Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 61 for “"Laminated Composites"”.
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Magnetoelectric laminated composites and devices
… magnetoelectric (ME) effects have been found in laminated composites of piezoelectric and magnetostrictive layers. Compared to ME single phase and two phase particulate composites, laminated composites have much higher ME coefficients and are also readily fabricated. In this thesis, I have …
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Engineered Alumina / Silicon Carbide Laminated Composites
… limited mechanical reliability. Several ceramic composites and, in particular, laminated structures have been developed in recent years to enhance strength, toughness and to improve flaw tolerance. Significant strength increase and improved mechanical reliability, in terms of Weibull modulus or …
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Self-healing laminated composites from prepreg fabrics
Fiber-reinforced polymeric (FRP) composites are eminent engineering materials for structural applications due to their high strength-to-weight ratios. During their service life, FRP composites are often exposed to severe conditions leading to fatigue-induced damage. This damage mode is complex and …
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The finite element analysis of laminated composites
Laminated plates with homogeneous isotropic layers in bending and extension were investigated by an analytical method.
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Micromechanics-Based Analysis of Fiber-Reinforced Laminated Composites
… nonlinear material modelling of fiber-reinforced laminated composites is presented. The material modelling procedure has a two-level hierarchical structure. At the bottom level, constitutive information about the fiber and the matrix phases are synthesized using a micromechanical model to yield …
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Fatigue behavior of drilled T300/PEEK laminated composites
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1993
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Global-local finite element analysis of laminated composites
… 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. The Global model was …
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Vibration, buckling and postbuckling of laminated composites with delaminations
… vibration, buckling and postbuckling analyses of laminated composite plates with multiple delaminations are presented. A fInite element method based on a layer-wise laminated composite plate theory is developed to formulate the problem. Geometric nonlinearity in the sense of von Karman and the …
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Theory of ultrasonic diffraction by damage developed in thin laminated composites
This thesis provides a general theory of the diffraction of ultrasonic waves. The theory is then used to find the apparent attenuation which would result if certain damage states (transverse cracks and delaminations) are introduced into a graphite/epoxy laminate through which the ultrasonic wave …
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Nonlinear analysis of free-edge effects in laminated composites under axial loading
A finite element model based on the quasi-three dimensional displacement field of Pipes and Pagano [1] with nonlinear strain-displacement relations is developed to study the free edge problem of composite laminates. Numerical results are presented to show the difference between the results of the …
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The effects of porosity on the out-of-plane tensile strength of laminated composites
The objective of this study was to investigate the out-of-plane tensile strength of graphite/epoxy laminates as a function of porosity. An experimental test program was designed to apply tension to the faces of circular graphite/epoxy specimens in a direction perpendicular to the laminate …
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Delamination in fiberglass pre-impregnated laminated composites from ultrasonic a-scan signal using artificial intelligence
… delamination (IID) in fiberglass pre-impregnated laminated composites (FGLC) is an important failure mode. Besides affected the material strength and structural reliability, this failure mode normally present minor damage on the surface but the internal damage may extensive. Existing detection …
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DEVELOPMENT AND IN-SITU CHARACTERIZATION OF BI-LAYERED LAMINATED COMPOSITES FOR ENHANCED MOISTURE BARRIER PERFORMANCE
… The diffusivity of both the bi-layered composites and the pure encapsulation materials was assessed using two distinct experimental methods for the calculation of diffusivity based on the principles of 1-dimensional Fick's law of diffusion. The diffusivities were statistically analyzed …
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Interlaminar Deformation at a Hole in Laminated Composites: A Detailed Experimental Investigation Using Moire Interferometry
… cylindrical surfaces of holes in tensile loaded laminated composite specimens was measured using new moire interferometry techniques. These new techniques were developed and evaluated using a 7075-T6 aluminum control specimen. Grating replication techniques were developed for replicating high …
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Scaling Effects on Damage Development, Strength, and Stress-Rupture Life on Laminated Composites in Tension
The damage development and strength of ply-level scaled carbon/epoxy composite laminates having stacking sequence of [+Tn/-Tn/902n]s where constraint ply angle, T, was 0, 15, 30, 45, 60, and 75 degrees, and size was scaled as n=1,2,3, and 4, is reported in Part I. X-radiography was used to monitor …
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Interlaminar deformations on the cylindrical surface of a hole in laminated composites: an experimental study
Free-edge effects in composite laminates were studied experimentally. Strains were determined and compared on a ply-by-ply basis for the curved edges of a hole in thick composite panels and along the straight free-edge of the panels. The experimental technique of moire interferometry was extended …
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Two-dimensional to three-dimensional global/local finite element analysis of laminated composites in compression
… was developed, verified, and applied to a laminated composite plate of finite width and length containing a central circular hole. The resulting stress fields for axial compression loads were examined in detail for several symmetric stacking sequences and hole sizes. Verification was based …
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Random delamination of graphite/epoxy laminated composites : stress analysis, failure criteria, experimental characterization and stochastic modeling
The delamination failure of laminated composites exhibits two distinct characteristics; (1) the corresponding failure strengths display considerable scatter, and (2) the morphologies of the fracture surfaces and the interlaminar strengths are dependent on the magnitude of the fiber orientation …
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Design and fabrication of ceramic beads and laminated composites for the study of stress wave mitigation
… opportunities to design and fabricate beads and laminated composites in order to improve the material performance of engineering devices such as armors, casing for sensitive equipment, and heavy machinery. This thesis provides in detail the steps to formulate, test, and characterize the beads …
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Stress analysis of a rectangular implant in laminated composites using 2-D and 3-D finite elements
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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