Analytical investigation of thermal and mechanical load effects on stress distribution in adhesive layer of double-lap metal-composite bonded joints

Kumazawa, Hisashi; Kasahara, Toshiyuki

doi:10.1080/09243046.2019.1575028

Cited by 16 publications

(2 citation statements)

References 9 publications

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“…Lap-shear joints formed in such applications develop large out-of-plane peel stresses 120,121 and undergo a significant reduction in ultimate strength. 122,123 Moreover, metal liners add to the overall weight and reduce the amount of usable cryogenic fuel. However, progress has yet to be made in addressing some of these issues with metallic liners.…”

Section: Linersmentioning

confidence: 99%

A review on gas permeability of polymer matrix composites for cryogenic applications

Saha,

Sullivan

2024

Journal of Composite Materials

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Fiber-reinforced polymer matrix composites are increasingly considered for lightweight cryogenic pressure vessels due to their excellent combination of tailorability, specific mechanical properties, and relatively low coefficients of thermal expansion. However, significant challenges must be overcome to fully utilize PMCs for cryogenic fuel tanks in terms of transverse microcracking and subsequent permeation of cryogenic fuel. Gas permeation and microcrack densities of cryogenically cycled composites are highly influenced by their layup, ply thickness, load case, and manufacturing defects like voids and resin rich zones. There has been a significant amount of research on measuring gas permeation of composites fatigued under pure thermal or uniaxial thermo-mechanical stresses. However, results demonstrate that the gas permeability should be measured under biaxial thermo-mechanical stresses to properly gauge the leakage characteristics of damaged composites. This paper summarizes the results from over a hundred papers on the key parameters that influence the gas permeability of composites, appropriate testing methods to cycle composites for permeability measurement, methods to limit the evolution of transverse microcracks, and materials traditionally used for the fabrication of all-composite cryogenic fuel tanks. Thin plies and nanofiller-toughening of the matrix have been shown to provide significant improvements in transverse microcrack suppression within cryogenically cycled composites.

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Section: Linersmentioning

confidence: 99%

A review on gas permeability of polymer matrix composites for cryogenic applications

Saha,

Sullivan

2024

Journal of Composite Materials

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“…One of the most effective methods for stress concentration reduction is application of the scarf joints, i.e., the joints with variable thickness of joining articles along the length. Realization of symmetrical double-lap joints makes it possible to eliminate structure bending and reduce the tear-off stress in the adhesive [9][10][11]. Application of laminated composites is also one of the stipulated realizations of joints with stepped thickness variation along joint length [12].…”

Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Kurennov,

Barakhov,

Polyakov

et al. 2022

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The problem of optimal design of symmetrical double-lap adhesive joint is considered. It is assumed that the main plate has constant thickness, while the thickness of the doublers can vary along the joint length. The optimization problem consists in finding optimal length of the joint and an optimal cross-section of the doublers, which provide minimum structural mass at given strength constraints. The classical Goland-Reissner model was used to describe the joint stress state. A corresponding system of differential equations with variable coefficients was solved using the finite difference method. Genetic optimization algorithm was used for numerical solution of the optimization problem. In this case, Fourier series were used to describe doubler thickness variation along the joint length. This solution ensures smoothness of the desired function. Two model problems were solved. It is shown that the length and optimal shape of the doubler depend on the design load.

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Numerical and experimental evaluation of the formation of leakage paths through CFRP cross-ply laminates with leak barrier layers

Hamori

Kumazawa

Higuchi

et al. 2019

Composite Structures

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Analytical investigation of thermal and mechanical load effects on stress distribution in adhesive layer of double-lap metal-composite bonded joints

Cited by 16 publications

References 9 publications

A review on gas permeability of polymer matrix composites for cryogenic applications

A review on gas permeability of polymer matrix composites for cryogenic applications

Archive of Mechanical Engineering

Numerical and experimental evaluation of the formation of leakage paths through CFRP cross-ply laminates with leak barrier layers

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