The crush behaviour of Rohacell-51WF structural foam

Li, Qingming; Mines, R. A. W.; Birch, R. S.

doi:10.1016/s0020-7683(99)00277-2

Cited by 113 publications

(110 citation statements)

References 18 publications

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“…For the 2.5mm cell size, the shear failure stress is about 6MPa which should be compared to the compression value of 10MPa. This would indicate a failure surface typical of foams [15]. However, more unusual cellular structures may well give more unconventional failure surfaces.…”

Section: H Figurementioning

confidence: 99%

“…The latter failure mode gives a more abrupt reduction in stress after failure. It would be interesting to conduct both biaxial and hydrostatic tests, as these are important for localised loadings in sandwich structures [4,15]. For the 2.5mm cell size, the shear failure stress is about 6MPa which should be compared to the compression value of 10MPa.…”

Section: H Figurementioning

confidence: 99%

See 1 more Smart Citation

Crush behaviour of open cellular lattice structures manufactured using selective laser melting

Santorinaios¹,

Brooks²,

Sutcliffe³

et al. 2006

WIT Transactions on the Built Environment, Vol 85

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Open cellular lattice structures, made out of stainless steel, have been manufactured using the micro fabrication procedure of selective laser melting. A single geometry has been considered, namely vertical struts with cross bracing with a cell geometry of a cubic form. Blocks of this material, with dimensions of 25 mm cube, have been tested under compression and shear loading. Three cell sizes have been considered, namely 1.25, 2.5 and 5 mm. Uniaxial compression and shear force versus displacement and failure characteristics of these materials are discussed, In this way, the micro mechanical characteristics of the material and manufacturing parameters are related to bulk properties.

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Section: H Figurementioning

confidence: 99%

Section: H Figurementioning

confidence: 99%

Crush behaviour of open cellular lattice structures manufactured using selective laser melting

Santorinaios¹,

Brooks²,

Sutcliffe³

et al. 2006

WIT Transactions on the Built Environment, Vol 85

View full text Add to dashboard Cite

show abstract

“…The uniaxial tension and compression test data that derived from the theoretical analysis are used as the input of model, as shown in Figure 12. Noticing that the stress-strain curve of PMI foam under uniaxial tension is treated as linear [3,23]. The maximum principal stress criteria is used to model the failure in the PMI foam core and the elements that exceed the maximum allowable principal tensile stress, which is 3.7 MPa according to the tests [26], will be removed during the simulation process.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Considerable studies have been carried out on the failure analysis of PMI foams. Li and Mines have studied the compressive process of PMI foam under uniaxial compression [2] and the crush behavior under a series of tests [3]. Chen et al have investigated the influence of foam structure on the macroscopic properties of PMI foam [4].…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism of PMI foam core sandwich beam in bending

Wang

Shi

Zhou

et al. 2015

Int. J. Simul. Multisci. Des. Optim.

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-Polymethacrylimide (PMI) foams have been widely applied in aerospace engineering as the core material of sandwich structures. This paper proposes a modified model to predict the constitutive relation of PMI foams and compares it to existing testing data. The study is then applied to the investigation of the failure mechanism of PMI foam core sandwich beams in bending. Corresponding bending tests were carried out where a complex failure process was observed through a high-speed camera. Numerical model of the foregoing sandwich beam is developed, in which the maximum principal stress criteria is used to predict damage propagation in PMI foam core. Both results from tests and numerical simulation validate the reliability of the theoretical prediction of the failure of PMI foam core sandwich beam using the proposed modified model of PMI foams. This study provides a theoretic tool for the design of sandwich structures with PMI foam core.

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“…A variety of cellular structures have been investigated with the aim of improving understanding of compressive response and thus maximising energy absorption over a range of representative impact conditions. These include metal [3][4][5] and polymeric [6][7][8][9] foams, composites [10][11][12] and honeycombs [13][14][15]. One notable feature of this class of materials is the enhance-ment of crushing strength observed under dynamic loading due to inertial effects, as seen by Reid and Peng [16] in wood, Tan et al [17] in aluminium foams and Xue and Hutchinson [18] and Wu and Jiang [19] in metallic honeycombs.…”

Section: Introductionmentioning

confidence: 99%

High resolution simulations of energy absorption in dynamically loaded cellular structures

et al. 2016

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Cellular materials have potential application as absorbers of energy generated by high velocity impact. CTH, a Sandia National Laboratories Code which allows very severe strains to be simulated, has been used to perform very high resolution simulations showing the dynamic crushing of a series of two-dimensional, stainless steel metal structures with varying architectures. The structures are positioned to provide a cushion between a solid stainless steel flyer plate with velocities ranging from 300 to 900 m/s, and an initially stationary stainless steel target. Each of the alternative architectures under consideration was formed by an array of identical cells each of which had a constant volume and a constant density. The resolution of the simulations was maximised by choosing a configuration in which onedimensional conditions persisted for the full period over which the specimen densified, a condition which is most readily met by impacting high density specimens at high velocity. It was found that the total plastic flow and, therefore, the irreversible energy dissipated in the fully densified energy absorbing cell, increase (a) as the structure becomes more rodlike and less platelike and (b) as the impact velocity increases. Sequential CTH images of the deformation processes show that the flow of the cell material may be broadly divided into macroscopic flow perpendicular to the compression direction and jetting-type processes (microki- Department of Engineering, University of Cambridge, Cambridge, UK netic flow) which tend to predominate in rod and rodlike configurations and also tend to play an increasing role at increased strain rates. A very simple analysis of a configuration in which a solid flyer impacts a solid target provides a baseline against which to compare and explain features seen in the simulations. The work provides a basis for the development of energy absorbing structures for application in the 200-1000 m/s impact regime.

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The crush behaviour of Rohacell-51WF structural foam

Cited by 113 publications

References 18 publications

Crush behaviour of open cellular lattice structures manufactured using selective laser melting

Crush behaviour of open cellular lattice structures manufactured using selective laser melting

Failure mechanism of PMI foam core sandwich beam in bending

High resolution simulations of energy absorption in dynamically loaded cellular structures

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