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Journal ArticleDOI

Interlaminar Stresses in Composite Laminates Under Uniform Axial Extension

01 Oct 1970-Journal of Composite Materials (SAGE Publications)-Vol. 4, Iss: 4, pp 538-548
TL;DR: In this article, the response of a finite-width composite laminate under uniform axial strain is treated through the application of classical elasticity theory, and finite-difference solution techniques are employed to obtain solutions for stresses and displacements throughout the region.
Abstract: The response of a finite-width composite laminate under uniform axial strain is treated through the application of classical elasticity theory. Finite-difference solution techniques are employed to obtain solutions for stresses and displacements throughout the region. Results for material properties typical of a high modulus graphite-epoxy composite material system are presented which explain the mechanism of shear transfer within a symmetric laminate. In addition, results of this work are compared to those given in a recent approximate formulation.
Citations
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Zvi Hashin1
TL;DR: In this paper, the authors review the analysis of composite materials from the applied mechanics and engineering science point of view, including elasticity, thermal expansion, moisture swelling, viscoelasticity, conductivity, static strength, and fatigue failure.
Abstract: The purpose of the present survey is to review the analysis of composite materials from the applied mechanics and engineering science point of view. The subjects under consideration will be analysis of the following properties of various kinds of composite materials: elasticity, thermal expansion, moisture swelling, viscoelasticity, conductivity (which includes, by mathematical analogy, dielectrics, magnetics, and diffusion) static strength, and fatigue failure.

2,216 citations

Journal ArticleDOI
TL;DR: In this paper, a methodology to determine the constitutive parameters for the simulation of progressive delamination is proposed, which accounts for the size of a cohesive finite element and the length of the cohesive zone to ensure the correct dissipation of energy.

1,314 citations

Journal ArticleDOI
TL;DR: The status of research on damping in fiber-reinforced composite materials and structures with emphasis on polymer composites has been reviewed in this article, where the authors present damping studies involving macromechanical, micro-mechanical and viscoelastic (relaxation and creep) approaches.

571 citations

Journal ArticleDOI
01 Dec 1972
TL;DR: The effect of interfaces on mechanical properties is considered in this paper, with emphasis on dislocation mechanisms and the atomic scale structure of boundaries, and Elastic and plastic compatibilities at boundaries are treated.
Abstract: The effect of interfaces on mechanical properties is considered. Elastic and plastic compatibilities at boundaries are treated. Specific influences at both low and high temperatures are discussed, with emphasis on dislocation mechanisms and the atomic scale structure of boundaries.

562 citations

Journal ArticleDOI
TL;DR: In this article, an improved finite element procedure is developed to investigate the stress field in symmetrically laminated composites of finite dimensions, focusing on assessing the singular behavior of stresses in regions close to ply-interfaces and the exposed free edge.
Abstract: An improved numerical (finite element) procedure is developed to investigate the stress field in symmetrically laminated composites of finite dimensions Emphasis is placed on assessing the singular behavior of stresses in regions close to ply-interfaces and the exposed free edge An accurate evaluation of these stresses will help to better understand the failure process of composite laminates Mechanical load in the form of uniaxial tension and environmental variables such as temperature and humidity exposures are considered in the formulation Results tor lam inates under uniaxial tension are presented in this paper; thermal and hygroscopic stresses will be reported in a subsequent paper

417 citations


Cites background or methods or result from "Interlaminar Stresses in Composite ..."

  • ...The analytical work in [1] and [2] is based on a linear elastic, generalized plane-strain formulation; and numerical solutions are obtained using a finite-difference procedure....

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  • ..., found in [1] in edge stresses, their agreement in the displacement solutions...

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  • ...found in [1] differ with the present results only near the free-edge region....

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  • ...The problem of a finitewidth, symmetrically laminated composite plate under uniform one-dimensional stretch has been studied by Pipes and Pagano [1, 2] ....

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References
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Journal ArticleDOI

1,002 citations


"Interlaminar Stresses in Composite ..." refers background in this paper

  • ...It has been shown by Bogy [8] and discussed by Hess [9], that for bonded quarterplanes of dissimilar materials, a singularity in the stress field exists at the...

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Journal ArticleDOI

589 citations


"Interlaminar Stresses in Composite ..." refers background in this paper

  • ...T HE ANALYTICAL TECHNIQUE for determining the in-plane, elastic response ~* of a laminated composite, termed lamination theory ( LT ), is based upon the assumption that a state of plane stress exists for symmetric ( B~~ = 0 ) laminates under in-plane tractions [1]....

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Journal ArticleDOI
TL;DR: In this article, an analysis of interlaminar shear stresses is performed for a laminate under generalized plane stresses, where the laminate is modeled as a set of anisotropic layers separated by isotropic adhesive layers.
Abstract: An analysis of interlaminar shear stresses is performed for a lami nate under generalized plane stresses. The laminate is modeled as a set of anisotropic layers separated by isotropic adhesive layers. The corresponding equilibrium differential equations are developed and solved for laminates of infinite and finite width. In the first case, it is shown that the interlaminar shear stress is zero everywhere, while in the latter case, this stress attains finite maximum values at the edges of the strip. These results are important when interpreting strength data obtained from uniaxial tests.

245 citations


"Interlaminar Stresses in Composite ..." refers background or methods in this paper

  • ...Results of an approximate formulation of the present problem have been presented recently by Puppo and Evensen [4]....

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  • ...However, when the laminate is composed of layers of different orientations, lamination theory implies boundary tractions on a free edge which cannot exist [2-5]....

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  • ...Puppo and Evensen [4] correctly pointed out that in...

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