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.
Results
Showing 1 to 20 of 48 for “"Geometric nonlinearity"”.
-
A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
A two-dimensional finite-element computational procedure is developed for the accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian …
-
Geometric and material nonlinear analysis of laminated composite plates and shells
… a finite element model that accounts for both geometric nonlinearity and transverse shear stresses. The elasto-plastic material behavior is incorporated using the flow theory of plasticity. In particular, the modified version of Hill's initial yield criterion is used in which anisotropic …
-
Implications of P-Delta analysis and LRFD of gable frames
… specifications that incorporate second-order geometric effects. The use of second-order elastic analysis (SOEA) in the design of structural frameworks may lead to more economically designed structures and increased knowledge of structural stability. The research presented here concerns economy …
-
Numerical simulation of damage and progressive failures in composite laminates using the layerwise plate theory
… the experimental trends. Finally, the effect of geometric nonlinearity on the first-ply and ultimate failure loads of a composite laminate subjected to bending load is studied. The geometric nonlinearity is taken in to account in the von Kármán sense. It is demonstrated that the nonlinear failure …
-
Finite Opening of Propagating Shear Cracks
… by Knowles (1981) which included the effect of geometric nonlinearity, we show that there is indeed finite crack opening even for a pure shear crack when the crack propagates at a sub-Rayleigh wave speed, but the crack opening vanishes when the crack propagates at an intersonic velocity which is …
-
An Investigation of the Behavior of Structural Systems with Modeling Uncertainties
… the uncertainty associated with modeling geometric nonlinearities and Rayleigh damping models on the response of planar frames at multiple ground motion intensity levels. First, an investigation is presented on geometric nonlinearity approaches for planar frames, followed by a critical …
-
On a generalized laminate theory with application to bending, vibration, and delamination buckling in composite laminates
… composite plates for the linear theory. Geometrical nonlinearity, including buckling and post-buckling are included and used to perform stress analysis of laminated plates. A general two-dimensional theory of laminated cylindrical shells is also developed in this study. Geometrical …
-
Design and Evaluation of Geometric Nonlinearities using Joined-Wing SensorCraft Flight Test Article
… the configuration\'s potential for structural nonlinearity, the test article must exhibit equivalent structural flexibility and be designed to meet airworthiness standards. Previous work has demonstrated airworthiness through the successful flight of a Geometrically Scaled Remotely Piloted …
-
Vibration, buckling and postbuckling of laminated composites with delaminations
… theory is developed to formulate the problem. Geometric nonlinearity in the sense of von Karman and the imperfection in the plate in the form of initial global deflection and initial delamination openings are included. A simple contact algorithm which precludes the physically inadmissible …
-
Geometrically nonlinear analysis of composite laminates using a refined shear deformation shell theory
… and material anisotropy) shear deformation, and geometric nonlinearity on deflections and frequencies. Many of the numerical results presented here for laminated shells should serve as references for future investigations.
-
An incremental total Lagrangian formulation for general anisotropic shell-type structures
… transition element, are developed for the geometric nonlinear analysis of general shell-type structures, anisotropic as well as isotropic. Compatibility and completeness requirements are stressed in modelling the general shell-type structures in order to assure the convergence of the …
-
Performance-based seismic engineering of low and medium-rise steel frames
… effect of vertical component of ground motion, geometric nonlinearity, participation of nonstructural elements, and damping representation on the seismic response of steel frames is investigated. Based on the results of the dynamic nonlinear analyses, a simple procedure is proposed which uses …
-
Geometric and material nonlinear effects in elastic-plastic and failure analyses of anisotropic laminated structures
… elastic and plastic material behavior with full geometric nonlinearity is used to determine stresses at selected points (Gauss quadrature points in each element) of the structure. Material stiffness (constitutive) matrices are evaluated at each Gauss point, in each lamina and in each element, and …
-
Nonlinear mixed finite element analysis for contact problems by a penalty constraint technique
… the updated Lagrangian approach and accounts for geometric nonlinearity. In the mixed model, both displacements and stresses are approximated independently and this approach has in general been found to be more accurate than the displacement finite element model, especially for contact problems …
-
Transient analysis of layered composite plates accounting for transverse shear strains and von Karman strains
… shear deformation, rotatory inertia, and geometric nonlinearities. In this thesis, a theory to account for transverse shear deformation and rotatory inertia is combined with the von Karman theory of geometric nonlinearities to develop the nonlinear governing equations of laminated …
-
Stress Response of Tall and Heavy Electronic Components Subjected to Multi-axial Vibration
… of the assembly. This paper investigates the geometric nonlinearities and the resulting cross-axis interactions that tall and heavy electronic components experience when subjected to vibration excitation along two orthogonal axes – one direction is in the plane of the PWB and the other is …
-
Intentional nonlinearity in the design of dynamic micro/nanomechanical resonators via nanomaterial-integrated fabrication
… damping, these devices often exhibit significant nonlinearity, which results in limiting the operational range when they are intended to operate in a linear regime. However, nonlinear resonance, easily realized in a micro/nanomechanical system, also opens up a whole new window for the study of …
-
Finite element analysis of geodesically stiffened cylindrical composite shells using a layerwise theory
… shell laminate thickness, stiffener height, and geometric nonlinearity. Comparisons of the structural response of geodesically stiffened shells, axial and ring stiffened shells, and unstiffened shells are provided. In addition, interlaminar stress results near the stiffener intersection are …
-
Development of a Progressive Failure Finite Element Analysis For a Braided Composite Fuselage Frame
… shell finite element model of the frame included geometric nonlinearity and contact of the load platen of the testing machine with the frame. Intralaminar progressive failure is based on a maximum in-plane stress failure criterion followed by a moduli degradation scheme. Interlaminar progressive …
Page 1 of 3