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Showing 1 to 20 of 29 for “"interlaminar stresses"”.
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Interlaminar stresses in composite laminates: a perturbation analysis
… investigations, predicts smooth continuous interlaminar stresses with no instabilities, determines the finite maximum intensity for the interlaminar normal stress σ<sub>𝒛</sub> in all laminates, provides mathematical evidences for the singular stresses τ<sub>xz</sub> and τ<sub>yz</sub> in …
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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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An analysis of interlaminar stresses in unsymmetrically laminated plates
The results of a numerical study of interlaminar stresses within unsymmetrically laminated plates is presented. The focus of the study is upon the linear thermoelastic response of thin square laminated composite plates subjected to extensional, compressive, or thermal loading. Symmetric and …
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Computation of interlaminar stresses from finite element solutions to plate theories
Interlaminar stresses are estimated from plate theories by equilibrium. The elasticity equations of equilibrium are integrated with respect to the thickness coordinate z using the linear distribution in z of the in-plane stresses. This procedure, for example, requires fourth order derivatives of …
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An efficient semi-analytic method for the calculation of interlaminar stresses around holes
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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A stepwise methodology for the calculation of interlaminar stresses in transversely-loaded grooved laminates
… in the development of a model to determine the interlaminar stress fields and the mechanisms that give rise to these stress fields in transversely-loaded grooved composite laminates was developed. The methodology consists of five steps, with each step representing a laminate configuration with …
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Interlaminar stress analysis of dropped-ply laminated plates and shells by a mixed method
… is developed for the linear analysis of interlaminar stresses in laminated composites, with special interest in laminates that contain terminated internal plies (dropped-ply laminates). Two models are derived, one for problems of generalized plane deformation and the other for the …
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Integrated Sinc Method for Composite and Hybrid Structures
… use of integrated Sinc methods for predicting interlaminar failure in laminated composites and hybrid material systems was examined. Because the Sinc methods first approximate the highest-order derivative in the governing equation, the in-plane derivatives of in-plane strain needed to obtain …
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Role of delamination and interlaminar fatigue in the failure of laminates with ply dropoffs
… with ply dropoffs to better understand the interlaminar stress field and delamination/damage characteristics in such laminates, as well as the relationship between the two based on the strength of materials approach. To gain key insights into the mechanisms and structural parameters that …
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Response and failure analysis of a graphite-epoxy laminate containing terminating internal plies
… acts as a stress riser for both intralamina and interlaminar stresses. This laminate configuration is referred to as a ply drop. The linear elastic, three-dimensional stress distributions in the vicinity of a ply drop are determined for a graphite-epoxy laminate subject to axial tension and …
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Finite element stress analysis of idealized composite damage zones
… to the boundary layer along the free edges. 2. Interlaminar stresses in the boundary layer around the damage zone are similar to those produced at the free edge. 3. The interlaminar stresses around the damage zone may be as large or larger than those at the free edge depending upon the fiber …
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Analysis and design of composite curved frames
… is predicted using polynomial in-plane and interlaminar failure criteria. Interlaminar stresses can be directly computed only from three-dimensional finite element models, but the computational expense of these models is prohibitive. Therefore, approximate two-dimensional analysis methods …
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A study of the mechanical behavior of a 2-D carbon-carbon composite
… the modes of failure. Failure was found to be interlaminar, with cracks propagating along the fiber-matrix interface. Finite element analyses of a two-ply carbon-carbon composite under in-plane, out-of-plane, and thermal loading were performed. Stress distributions were studied as a function of …
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Nonlinear response and failure characteristics of internally pressurized composite cylindrical panels
… edges where the local bending gradients and interlaminar stresses are maximum. STAGS nonlinear two-dimensional shell analysis computer code results are used to identify regions of the panels where the response is independent of the axial coordinate. A geometrically nonlinear one-dimensional …
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Finite element analysis of damaged cross-ply composite laminates
… was also studied for several crack spacings. Interlaminar stresses were predicted to form as a result of the free surface of the crack. The crack tip also caused all the nonzero stresses to exhibit singular behavior at the crack tip.
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Stress distribution around holes in laminated composite plates
… and stress couples around the hole, the interlaminar stresses, as well as the tangential stress through the plate thickness are studied. In addition, the boundary layer phenomenon in the vicinity of the hole is presented.
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Reliability and failure analysis of composite beams and plates containing stress concentrations
… for the three-dimensional stress field including interlaminar stresses. The effect of interlaminar stresses on the total reliability is investigated. Various failure theories for composite materials are reviewed. New failure criteria for bi-directional orthotropic lamina are developed and …
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On a generalized laminate theory with application to bending, vibration, and delamination buckling in composite laminates
… prediction of stress distributions, including interlaminar stresses, is obtained by using the Generalized Laminate Plate Theory of Reddy in which layer-wise linear approximation of the displacements through the thickness is used. Analytical, as well as finite-element solutions of the theory, …
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Global-local finite element analysis of laminated composites
… element approach was used to investigate the interlaminar stresses in laminated composite plates with a central circular hole. Detailed solutions were sought for the interlaminar normal stress distributions close to the free straight edge of the plate as well as around the edge of the hole. …
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Effect of cooling rate and stacking sequence on the fatigue behavior of notched quasi-isotropic APC-2 laminates
… was performed to compare the differences in the interlaminar stresses arising around the notch in the specimens of the two layups under study. The ultimate static strengths did not show any appreciable dependence on either cooling rate or stacking sequence. The maximum load in the fatigue cycle …
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