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Showing 1 to 20 of 69 for “"Cross-ply"”.
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SMA-induced deformations in unsymmetric cross-ply laminates
… SMA-induced deformations in an unsymmetric cross ply laminate. A previously developed theory is used to predict the room-temperature shape of the cross-ply laminate by minimizing its total potential energy. Then, using the principle of virtual work, equations relating the shape of the …
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Finite element analysis of damaged cross-ply composite laminates
… of transverse 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 …
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Nonlinear Vibrations of Doubly Curved Cross-PLy Shallow Shells
… of isotropic single-layered and multi-layered cross-ply doubly curved shallow shells with simply supported boundary conditions. The study is based-on the full nonlinear partial-differential equations of motion for shells. These equations of motion are based-on the von K\'{a}rm\'{a}n-type …
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Tensile behavior of unidirectional and cross-ply ceramic matrix composites
… with Nicalon fibers. Both had a symmetric cross-ply layup. Initial observations of the composites showed significant porosity and some cracking in the Blackglas™ samples. The GCMC samples showed considerably less damage. From the observed tensile behavior of the cross-ply composites, a …
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Investigation of Microcracking and Damage Propagation in Cross-Ply Composite Laminates
The present study investigates microcracking and damage progression in IM7/977-2, IM7/5555, and IM7/5276-1 [0/90/90/0] laminates. For each material system, seven to eight small coupons were axially loaded in a tensile substage. At increments of around 50 MPa the surfaces of the specimens were …
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Elastic and time dependent matrix cracking in cross-ply composite laminates
… of time and stress level were investigated in cross-ply laminates to gain more understanding on the damage events in composites. Analytical predictions of the effect of stress level were performed for the case of linear elastic materials. The predictions were based on energy methods and linear …
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Characterization of local strain fields in cross-ply composites under transverse loading
The student, Ariel Wilhelmsen, accepted the attached license on 2015-06-17 at 11:38.
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Investigation of Surface Displacements Induced in Loaded Cross-Ply Composite Laminates with Microcracking
… element models are created for eleven different cross-ply IM7/977-2 laminates with ply numbers varying from four to ten. Here, each ply thickness is 0.127mm, which is the common laminate thickness commercially available for this material system. For each model a range of transverse loadings are …
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Stresses and deformations in cross-ply composite tubes subjected to circumferential temperature gradients
The stresses and deformations in cross-ply composite tubes subjected in circumferential temperature gradients are studied. The motivation behind the study is the anticipated use of composite tubes in space structures where the tube is exposed to the heat of the sun on one side and the cryogenic …
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Thermally Induced Vibration of a Cross-Ply Laminated Plate with Hygrothermal Effects (Exact Solution)
… moisture diffusion on one surface of a symmetric cross-ply plate made of AS/3501 graphite epoxy with simply-supported boundary conditions.</p>
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Effect of fiber/Matrix Interphase on the Long Term Behavior of Cross-Ply Laminates
… O system has the lowest strength. The (0,90₃), cross-ply laminates from the three material systems exhibit different damage mechanisms and failure modes under monotonic tensile loading. Fatigue test results indicate that the 810 O laminates have longer fatigue lives at higher load levels and …
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Characteristics of thermally-induced transverse cracks in graphite-epoxy composite laminates
… transverse cracks in T300/5208 graphite-epoxy cross-ply and quasi-isotropic laminates were investigated both experimentally and analytically. The formation of transverse cracks and the subsequent crack spacing present during cooldown to -250°F (116K) and thermal cycling between 250 and -250°F …
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Resistance of Carbon Fibre Reinforced Composites to Quasi-static and Ballistic Perforation
… of carbon fibre reinforced plastic (CFRP) cross-ply laminates were investigated under quasi-static and ballistic loading. In this thesis, the two most prominent failure modes were indirect tension and shear plugging. To characterise the indirect tension mechanism, CFRP cross-ply coupons …
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Nonlinear temperature dependent failure analysis of finite width composite laminates
… including curing stresses is presented. Cross-ply, angle-ply, and some quasi-isotropic graphite/epoxy, laminates are studied. Curing stresses are calculated using temperature dependent elastic properties that are input as percent retention curves, and stresses due to mechanical loading in …
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Development of a Self-Heating Consolidation Procedure for 3D-Printed Continuous Wire Polymer Composite Laminates
… to reduce the voids in unidirectional and cross-ply 3D-printed CWPC laminates. The consolidation procedure used resistive heating combined with hot-pressing to reduce the internal voids. Image processing of sample cross sections proved the void content in consolidated samples were 91.6% …
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Deformations of In-plane Loaded Unsymmetrically Laminated Composite Plates
… semi-infinite unsymmetrically laminated cross- and angle-ply plates, a one-dimensional problem that can be solve in closed form and with ABAQUS by making the appropriate approximations for the infinite geometry. In this portion of the study it is found that semi-infinite cross-ply …
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New in-plane and interlaminar shear test methods for fiber reinforced composites
… test of the specimen was performed on a cross-ply laminate. High sensitivity moire interferometry was used to determine the shear and normal strains on the entire face of the specimen. The results of the test were compared to those of the Iosipescu specimen on the same material. The …
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Nonlinear Forced Vibration of an Unsymmetrically Laminated Composite Beam
… Two cases are considered: unsymmetrical angle-ply and unsymmetrical cross-ply composite beams. The nonlinear governing partial differential equations of motion are obtained by taking into account the von-Karman geometrical nonlinearity. These equations are transformed into nonlinear ODE …
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Geometrically nonlinear analysis of composite laminates using a refined shear deformation shell theory
… von Karman strains). Exact solutions for certain cross-ply shells and finite-element models of the theory are also developed. The finite-element model is based on independent approximations of the displacements and bending moments (i.e., mixed formulation), and therefore only C°-approximations are …
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Transverse microcracking in Celion 6000 graphite/PMR-15 polyimide composite
… load at which microcracking initiates and the ply residual stresses were predicted using laminate analysis with stress and temperature-dependent materials. The TVM density as a function of tensile load was predicted using the multiple cracking theory proposed by Garrett, Parvizi and Bailey. …
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