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Showing 1 to 20 of 138 for “"Composite laminates"”.
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Edge caps for reinforcing composite laminates
… cap designs are evaluated. A three-dimensional composite failure criterion and finite element analysis are used in a progressive laminate failure analysis to predict the failure load of the reinforced luminate. The results of an experimental program are presented. Cappad laminates are shown to …
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Process-Induced Viscoelastic Stress in Composite Laminates
… developed in evaluating the stress response of composite laminates which is associated with cooling the material system from the cure temperature to room temperature. The present research examines the fundamental nature of time-dependent residual-thermal stresses in composite laminates which are …
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Analysis of Composite Laminates with Matrix Cracks
Analysis of the effects of matrix cracking on composite laminates is a well-known problem which has attracted considerable attention for the past decade. An approximate analytical solution is introduced in this thesis to study this type of problem. The subjects of primary concern are the …
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Geometrically Nonlinear Stress Recovery in Composite Laminates
Composite laminates are increasingly being used as primary load bearing members in<br />structures. However, because of the directional dependence of the properties of<br />composite materials, additional failure modes appear that are absent in<br />homogeneous, isotropic materials. Therefore, a …
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Analysis of shear test methods for composite laminates
… test specimens for in-plane shear response of composite materials subjected to mechanical or thermal loads is presented. The shear test specimens investigated include: slotted coupon, cross beam, Iosipescu, and rail shear. Results are presented in the form of normalized stress contour plots for …
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Large strain flexural testing of thin composite laminates
Carbon fiber composites are of significant interest for use in deployable space structures. Elastically folded thin laminates can be utilized as hinge mechanisms in structural systems such as solar arrays, reflectors, and instrument booms, allowing for compact packaging during launch to orbit. …
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Progressive Failure Analysis of Double-Notched Composite Laminates
Failure analysis in composite laminates is traditionally modeled by the material property degradation method for the in-plane damage prediction which assumes that a damage material can be replaced by an equivalent material with degraded properties. The delamination in composites, on the other hand, …
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Dynamic Analysis of Interfacial Cracks in Composite Laminates
The interfacial crack in composite laminates has been of great interest as composite materials are widely used today. In this paper, the order of dynamic stress singularity of interfacial cracks is derived, and a hybrid finite element method is successfully developed for this problem. Both the …
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Interlaminar stresses in composite laminates: a perturbation analysis
… of solution for an elastic balanced symmetric composite laminate subject to a uniaxial extension has been developed based upon a perturbation analysis of a limiting free body containing an interfacial plane. The solution satisfies more physical requirements and boundary conditions than previous …
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Thermoviscoelastic characterization and predictions of Kevlar/epoxy composite laminates
… of Kevlar 49/Fiberite 7714A epoxy composite lamina and the development of a numerical procedure to predict the viscoelastic response of any general laminate constructed from the same material. The four orthotropic material properties, S₁₁, S₁₂, S₂₂, and S₆₆, were characterized by 20 …
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Measurement of resin pressure in composite laminates during cure
… method of measuring the resin pressure within a composite laminate during processing has been developed. This method can be used to investigate the control of voids, or resin flow and laminate compaction in several composite material processing methods such as ACND, hot press curing and resin …
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Interlaminar stresses at straight free edges of composite laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics; and, (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1985.
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Microcracking in composite laminates under thermal and mechanical loading
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Finite element analysis of damaged cross-ply composite laminates
… cracks in T300/5208 graphite-epoxy cross-ply laminates was studied using generalized plane strain finite element analysis. The degradation of elastic modulus, Poisson's ratio, shear modulus, and coefficient of thermal expansion was predicted and then compared with analytical models and …
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Crack Growth Mechanisms under Anti-Plane Shear in Composite Laminates
… associated with crack growth in polymer matrix composite laminates subjected to anti-plane shear (mode III) loading. For mode III split-beam test methods were proposed, and initial evaluations were conducted. A single test method was selected for further evaluation. Using this test method, it …
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Postbuckling Analysis of Delaminated Composite Plates Under Compression (Composite Laminates)
Failure mechanics of delamination problems in composite laminates under compression is investigated. The failure modes in general may include prebuckling, postbuckling, delamination growth and final failure. Buckling load is determined by solving an eigenvalue problem using a subspace iteration …
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Delamination growth in graphite/epoxy composite laminates under tensile loading
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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The application of composite laminates in strengthening concrete cross ties
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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Finite Element Modeling of Tow-Placed Variable-Stiffness Composite Laminates
… made it possible to manufacture curved-fiber composite tow paths. A composite structure with curved-fiber tow paths can be formed in a manner similar to filament winding. The result is a laminate with spatially varying stiffness and response. This manufacturing method can also result in …
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