Static Behaviour of Pre-stressed Polymer Composite Sandwich Beams

Mines, R. A. W.; Li, Q. M.; Birch, R. S.; Rigby, R.H.; Al-Khalil, M.; Tanner, Andrew

doi:10.1007/0-306-48410-2_62

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…Garcia-Castillo et al [18] performed a comparable investigation for high velocity impact loads. Sharma [19], Mines et al [20] and Malekzadeh et al [3] also included composite sandwich structures with foam or honeycomb cores in their studies.…”

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

“…FE simulations of low velocity impacts on preloaded composite structures have first been addressed by Sun and Chen [27]. However, just like in the work of Tweed et al [24] and Mines et al [20], who used the commercial explicit code LS-DYNA, no detailed information on the preload modelling are given. Kelkar et al [28] bring forward the argument that their static and dynamic tests led to the same results.…”

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

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Low velocity impact on CFRP plates with compressive preload: Test and modelling

Heimbs¹,

Heller²,

Middendorf³

et al. 2009

International Journal of Impact Engineering

190

111

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When laminated composite materials in modern aircraft structures are subject to impact loads, they are typically not unloaded but under a certain state of prestress. Therefore, in this study the effect of a compressive preload on the low velocity impact behaviour of three different carbon fibre-reinforced plastic (CFRP) materials is investigated. An experimental test programme is documented first, including the design of a preload test device, the specimen manufacture and the results description. An increased deflection and energy absorption for composite plates with a preload of 80% of the buckling load could be observed. Non-destructive inspections showed a large extent of delaminations occurring between individual plies, being an important energy absorption mechanism. The development of numerical simulation methods for this impact scenario using the commercial explicit finite element code LS-DYNA is described in detail. The focus is on the composite material, delamination and preload modelling. The final simulation results showed a good correlation to the experimental data in terms of force and energy plots or the evaluated interlaminar and intralaminar damage, although these numerical results proved to be strongly influenced by simulation parameters like mesh size or the number of shell element layers.

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Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

Section: A C C E P T E D Article In Pressmentioning

confidence: 99%

Low velocity impact on CFRP plates with compressive preload: Test and modelling

Heimbs¹,

Heller²,

Middendorf³

et al. 2009

International Journal of Impact Engineering

190

111

View full text Add to dashboard Cite

show abstract

“…For this reason, the dependencies of the mechanical characteristics on the sample thickness and density, as well as on the processing method, are discussed. Avalle [4] refers to many experimental studies carried out to determine the compressive properties of steam-based EPP particle foam parts for automotive use [5][6][7][8][9][10][11][12][13][14][15]. It was pointed out that the results are rather inconsistent and not general enough.…”

Section: Theoriesmentioning

confidence: 99%

Comparison of Mechanical Properties of Steam-Free and Steam-Based Specimens Made of Expanded Polypropylene Beads

Handtke,

Hain,

Fischer

et al. 2024

Polymers

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Reducing the CO2 emissions of plastic parts is crucial in terms of sustainable product and process designs. Approaches include the use of recycled materials and reducing the energy demands of processes through more efficient technologies. In this context, this study shows the potential of the steam-free processing of particle foam beads into thin-walled moulded parts. Expanded polypropylene (EPP) particle foam beads have been processed in both a steam-free and steam-based process. For this purpose, specimens with different part densities and thicknesses were produced, the mechanical properties were investigated, and the surface quality was discussed. Specimens made of EPP with a part thickness of 5 to 20 mm and part densities of 60 to 185 g/L were produced steam-free. Lower part thicknesses and higher densities increase the mechanical properties. As the density increased, the homogeneity of the surfaces of the steam-free specimens also increased. In comparison, specimens with a thickness of 10 mm and part densities of 35 to 90 g/L were produced on a steam-based process. The results of the mechanical test were compared with those of the steam-free specimens. The steam-based specimens showed higher mechanical properties for the same density.

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“…The volumetric strain term differentiates between tension and compression, while the principal stress addresses deviatoric effects. Mines et al [14] suggest a single parameter, i.e. maximum principal strain criterion, for polymeric foam.…”

Section: Crushable Foamsmentioning

confidence: 99%

On the Characterisation of Foam and Micro‐lattice Materials used in Sandwich Construction¹

Mines

2008

Strain

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The paper gives an overview of issues relating to the characterisation of the progressive collapse of core cellular materials used in sandwich construction. The specific structural application addressed is foreign object impact, and in this case the core cellular material is subject to multi‐axial stresses, progressive collapse and possible rupture. The paper gives an overview of various theoretical and modelling issues, which are then related to experimental materials and structural tests for model development, calibration and validation. Most discussion concerns polymeric crushable foam, metal foam and metallic lattice structures.

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Static Behaviour of Pre-stressed Polymer Composite Sandwich Beams

Cited by 4 publications

References 3 publications

Low velocity impact on CFRP plates with compressive preload: Test and modelling

Low velocity impact on CFRP plates with compressive preload: Test and modelling

Comparison of Mechanical Properties of Steam-Free and Steam-Based Specimens Made of Expanded Polypropylene Beads

On the Characterisation of Foam and Micro‐lattice Materials used in Sandwich Construction¹

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Static Behaviour of Pre-stressed Polymer Composite Sandwich Beams

Cited by 4 publications

References 3 publications

Low velocity impact on CFRP plates with compressive preload: Test and modelling

Low velocity impact on CFRP plates with compressive preload: Test and modelling

Comparison of Mechanical Properties of Steam-Free and Steam-Based Specimens Made of Expanded Polypropylene Beads

On the Characterisation of Foam and Micro‐lattice Materials used in Sandwich Construction1

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On the Characterisation of Foam and Micro‐lattice Materials used in Sandwich Construction¹