Transverse Moduli Effect on Dilatation and Through-Thickness Poisson’s Ratio of Composite Laminates

Yeh, Hsien-Liang; Yeh, Hsien-Yang

doi:10.1106/gb38-g2jw-7vaw-pt40

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…6,7 As reported by Herakovich, and, more recently, by others interested in the possibilities of negative Poisson's ratios, high values of the ratio, E 1 /G 12 , for the ply tend to promote low and eventually negative through-thickness Poisson's ratios. 8,[11][12][13] This can be seen in Figure 2, where unrelaxed carbon epoxy Gibson 3491…”

Section: Through-thickness Shear Modulimentioning

confidence: 89%

“…Figures 2 and 3 show values of the principal throughthickness Poisson's ratios for angle-ply laminates. It is worth noting that equations (10) and (11) are equivalent to the procedure described by Herakovich. 6,7 As reported by Herakovich, and, more recently, by others interested in the possibilities of negative Poisson's ratios, high values of the ratio, E 1 /G 12 , for the ply tend to promote low and eventually negative through-thickness Poisson's ratios.…”

Section: Through-thickness Shear Modulimentioning

confidence: 99%

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Through-thickness elastic constants of composite laminates

Gibson

2012

Journal of Composite Materials

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This article presents relationships for the through-thickness elastic constants of composite laminates, needed for modelling three-dimensional stress problems. Using the individual ply elastic constants together with the in-plane laminate elastic constants (from laminate theory) results in explicit relationships for, 13 , 23 , E 3 , G 13 and G 23 . The Poisson's ratio and Young's modulus expressions apply to all laminate types. The shear modulus relationships apply to balanced laminates, but are extendable to other laminate types. Relationships are developed here for angle-ply, cross-ply and quasi-isotropic laminates. Results are presented for glass/epoxy and carbon/epoxy laminates, above and below the resin T g . The importance of coupling stresses and their influence on 13 , 23 and E 3 is underlined. It is shown, for instance, that equating the laminate through-thickness modulus to the individual ply value can result in a significant under-estimate.

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Section: Through-thickness Shear Modulimentioning

confidence: 89%

Section: Through-thickness Shear Modulimentioning

confidence: 99%

Through-thickness elastic constants of composite laminates

Gibson

2012

Journal of Composite Materials

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Static and dynamic analyses of auxetic hybrid FRC/CNTRC laminated plates

Huang

Yang

Azim

et al. 2020

Nanotechnology Reviews

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In this work, a hybrid laminated plate is developed by changing ply orientations and stacking sequences. The hybrid laminated plate is composed of carbon nanotube reinforced composite and fiber reinforced composite layers. Negative Poisson’s ratio (NPR) is obtained for the case of [22F/(22C/−22C)3T/−22F] laminate. A theoretical laminated model considering geometric nonlinearity and shear deformation is presented. Based on a two-step perturbation method, the solutions of the motion equations are obtained to capture the nonlinear frequencies and load–deflection curves. On this basis, the fourth-order Runge–Kutta method is used to obtain the dynamic response of hybrid laminated plates. The presented model is verified by comparing the results obtained analytically and numerically. Several factors such as loading and distribution of carbon nanotubes (CNTs), and foundation type are considered in parametric study. Numerical results indicate that the thermal-mechanical behavior of hybrid laminated plates significantly improved by properly adjusting the CNT distribution. In addition, the results reveal that changes in temperature and foundation stiffness have pronounced influence on the nonlinear vibration characteristics of hybrid laminate plates with NPR as compared to those with positive Poisson’s ratio.

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Transverse Moduli Effect on Dilatation and Through-Thickness Poisson’s Ratio of Composite Laminates

Cited by 2 publications

References 10 publications

Through-thickness elastic constants of composite laminates

Through-thickness elastic constants of composite laminates

Static and dynamic analyses of auxetic hybrid FRC/CNTRC laminated plates

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