017

Int J Mech Mater Des

View full text Add to dashboard Cite

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“…Grima et al [12] discussed a new explanation for 2 Advances in Mechanical Engineering achieving the auxetic behavior in cellular solids according to the "rotation of rigid units" mechanism. Ju and Summers [13] analyzed the effects of cell geometries on the elastic limits of auxetic honeycombs under simple shear loading. Based on Eshelby's inclusion concept, Azoti et al [14] explored the design space of auxetic materials through a micromechanical multiscale analysis.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Dynamic Crushing Behavior of Auxetic Honeycombs with Various Cell-Wall Angles

Zhang

Ding

et al. 2014

Advances in Mechanical Engineering

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Auxetic honeycombs have proven to be an attractive advantage in actual engineering applications owing to their unique mechanical characteristic and better energy absorption ability. The in-plane dynamic crushing behaviors of the honeycombs with various cellwall angles are studied by means of explicit dynamic finite element simulation. The influences of the cell-wall angle, the impact velocity, and the edge thickness on the macro/microdeformation behaviors, the plateau stresses, and the specific energy absorption of auxetic honeycombs are discussed in detail. Numerical results show, that except for the impact velocity and the edge thickness, the in-plane dynamic performances of auxetic honeycombs also rely on the cell-wall angle. The "> <"-mode local deformation bands form under low-or moderate-velocity impacting, which results in lateral compression shrinkage and shows negative Poisson's ratio during the crushing. For the given impact velocity, the plateau stress at the proximal end and the energy-absorbed ability can be improved by increasing the negative cell angle, the relative density, the impact velocity, and the matrix material strength. When the microcell parameters are the constant, the plateau stresses are proportional to the square of impact velocity.

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“…Alti-Veltin and Gandhi [4] investigated the energy absorption capability of cellular honeycomb with various cell geometries subjected to in-plane compression through numerical analysis. Ju and Summers [5] carried out numerical studies for design of honeycombs having a high shear strength and a high shear yield strain.…”

Section: Introductionmentioning

confidence: 99%

Steel Honeycomb Dampers for Seismic Retrofit of Structures

2015

International Academy of Engineers (IA-E) April 24-25, 2015 Pattaya (Thailand)

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Abstract-The purpose of this paper is to investigate the seismic performance of a honeycomb shaped steel hysteretic damper applied to seismic retrofit or strengthening of a structure. Bilinear model of the honeycomb damper was developed based on the nonlinear force-displacement relationship obtained from finite element analysis. The honeycomb dampers were applied for seismic retrofit of a 15-story apartment building designed without considering seismic load and for seismic design of a 3-story moment frame designed with reduced seismic load. The analysis results showed that the honeycomb dampers were effective in the enhancement of seismic-load resisting capacity of the model structures.

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Compliant hexagonal periodic lattice structures having both high shear strength and high shear strain

Cited by 150 publications

References 36 publications

Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Numerical study on load-bearing capabilities of beam-like lattice structures with three different unit cells

Numerical Investigation on Dynamic Crushing Behavior of Auxetic Honeycombs with Various Cell-Wall Angles

Steel Honeycomb Dampers for Seismic Retrofit of Structures

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