NDLI: Damage growth in composite laminates with interleaves

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Damage growth in composite laminates with interleaves

Content Provider	NASA Technical Reports Server (NTRS)
Author	Goree, James G.
Copyright Year	1987
Description	The influence of placing interleaves between fiber reinforced plies in multilayered composite laminates is investigated. The geometry of the composite is idealized as two dimensional, isotropic, linearly elastic media made of a damaged layer bonded between two half planes and separated by thin interleaves of low extensional and shear moduli. The damage in the layer is taken in the form of a symmetric crack perpendicular to the interface and may extend up to the interface. The case of an H-shaped crack in the form of a broken layer with delamination along the interface is also analyzed. The interleaves are modeled as distributed shear and tension springs. Fourier integral transform techniques are used to develop solutions in terms of singular integral equations. An asymptotic analysis of the integral equations based on Muskhelishvili's techniques reveals logarithmically singular axial stresses in the half plane at the crack tips for the broken layer. For the H shaped crack, similar singularities are found to exist in the axial stresses at the interface crack tips in the layer and the half plane. The solution of the equations is found numerically for the stresses and displacements by using the Hadamard's concept of direct differentiation of Cauchy integrals as well as Gaussian integration techniques.
File Size	3029312
Page Count	112
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870017551
Archival Resource Key	ark:/13960/t9w13zh3k
Language	English
Publisher Date	1987-08-15
Access Restriction	Open
Subject Keyword	Composite Materials Shear Properties Interlayers Damage Assessment Tensile Stress Fourier Transformation Integral Equations Delaminating Fiber Composites Ply Orientation Laminates Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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