Analytical Solutions to Predict Flexural Behavior of Curved Sandwich Beams

Wang, W.; Shenoi, R.A.

doi:10.1177/1099636204032855

Cited by 10 publications

(2 citation statements)

References 10 publications

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“…The solution to the structure shown in this figure has already been used by other authors to solve similar problems. Naik et al [60] used it to study weave fabric composites and Wang and Shenoi [61] to study curved sandwich beams.…”

Section: Representative Volume Element To Solve the Fiber Buckling Prmentioning

confidence: 99%

Numerical Simulation of Matrix Reinforced Composite Materials Subjected to Compression Loads

Martı́nez

Oller

2009

Arch Computat Methods Eng

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This paper reviews the most common formulations to obtain the compression strength of long fiber composites due to fiber buckling. This failure mode was first studied by Rosen (Fibre Composite Materials, pp. 37-45, 1965) who defined two different fiber buckling modes, extensional and transverse. Further studies improved the first model proposed by Rosen by defining with more accuracy the mechanics of the problem. Although each formulation use a different approach to solve the problem, all of them agree in the dependence of fiber buckling on three main parameters: matrix shear strength, fiber initial misalignments and volumetric participation of the fibers in the composite.Once having described the different approaches used, and the parameters on which they depend, this paper describes a new formulation capable of obtaining the compression strength of composites taking into account the fiber buckling phenomenon. This formulation uses the serial/parallel mixing theory developed by Rastellini et al. (Comput. Struct. 86(9):879-896, 2008) to simulate the composite, and takes advantage of knowing the mechanical performance of the composite constituents to simulate the fiber buckling phenomenon. This is done with an homogenization procedure. It consists in introducing the interaction between fibers and matrix into their respective constitutive equations. The interaction between fiber and matrix takes into account fiber initial misalignments, its volumetric participation and the mechanical properties of both constituents.The new formulation proposed is implemented in a finite element code, taking into account that fibers can have different misalignment levels, and that the composite behaves differently if it is under tensile or compression forces. The mechanical performance of the formulation proposed is studied with several finite element simulations of compressed composites. Finally, the correctness of the formulation is proved by comparing the numerical results with the experimental tests provided by Barbero and Tomblin (Int.

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Section: Representative Volume Element To Solve the Fiber Buckling Prmentioning

confidence: 99%

Numerical Simulation of Matrix Reinforced Composite Materials Subjected to Compression Loads

Martı́nez

Oller

2009

Arch Computat Methods Eng

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“…In a 3D sandwich structure with a thermoformed foam core, foam in the straight segments of the sandwich structure has mainly experienced stretching during thermoforming [24] and is primarily responsible for carrying transverse shear loads. Foam at the corners (or in curved segments) of the sandwich structure has mainly experienced bending during thermoforming [24] and is primarily responsible for bearing radial stress (through-thickness stress) [79–83]. As foam at the corners experienced concentrated strains during thermoforming, significant change in mechanical properties might occur there.…”

Section: Thermoforming Of Foam Coresmentioning

confidence: 99%

A review on manufacture of polymeric foam cores for sandwich structures of complex shape in automotive applications

Chen

Das

2021

Jnl of Sandwich Structures & Materials

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In this work, polymeric foam thermoforming, foam injection moulding, bead foaming and film foaming were reviewed in an effort to explore feasible processes to manufacture sandwich structures of complex geometry for automotive applications. Injection moulded foams generally suffer from high density, poor cell morphologies and unnecessary skin layers. Foamable films currently available are pressure-induced. In order for foamable films to produce foam, high uniformly-distributed pressure needs to be applied, which makes it difficult to manufacture foam parts of three-dimensional complex geometry with foamable films. The majority of commercial high-performance foam cores can be thermoformed. Ideally, thermoformed foam cores would have good mechanical properties if high-performance foam sheets are used. However, the mechanical properties of foams might be reduced during the process of thermoforming, especially around corners. Bead foaming offers a high level of freedom in foam geometry to be moulded, and inserts can be integrated into foam cores during the process of moulding. Moreover, foam cores with high density in high stressed areas and low density in low stressed areas can be manufactured with foam beads of different densities. However, due to nonhomogeneous degree of fusion and weak bonds and voids between beads, bead foams generally show mechanical properties lower than their block counterpart. Relatively speaking, thermoforming with high-performance foam sheets and moulding with high-performance foam beads hold great potentials for mass production of sandwich cores of complex geometry for automotive applications. However, further investigation on the mechanical properties of thermoformed foams and high-performance bead foams is still in need to confirm their suitability.

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Local Free Vibration Analysis of Initially Stressed Curved Sandwich Beams

Wang

Shenoi

Sandwich Structures 7: Advancing With Sandwich Structures and Materials

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Analytical Solutions to Predict Flexural Behavior of Curved Sandwich Beams

Cited by 10 publications

References 10 publications

Numerical Simulation of Matrix Reinforced Composite Materials Subjected to Compression Loads

Numerical Simulation of Matrix Reinforced Composite Materials Subjected to Compression Loads

A review on manufacture of polymeric foam cores for sandwich structures of complex shape in automotive applications

Local Free Vibration Analysis of Initially Stressed Curved Sandwich Beams

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