Failure of sandwich beams consisting of alumina face sheet and aluminum foam core in bending

Abstract The influence of face/core debonding on the structural integrity of curved sandwich beams subjected to opening bending moments has been examined experimentally. The sandwich beams consisted of glass/polyester faces over a PVC H30 foam core. Debonds of various sizes were implanted by inserting thin teflon sheets at the outer face/core interface in the curved region of the beam prior to processing. A test fixture for flexure testing of curved sandwich beams was designed and manufactured, and evaluated using homogeneous isotropic beams. The surface strains at the middle of the curve were recorded to examine the response. Buckling of the debonded face sheet occurred followed by face/core propagation of the debond. Strength reduction of the beams under opening moments due to face/core debonding was substantial.

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Three-point bending of physically asymmetric metal sandwich beams with aluminum foam core: failure behavior and optimal design

Composite Structures ◽

10.1016/j.compstruct.2021.114873 ◽

2021 ◽

pp. 114873

Author(s):

Mingshi Wang ◽

Xuehui Yu ◽

Jianxun Zhang ◽

Qinghua Qin

Keyword(s):

Optimal Design ◽

Aluminum Foam ◽

Failure Behavior ◽

Foam Core ◽

Sandwich Beams ◽

Three Point Bending

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Aluminum Foam Sandwich with Different Face-Sheet Materials under Three-Point Bending

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.872.25 ◽

2017 ◽

Vol 872 ◽

pp. 25-29 ◽

Cited By ~ 1

Author(s):

Chang Yan ◽

Xu Ding Song ◽

Shuo Feng

Keyword(s):

Stainless Steel ◽

Aluminum Alloy ◽

Aluminum Foam ◽

Sheet Material ◽

Face Sheet ◽

304 Stainless Steel ◽

Foam Core ◽

6061 Aluminum Alloy ◽

Three Point Bending ◽

Sheet Materials

Aluminum foam sandwich structure is a new type of composite material with excellent mechanical and functional properties. As it is known that properties of aluminum foam sandwiches (AFS) vary if the foam core is sandwiched between different face sheets. To study the effects of face-sheet materials on the mechanical properties of AFS and enable a better understanding of the usage of such AFS structures under flexural load, AFS sandwiched by 6061-aluminum alloy face-sheets and 304 stainless steel face-sheets were fabricated and investigated under three-point bending by using WDW-T100 electronic universal tensile testing machine. Results showed that 6061-aluminum alloy reinforced AFS had the same peak load value with 304-stainless steel reinforced one almost so long as the thicknesses of the face-sheet material were the same and the foam core densities were the same too, but the energy absorption ability of 304-stainless steel reinforced AFS was much higher than that of 6061-aluminum alloy reinforced. However, the integrality of the 6061-sandwiched AFS was better than 304-sandwiched AFS. Deformation modes of the two types of AFS were also discussed in the present study.

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The response of pin-clamped carbon fibre-reinforced plastics composite sandwich beams with polyvinylchloride foam core under bending impact

Journal of Reinforced Plastics and Composites ◽

10.1177/0731684420910794 ◽

2020 ◽

Vol 39 (9-10) ◽

pp. 384-405

Author(s):

Umut Caliskan ◽

M Kemal Apalak

Keyword(s):

Failure Mechanism ◽

Sandwich Beam ◽

Sheet Thickness ◽

Adhesive Layer ◽

Failure Criteria ◽

Face Sheet ◽

Foam Core ◽

Sandwich Beams ◽

Composite Sandwich ◽

Fibre Angle

The dynamic response of pin-clamped composite sandwich beam in terms of face-sheet effect with polyvinylchloride foam core subjected to bending impact loading was investigated in this paper. Composite sandwich beams with three different unidirectional skin layups of [0]4, [45]4 and [90]4 and two types of face-sheet thickness of 1 ([0]4) and 2 ([0]8) mm were fabricated. An explicit code, VUMAT, is written and implemented in ABAQUS/Explicit. The micro-computerised tomography scanning was used to detect adhesive layer failure. The ply angle orientation of face sheets plays an important role in the failure mechanism of the sandwich beam under bending loads. Although it is known that the fibre angle in the direction perpendicular to the bending direction is more stiff and strength, damage tolerances under bending impact loads of beams with other fibre angles were determined. In addition, as the number of layers increased, failure mechanism and load-carrying capacity of composite face sheets changed completely for increasing bending stiffness. This research provides fundamental information about the change of the failure mechanisms as the fibre angle and thickness of the face sheet were changed and in terms of interpretation with the help of finite elements using different failure criteria.

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