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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 407 for “"Laminates"”.
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Phase selective flame-retardant laminates
… to enhance the fire performance of polymer laminates through structural optimisation and material innovation. The first approach involves applying external protective coatings to carbon fibre-reinforced polymer (CFRP) laminates using three configurations: cellulose nanofibres CNF/clay …
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High modulus carbon fiber/titanium laminates
… low weight materials in the form of composite laminates. In this investigation, laminates were fabricated using inorganic matrix/high modulus carbon fiber composites with titanium sheets. Laminates were tested in three-point bending to assess the performance of the upgrade. The results show …
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Interlaminar fatigue of fiber-reinforced laminates.
Thesis: M.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1971
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Edge caps for reinforcing composite laminates
… of an experimental program are presented. Cappad laminates are shown to be on average 130% to 140%. stronger than uncapped laminates when subjected to static tensile or tension-tension fatigue loading. In addition, the coefficient of variation of the static tensile failure load decreases from 24% …
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Compression failure of angle-ply laminates
… mechanisms of failure in compression of angleply laminates. Experimental results were obtained from 42 angle-ply IM7/8551-7a specimens with a lay-up of [ (±9) / (=F9)] 6s where 9, the off-axis angle, ranged from 0° to 90°. The results showed four failure modes, these modes being a function of …
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Long term behavior of Arall laminates
The behavior of ARALL (ARamid ALuminum Laminates) subjected to tension-tension cyclic loading was experimentally investigated as a first step towards the understanding of the fatigue damage mechanisms in Arall laminates, and the relationships between damage and stiffness change, remaining strength …
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Process-Induced Viscoelastic Stress in Composite Laminates
… 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 caused by …
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Adhesive properties of thermoset fibre metal laminates
Fibre metal laminates (FMLs) are composite materials that consist of layers of metal and fibre reinforced polymers. FMLs are used in the construction of aircraft fuselage skins, such as the Airbus A380. GLARE, the only commercially available FML, is of particular interest due to its damage …
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Fatigue damage in titanium graphite hybrid laminates
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Fatigue response of notched graphite--epoxy laminates
… of notched quasi-isotropic graphite-epoxy laminates were recorded and related to the fatigue damage. Two different laminates [0,90,+45,-45]s (type A) and [ +45, 90, -45, 0] s (type B) were considered and the effects of stacking sequence were compared. Nondestructive testing techniques such …
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SMA-Induced Deformations In general Unsymmetric Laminates
General unsymmetric laminates exhibit large natural curvatures at room temperature. Additionally, inherent to most unsymmetric laminates is the presence of two stable configurations. Multiple configurations and stability issues arise because of the geometric nonlinearities associated with the large …
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Analysis of Composite Laminates with Matrix Cracks
… 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 degradation of …
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Analysis of Tow-Placed, Variable-Stiffness Laminates
… considered in the analysis of variable-stiffness laminates was limits on fiber curvature which proved to be more restrictive for parallel fiber laminae than for shifted fiber. The in-plane responses of shifted and parallel fiber variable-stiffness laminates to either an applied uniform end …
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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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Delamination initiation in postbuckled dropped-ply laminates
The compression strength of dropped-ply, graphite-epoxy laminated plates for the delamination mode of failure is studied by analysis and corroborated with experiments. The nonlinear response of the test specimens is modeled by a geometrically nonlinear finite element analysis. The methodology for …
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Strength in notched and impact damaged laminates
The strength of notched and impact damaged laminates was studied. The solution for a plate containing an elliptic opening and inclusion was used as given by Lekhnitskii. The solution for the infinite plate, combined with laminate analysis to determine the ply stresses, and the average stress …
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Characterization of Bistability Behavior in Unsymmetric CFRP Laminates
<p>Composite laminates of unsymmetric layup families often exhibit twin stable shapes at room temperature, a phenomenon known as bistability. Unsymmetric bistable composite laminates have often been suggested for applications in aerospace morphing structures, damping, and energy storage, because of …
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Nonlinear Analysis of Unsymmetric Laminates under Cylindrical Bending
… analysis of unsymmetric composite long, narrow laminates under cylindrical bending is studied. The nonlinear governing equations are obtained to analyze the cylindrical bending of arbitrary laminates. The <em>von-Karman</em> type geometrical nonlinearity is incorporated in the governing …
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Analysis of shear test methods for composite laminates
… specimen is studied for three graphite-epoxy laminates ([0], [90], [±45]<sub>S</sub>); the cross beam is studied for two graphite-epoxy laminates ([0/90]<sub>S</sub>, [±45]<sub>S</sub>); the Iosipescu and rail shear specimens are studied with several materials (steel, graphite-epoxy, and …
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Large strain flexural testing of thin composite laminates
… 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. While the initiative to utilize composite laminates in deployable …
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