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Showing papers on "Composite laminates published in 1971"


Journal ArticleDOI
TL;DR: In this article, an approach is presented to predict the detailed stacking sequence of specific layer orientations which leads to optimum protection against delamination under uniaxial static and fatigue loadings.
Abstract: Based upon considerations relating to the nature of the interlaminar stresses in composite laminates, an approach is presented to predict the detailed stacking sequence of specific layer orientations which leads to optimum protection against delamination under uniaxial static and fatigue loadings. In particular, it is argued that the interlaminar normal stress as well as the interlaminar shear stress, is instrumental in precipitating delamination and subsequent strength degradation. Correlation with existing experimental evidence of the stacking sequence phenomenon is presented.

317 citations



Journal ArticleDOI
TL;DR: In this article, exact solutions within the framework of linear elasticity theory were developed and compared to the respective solutions governed by CPT, and numerical data calculated based on simple harmonic load distributions have indicated rather wide discrepancy between the two solutions for laminates having low span to depth ratios.
Abstract: In a series of three papers [1,2,3], the range of applicability of classical laminated plate theory (CPT) in describing the response of composite laminates under static bending has been examined. Briefly, exact solutions within the framework of linear elasticity theory were developed and compared to the respective solutions governed by CPT [4,5,6]. Numerical data calculated based on simple harmonic load distributions have indicated rather wide discrepancy between the two solutions for laminates having low span-to-depth ratios. At high aspect ratios however, the CPT solution is in good agreement with the elasticity solution.

60 citations


Journal ArticleDOI
G.A. Cooper1
TL;DR: In this article, a review of the mechanical properties of composite materials is presented, divided into six sections: introduction, elastic-plastic properties, fracture, cracks and notches, creep and fatigue.
Abstract: The mechanical behaviour of composite materials is examined. As far as is possible, the subject is discussed in terms of general principles, and the aim throughout has been to relate the behaviour of the composite to the geometrical arrangement and the properties of the component phases. Since the greatest advances have been made in the understanding of unidirectional fibrous composites these are given prominence, but where possible the discussion is made to include laminates and other structures. The review is divided into six sections: introduction, elastic-plastic properties, fracture, cracks and notches, creep and fatigue

24 citations




Journal ArticleDOI
TL;DR: In this article, a photoelastic method is used for the study of wave propagation in composite materials and the results show that the wave front is approaching a steady state and propagating with unchanging wave shape.
Abstract: In [1], a theory is proposed by Chou and Wang for the calculation of elastic wave front speeds in unidirectional composite materials. A basic assumption employed in the theory states that after a brief initial transient period, the wave front attains a steady state and propagates with unchanging wave shape. The purpose of this paper is to present a preliminary experimental justification of this assumption. Although the results are not conclusive, they do show that the wave front is approaching a steady state. This paper also demonstrates that the photoelastic method is suitable for the study of wave propagation in composite materials. High speed photography and dynamic photoelasticity are used for testing a photoelastic composite model. The test specimen, shown in Figure 1, consists of two bonded plastic reference plates of PSM-IB* and S-16°°, mounted opposite to

3 citations



01 Oct 1971
TL;DR: In this paper, the elasticity solutions for the response of unidirectional and bidirectional laminates are presented in detail and compared to corresponding results given by classical lamination theory.
Abstract: : The results of elasticity solutions for the response of unidirectional and bidirectional laminates are presented in detail and compared to corresponding results given by classical lamination theory Laminates under uniformly distributed and concentrated loadings are treated (Author)

2 citations