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 20 for “"Laminate theory,"”.
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On a generalized laminate theory with application to bending, vibration, and delamination buckling in composite laminates
… model for accurate analysis of composite laminates and laminates with including delaminated interfaces is developed. An accurate prediction of stress distributions, including interlaminar stresses, is obtained by using the Generalized Laminate Plate Theory of Reddy in which layer-wise …
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Bolted flanged connections made of fiber reinforced plastic materials
… stainless steel or nickel alloys. Although the laminate theory has been used to establish design formulas for cylindrical and spherical shells, little work has been done to investigate bolted flanged connections. The ASME Boiler and Pressure Vessel Code or the codes of other industrialized …
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Modeling of laminated veneer lumber - A study of the material properties for thick structural elements
This thesis studies the material properties of laminated veneer lumber (LVL). LVL is a timber product made of thin veneers of wood, glued together to form a laminate. The work has been carried out with the aim of providing a better understanding of LVL when designing large structures, in particular …
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Structural Performance and Corrosion Resistance of Fiber Reinforced Polymer Wrapped Steel Reinforcing Bars
… is comprised of a bar analytical model using laminate theory, an in-depth analytical model for reinforced concrete sections, and a series of experimental tests to assess the structural performance and corrosion resistance of the composite bars. A comparison between the analytical model and …
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Nonlinear analysis of laminated composite shells using a micromechanics-based progressive damage model
… model for progressive failure analysis of laminated composite shell structures has been developed and implemented. The model couples a finite element model for nonlinear analysis of laminated shells with a micro mechanics elasticity solution for predicting failure and effective composite …
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Kinematics of Inter-Ply Interfaces In Composite Manufacturing
… Dynamic Mechanical Analysis (DMA) and Classical Laminate Theory (CLT). Cure cycle design with interrupted cure and interface modification with ZnO nanorods experiments are developed to reduce these processing- induced residual stresses and thereby increase laminate strength. The experimental …
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A combined experimental and stochastic finite element analysis methodology for the probabilistic fracture behavior of composite laminates
… the Strain Energy Release Rate (G) of composite laminates, is developed. Using this methodology, the probabilistic fracture analysis of laminated composites is performed. The material and geometric properties of the laminate are described in terms of homogeneous two-dimensional spatial stochastic …
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The effects of layer deposition angle and layer temperature on the orthotropic mechanical properties of 3D printed PLA parts
… isotropic, theoretical model based on classical laminate theory and the Tsai-Hill’s failure criteria at each temperature, and were implemented in a finite element model (FEM). The FEM captured the overall experimental tensile behavior of both the 100% infill and 40% linear infill cases.</p>
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Characterization of mechanical properties of fused deposition modeling manufactured polycarbonate composites
… part of the code which is based on the Classical Laminate Theory and is used to calculate the overall laminate properties depending on fiber orientation and raster pattern. The properties generated by this code are compared with the tested samples and are found to be in good agreement with each …
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Discrete Damage Mechanics Applied To Transverse Matrix Cracking
… reduction due to transverse matrix cracking in laminated composite structures is implemented as a user subroutine in Abaqus. The assumptions of the model are a symmetric laminate under in-plane loads and linear distribution of intralaminar shear stresses. The model was latter validated using 3D …
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Elastic properties and fracture behavior of graphite/polyimide composites at extreme temperatures
… fracture strengths of several Celion-6000/PMR-15 laminates was measured. Tests were run at -157,24 (room temperature), and 316°C (-250, 75, and 600°F). Both unnotched and notched laminates were tested. Several failure criteria, developed to predict the uniaxial fracture strength of epoxy …
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Finite element analysis of geodesically stiffened cylindrical composite shells using a layerwise theory
… shells are presented In this work. The layerwise laminate theory of Reddy (LWTR) is developed and adapted to circular cylindrical shells. The Ritz variational method is used to develop an analytical approach for studying the buckling of simply supported geodesically stiffened shells with discrete …
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The residual strength determination due to fatigue loading by fracture mechanics in notched composite materials
… the geometry of a circular hole of the deformed laminate was categorized as (1) uniformly expanded hole into elliptic shape, (2) crack propagation around the hole transversely. Both types were studied for 12 cases of layups with various proportions of 0, 45, -45 and 90 degree plies. The effect of …
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Three-dimensional layerwise modeling of layered media with boundary integral equations
… energy formulation and employing the layerwise laminate theory of Reddy. A one-dimensional finite element model is used for the analysis of the multi-layered system through its thickness, and integral Fourier transforms are used to obtain the exact solution for the in-plane problem. Explicit …
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Non-invasive characterization of bone tissue and modeling of bone at micron and sub-micron levels
… are made of lamellae. We propose using classical laminate theory, namely Sun & Li’s three dimensional laminate model to model bone at micron level. The outputs are compared with nanoindentation results, obtained from literature, and other theoretical models. Overall, our modeling results are in …
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Simulation approaches to support composite laminate analysis from early stage design
Composite laminates have enabled the creation of components that are lighter and stronger than their metallic equivalents, making them an enticing material for the development of novel components. However, the cost to build accurate and efficient structural analysis models of these components can …
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Finite element-based failure analysis of composite laminates with non-destructive feature quantification.
… failure based on an extension of the classical laminate theory and the Tsai-Wu failure criteria. The probability of failure is determined by Monte Carlo Simulation and compared to the Mean Value First Order Second Moment method (MVFOSM), followed by a validation through a Monte Carlo simulation …
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Mass transport in polymers
… by penetrant diffusion. A model based on the laminate theory was developed that accounts for the swelling and is able to predict the stress that raise in the material. The addition of inorganic fillers affects the transport properties of polymeric films. Mixed matrix membranes based on …
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Elastic properties of architectured cellular materials and biological materials (equine hoof wall)
… behavior in line with a classical elasticity theory. In contrast, the models with fixed unit cell sizes exhibited a softening behavior as the size decreased. The fourth study covers the analytical modeling of elastic properties of a horse hoof wall and comparison with existing experimental …