Experimental investigation of energy-absorption characteristics of components of sandwich structures

Nemat‐Nasser, Sia; Kang, Woo-Jong; McGee, J.D.; Guo, Wenda; Isaacs, Jon

doi:10.1016/j.ijimpeng.2006.05.007

Cited by 130 publications

(57 citation statements)

References 25 publications

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“…The dynamic response of sandwich structures with aluminum foam cores are analyzed in experiments performed by Nemat-Nasser et al (2007). At high impact velocities, localized deformation of the metal foam is observed.…”

Section: Impact Damage In Composite and Sandwich Structuresmentioning

confidence: 99%

Impact Mechanics and High-Energy Absorbing Materials: Review

2008

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Section: Impact Damage In Composite and Sandwich Structuresmentioning

confidence: 99%

Impact Mechanics and High-Energy Absorbing Materials: Review

2008

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“…A cylindrical sandwich shell consists of outer and inner stiff thin faces made either from homogeneous metallic materials or composite laminates, separated by a thick core of soft foam or honeycomb. In the analysis of the sandwich construction, it is routinely assumed that the face sheets carry the in-plane and bending loadings and the core transmits the transverse normal and shear loads [Plantema 1966;Vinson 1999]. These classical theories also consider the transverse displacement of the core to be the same as the displacements of the middle surface of the two face sheets.…”

Section: Introductionmentioning

confidence: 99%

“…However, recent studies show that the core could experience significant changes in thickness [Liang et al 2007;Nemat-Nasser et al 2007;. As a consequence, there is an increasing concern on the influence of core compressibility on the behavior of sandwich structures.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, there is an increasing concern on the influence of core compressibility on the behavior of sandwich structures. Efforts to address this issue are demonstrated through the formulation of various advanced high-order sandwich models in the literature [Frostig et al 1992;Pai and Palazotto 2001;Hohe and Librescu 2003;. Models considering the core compressibility may not only give a more accurate solution to simpler problems, but may also help to analytically address some otherwise difficult problems such as debond behavior [Li et al 2001], shock wave propagation and energy absorption in sandwich structures.…”

Section: Introductionmentioning

confidence: 99%

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A high-order theory for cylindrical sandwich shells with flexible cores

Li¹,

Kardomateas²

2009

J. Mech. Solids Struct.

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This paper presents a nonlinear high-order theory for cylindrical sandwich shells with flexible cores, extending a previously presented high-order theory for sandwich plates. The outer and inner faces are assumed to be relatively thin compared to the core and the effects from the core compressibility are addressed in the solution by incorporating the extended nonlinear core theory into the constitutive relations of the cylindrical shells. The governing equations and boundary conditions for the cylindrical shells are derived using a variational principle. Numerical results are presented for the cases where the two faces and the core are made of orthotropic materials. These results show that this model could capture the nonlinearity in the transverse stress distribution in the core of the cylindrical sandwich shell. Numerical results are presented on the details of the stress and displacement profiles for a cylindrical sandwich shell under localized external pressure. This study could have significance for the optimal design of advanced cylindrical sandwich shells.

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“…Among all the cross sections examined by Mamalis et al [2003], thick-walled circular tubes exhibited the most stable crash mode. The experimental investigations-for example, [Lee 1962;Batterman 1965;Horton et al 1966;Johnson et al 1977;Nemat-Nasser et al 2007]-have shown that relatively thick shells (radius to thickness ratio R/t < 50) buckle axisymmetrically, whereas this symmetry breaks for thinner shells and they instead buckle in a diamond pattern. Lee [1962], Batterman [1965], and Tennyson and Muggeridege [1969] have found that initial imperfections can significantly influence diamond-shaped circumferential mode buckling (when R/t < 100), according to an incremental theory.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational evaluation of compressive response of single and hex-arrayed aluminum tubes

Nemat‐Nasser

Amini

Choi

et al. 2007

JOMMS

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We report experiments and simulations of the dynamic and quasistatic compressive response of single and hex-arrayed thick aluminum tubes. The investigation aims to further characterize how tube-based sandwich structures absorb energy. First, we study by compression tests the quasistatic buckling of single tubes of 7075 aluminum, an alloy showing sufficient ductility and plasticity to make it potentially a good choice for energy absorbing devices. The experiments show geometry-dependent buckling modes. The corresponding finite element numerical simulations correlate well and will help estimate the maximum load level, and the buckling and postbuckling responses. Second, we study the dynamic buckling of sandwiched, hex-arrayed 3003 aluminum tubes. The simulations and experimental results correlate well and show a remarkable increase in energy absorbing capacity, which is caused by the postbuckling interaction of neighboring tubes. They also show that, as the tube spacing is decreased, the overall energy absorbed increases significantly. We also simulate how varying tube length and thickness affect the buckling of the array under dynamic loading.

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Experimental investigation of energy-absorption characteristics of components of sandwich structures

Cited by 130 publications

References 25 publications

Impact Mechanics and High-Energy Absorbing Materials: Review

Impact Mechanics and High-Energy Absorbing Materials: Review

A high-order theory for cylindrical sandwich shells with flexible cores

Experimental and computational evaluation of compressive response of single and hex-arrayed aluminum tubes

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