Download or read book Data Collection on Geometry and Design Loads for Stiffened Cylindrical Shells in Marine Structures written by S. Valsg°ard and published by . This book was released on 1980 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bulletin on Stability Design of Cylindrical Shells written by and published by . This book was released on 1987 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studying Tailoring and Harnessing Structural Instability for Advanced Thin Walled and Architected Structures written by Mitansh Sharad Doshi and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spherical and cylindrical shells are extensively used in the field of aerospace, automotive and marine engineering. Typical shell structures under external pressure (Spherical shells) or under axial compression (Cylindrical shells) exhibit a buckling behavior. This buckling behavior is often characterized as nonlinear and hinders the load-carrying capacity of the shell structures. Imperfections in shell structures further reduce the load-carrying capacity of a structure. In this thesis, the first objective is to improve the buckling load of a near-spherical (icosahedron) composite shell structure. An icosahedron structure is selected as it is less sensitive to imperfections as compared to the spherical shells. To achieve a higher buckling load, geometry and material design variables of icosahedron shells are altered. For geometry design variables, different nodes are moved on the surface of the geometry, radius to thickness (R/T) ratio is varied, strip width is changed. For the material design variables, ply angle and rotation angle are changed for the different triangular faces of the icosahedron shell. Data-driven modeling is incorporated to eliminate the computationally expensive full-scale finite element analysis (FEA). Various loading curves are created based on the design variables with the help of a data-driven model and verified using the FEA simulations. The second objective of this thesis is to improve the buckling load characteristics of conventional cylindrical shells under axial compression using the metamaterial design approach. Metamaterials are engineered materials which exhibit tunable properties such as negative stiffness, bistability, and energy absorption. In this particular study, some typical (cuboid, cuboid braced, octet truss) and some new metamaterial (House Unit Cell (HUC) variants) unit cells are analyzed. Novel metamaterial-based cylindrical shells (cylindrical meta shells) are designed and analyzed under axial compressive loading. It is shown that cylindrical meta shells have a different post-buckling behavior as compared to their conventional counterpart. Though these meta shells have a low load-carrying capacity as compared to the similar scale conventional cylindrical shell, these meta shells are appropriate for the light load-carrying members in outer space. Additionally, various metamaterials-based cylindrical shells are compared based on the mass and loading parameters (structural efficiency plot). The final objective of this work is to harness the buckling force to create 3D structures from 2D precursors. There is a growing interest in using controlled buckling to create 3D mesostructures which can be used in microelectromechanical systems, energy storage and other reconfigurable morphing devices. The idea here is to apply compressive buckling to a 2D structure and create a 3D geometry based on the loading direction. In this objective, typical 2D structures (ribbon, box, pyramid and two-floor ribbon) are analyzed. The effects of initial wrinkling (mode imperfection) and misalignment on the final 3D structure are studied. Furthermore, in the two-floor design, it is demonstrated the possibility of obtaining different 3D shapes based on the loading path. This study shows that there are some 2D structures with consistent force-strain behavior based on the initial wrinkling and misalignment imperfections.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book University of Michigan Official Publication written by University of Michigan and published by UM Libraries. This book was released on 1988 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Each number is the catalogue of a specific school or college of the University.

Download or read book Comparison of Approaches for Determining the Failure of Stiffened Cylindrical Shells written by David Joseph Price and published by . This book was released on 2002 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thesis compares the analytical solution, two marine classification society design rules, and two design guides against experimental results for predicting the failure modes (general instability, axisymmetric buckling, and asymmetric collapse of the shell LOBAR BUCKLING) and failure pressures of ring-stiffened cylinders The analytical solution is first summarized based on several sources. The design rules for the classification societies and the design guidance from two sources are then presented with brief explanations for each one. The design rules used are: American Bureau of Shipping (Rules for Building and Classing Underwater Vehicles, Systems, and Hyperbaric Facilities, 1990) and Germanischer Lloyd (Rules for Underwater Technology, 1988). The design guides used were Society of Naval Architects and Marine Engineers (Submersible Vehicle Systems Design, 1990) and Massachusetts Institute of Technology Course 13A Professional Summer Notes (MIT 13A Submarine Design Trends, 2001). The United States Navy Naval Sea Systems Command, Submarine Structural Integrity Division supplied experimental data for four cylinders that covered the failure modes and allowed comparison between experiment and design rules/guidance. The comparison of experimental to predicted data found that the design codes and design guides performed adequately in predicting axisymmetric yield and asymmetric buckling. The performance of the design codes and guides in predicting failure by general instability was unsatisfactory. For the experimental failures by general instability, the design codes and guides predicted significantly higher failure pressures than those experimentally determined; resulting in the design codes and guides actually predicting failure by axisymmetric yield in stead of general instability. These inconsistencies in the predictions of failure mode and pressures for general instability should be further explored to determine causes and corrections.

Download or read book Design Aids for Stiffened Composite Shells with Cutouts written by Sarmila Sahoo and published by Springer. This book was released on 2018-06-23 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the free vibrations of graphite-epoxy laminated composite stiffened shells with cutout both in terms of the natural frequencies and mode shapes. The dynamic analysis of shell structures, which may have complex geometry and arbitrary loading and boundary conditions, is solved efficiently by the finite element method, even including cutouts in shells. The results may be readily used by practicing engineers dealing with stiffened composite shells with cutouts. Several shell forms viz. cylindrical shell, hypar shell, conoidal shell, spherical shell, saddle shell, hyperbolic paraboloidal shell and elliptic paraboloidal shell are considered in the book. The dynamic characteristics of stiffened composite shells with cutout are described in terms of the natural frequency and mode shapes. The size of the cutouts and their positions with respect to the shell centre are varied for different edge constraints of cross-ply and angle-ply laminated composite shells. The effects of these parametric variations on the fundamental frequencies and mode shapes are considered in detail. The information regarding the behavior of stiffened shells with cutouts for a wide spectrum of eccentricity and boundary conditions for cross ply and angle ply shells may be used as design aids for structural engineers. The book is a significant contribution to the existing literature from the point of view of both industrial importance and academic interest.

Download or read book Minimum Weight Design of Stiffened Cylindrical Shells Using Structural Synthesis written by Joseph Eugene Heckelbeck and published by . This book was released on 1972 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Role of Design Inspection and Redundancy in Marine Structural Reliability written by D. Faulkner and published by . This book was released on 1984 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Shell Structures Theory and Applications Vol 2 written by Wojciech Pietraszkiewicz and published by CRC Press. This book was released on 2009-09-22 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shell Structures. Theory and Applications, Volume 2 contains 77 contributions from over 17 countries, reflecting a wide spectrum of scientific and engineering problems of shell structures. The papers are divided into six broad groups: 1. General lectures; 2. Theoretical modeling; 3. Stability; 4. Dynamics; 5. Numerical analysis; 6. Engineering

Download or read book Optimum Design of Submerged Cylindrical Shells Subjected to Dynamic Loadings written by R. B. Nelson and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a procedure for the optimum design of a submerged T-ring stiffened cylindrical shell subjected to a specified harmonic excitation and external pressure. Three different design objectives can be investigated: (1) minimum structural mass, (2) minimum structural response and (3) minimum of a linear combination of structural mass and structural response. The design variables are shell thickness, T-web depth and thickness, T-flange width and thickness, and (uniform) stiffener spacing. The design constraints are on geometric admissibility, in vacuo natural frequencies of the shell, shell buckling, and on internal stresses. Numerical studies indicate the necessity of constraining the structural mass of the cylinder if minimum structural response is the design objective, and constraints must be imposed on both structural response and maximum structural mass when the combined design objective is employed.

Download or read book Progress in the Analysis and Design of Marine Structures written by Carlos Guedes Soares and published by CRC Press. This book was released on 2017-04-28 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in the Analysis and Design of Marine Structures collects the contributions presented at MARSTRUCT 2017, the 6th International Conference on Marine Structures (Lisbon, Portugal, 8-10 May 2017). The MARSTRUCT series of Conferences started in Glasgow, UK in 2007, the second event of the series having taken place in Lisbon, Portugal in March 2009, the third in Hamburg, Germany in March 2011, the fourth in Espoo, Finland in March 2013, and the fifth in Southampton, UK in March 2015. This Conference series deals with Ship and Offshore Structures, addressing topics in the areas of: - Methods and Tools for Loads and Load Effects - Methods and Tools for Strength Assessment - Experimental Analysis of Structures - Materials and Fabrication of Structures - Methods and Tools for Structural Design and Optimisation, and - Structural Reliability, Safety and Environmental Protection Progress in the Analysis and Design of Marine Structures is essential reading for academics, engineers and all professionals involved in the design of marine and offshore structures.

Download or read book On the Strength of Welded Ring Stiffened Cylindrical Shells Primarily Subjected to Axial Compression written by J. Odland and published by . This book was released on 1981 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comparison of Analytical and Numerical Approaches for Determining Failure of Ring stiffened Cylindrical Shells written by Michael W. Temme and published by . This book was released on 2003 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Minimum Weight Design of Stiffened Circular Cylindrical Shells Subject to Destabilizing Load written by George J. Simitses and published by . This book was released on 1975 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains a technical procedure by which one may design a fuselage type stiffened thin curcular cylindrical shell to carry safely a specified destabilizing load (uniform axial compression, uniform pressure, and torsion) individually applied.

Download or read book Petroleum Abstracts Literature and Patents written by and published by . This book was released on 1990 with total page 1416 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stiffened Plates written by M. S. Troitsky and published by . This book was released on 1976 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: