Effects of honeycomb core damage on the performance of composite sandwich structures

King, William T; Guin, William E.; Jordon, J.B.; Barkey, Mark E.; Allison, P. G.

doi:10.1177/0021998319890656

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…2–4 The materials for making sandwiches mainly include metals, 5 polymers, 6 and composite materials. 7 Typical sandwich structures include honeycomb, 8,9 foam 10 and corrugated structures. 11 The mechanical properties of sandwiches highly depend on the structural design.…”

Section: Introductionmentioning

confidence: 99%

The compressive performances of 3D-printed micron-size corrugated sandwich structures

Gong

et al. 2023

Jnl of Sandwich Structures & Materials

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Micron-scale grid-shaped, V-shaped and U-shaped corrugated sandwich structures are fabricated by 3D printing technology and present different mechanical properties from those made by traditional method. Their peak stresses and elastic moduli could be fitted to cubic functions. The compression performance of the multilayer grid-shaped sandwich can be determined by the relative mechanical strength of layers. Adding a layer on a grid-shaped sandwich has no significant influence on the peak stress, but can enhance the elastic modulus by about 60.9 MPa. The deformation modes of multilayer V-shaped and U-shaped sandwiches can be determined by the load carrying path and the relative mechanical properties between interlayers and cores. The elastic modulus of V-shaped sandwich is enhanced with the increase of layer number, while the elastic modulus of U-shaped sandwich decreases with the increase of layer number. The peak stress and the elastic modulus of a four-layer V-shaped sandwich can reach 9.85 MPa and 261.09 MPa, and those of a four-layer U-shaped sandwich can reach 4.79 MPa and 119.18 MPa. The result reveals the principles that the reduced structural size and suppressed debonding, the structures and the load carrying path, and materials, influence the failure mode and mechanical properties of the corrugated sandwiches.

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Section: Introductionmentioning

confidence: 99%

The compressive performances of 3D-printed micron-size corrugated sandwich structures

Gong

et al. 2023

Jnl of Sandwich Structures & Materials

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“…[1][2][3] However, the traditional sandwich material is often manufactured by bonding the surface layer and the core layer together with glue or epoxy resin. [4,5] When such material is subjected to bending, impact, and shear loads, the surface layer and the core layer are prone to delamination, which will seriously affect its performance. [6][7][8] In recent years, three-dimensional (3D) woven composites with structural integrity based on three-dimensional textile technology have become a hot spot.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the behavior of epoxy foam‐filled 3D woven spacer composites under bending load

et al. 2022

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In this work, three‐dimensional woven spacer glass fiber/epoxy composites (3DWSC) and epoxy foam‐filled three‐dimensional woven spacer composites (FF‐3DWSC) were prepared, and the behavior of the two composites under bending load was investigated experimentally and numerically. The results show that compared with 3DWSC, FF‐3DWSC displayed a higher bending strength of 134.30 MPa and superior bending stiffness of 9.48 × 106 N·mm2, which was attributed to the synergistic effect of the foam and the skeleton. And unlike the serious damage caused by the significant stress concentration in 3DWSC under bending load, less damage appeared in FF‐3DWSC because the stress was dispersed by the efficient transmission of the load between foam and column yarns. Besides, there was no delamination between the foam and the skeleton after the bending test, indicating the excellent integrated structure of FF‐3DWSC. In addition, the bending behavior of 3DWSC and FF‐3DWSC was simulated on the macro‐scale model by HyperMesh and HyperView. As a result, the finite element analysis results were in close agreement with the experimental results, demonstrating the finite element simulation method proposed here is capable of being used in replacing time‐consuming experiments to study the bending properties of such 3D composites.

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“…Mocian et al 17 carried out the low velocity impact on the foam core sandwich panels with aluminium and glass fibre composite face sheets to study the effect of face sheet and foam core. King et al 18 conducted the quasi-static flexural and compression tests to study the influence of pre-existing core damage on shear and Young's modulus of HSSs with CFRP face sheets. Ge et al 19 investigated the damage morphology of thick composite laminates made of woven carbon fibre using a digital microscope and ultrasonic C-scan.…”

Section: Introductionmentioning

confidence: 99%

Structural response of sandwich structures with CFRP face sheets under quasi-static indentation and high velocity impact: An experimental and numerical study

Muniraj

Sreehari

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Honeycomb sandwich structures (HSSs) with carbon fibre reinforced polymer (CFRP) composite face sheets are extensively used as light-weight structures in aerospace engineering due to their high strength-to-weight ratio and energy absorption properties. However, the composite face sheets are highly vulnerable to impact loads and cause damage to the structure based on the impact energy. This study investigates the structural response of HSS with CFRP face sheets under quasi-static indentation and a wide range of impact energy: low to high velocity impact. A finite-element model was developed and numerical simulations were carried out at various impact energies, thereby providing deeper insights into the impact dynamics and understanding various damage states such as dent, front face sheet perforation, core damage and rear face sheet penetration. The numerical simulation result was compared with the experimentally tested HSS using a single-stage gas gun under 53.6 J to validate the finite-element model in terms of deformation and damage status. A quasi-static indentation test was conducted and numerically predicted force data under impact test for the complete perforation case was compared to address the dependency of rate of loading. The carbon nanotube (CNT) with various weight percentages (wt%), such as 0.2, 0.4 and 0.6, was added to the matrix system through a vacuum assisted resin transfer technique and experiments were conducted at 79, 107 and 135 J. The impact resistance increases with CNT addition and hence no perforation was recorded for all the test cases of 0.6 wt% CNT addition. The influence of CNT addition on the damage area is more on the bottom face sheet and a 57% reduction in damage area was recorded for the case of 0.6 wt% CNT addition at 135 J impact energy when compared to the neat carbon/epoxy composite.

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Effects of honeycomb core damage on the performance of composite sandwich structures

Cited by 7 publications

References 21 publications

The compressive performances of 3D-printed micron-size corrugated sandwich structures

The compressive performances of 3D-printed micron-size corrugated sandwich structures

Experimental and numerical study of the behavior of epoxy foam‐filled 3D woven spacer composites under bending load

Structural response of sandwich structures with CFRP face sheets under quasi-static indentation and high velocity impact: An experimental and numerical study

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