Download or read book Buckling and Postbuckling of Laminated Composite Plates with Ply Dropoffs written by Marc Thomas DiNardo and published by . This book was released on 1987 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and analytical investigation was conducted on the buckling and postbuckling behavior of laminated graphite/epoxy plates with ply dropoffs under uniaxial compression. Three types of plates were considered: ply dropoff plates with one or more internal plies terminated along a centerline perpendicular to the loading, flat plates to provide the baseline behavior, and angle change plates where the fiber angle of several plies changes abruptly along the centerline. This latter case isolates the change in material properties without the geometric eccentricities present in ply dropoff plates. An analysis method using a "superelement" formulated with a Rayleigh-Ritz assumed deflection model was developed and utilized to predict the linear buckling response of the plates. Both the experimental and analytical results show that ply dropoffs have a marked effect on plate buckling and postbuckling behavior. In contrast to basic flat plates, plates with ply dropoffs exhibit complex deflection shapes that cannot be characterized by simple modes. The buckling load of these plates was related to the ratio of the longitudinal bending stiffness of the dropped and undropped section of the plates and was bounded by the buckling loads of the flat plates with the layup configurations of the two individual sections. The angle change plates exhibited much of the same behavior seen in the ply dropoff plates but indicated that the change in the other bending stiffnesses can also have an important effect on the buckling behavior.
Download or read book Buckling and Postbuckling Behavior of Laminated Composite Plates with Ply Dropoffs written by Marc Thomas DiNardo and published by . This book was released on 1986 with total page 746 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling and Postbuckling of Composite Plates written by G.J. Turvey and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributed by leading authorities in the field from around the world, this text provides a comprehensive insight into buckling and postbuckling. Basic theory, methods of buckling analysis and their application, the effect of external variables such as temperature and humidity on the buckling response and buckling tests are all covered.
Download or read book Buckling of Laminated Composite Plates and Shell Panels written by Arthur W. Leissa and published by . This book was released on 1985 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling and Postbuckling Behavior of Laminated Composite Plates With a Cutout written by Michael P. Nemeth and published by . This book was released on 1996 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling and Postbuckling Analysis of Quasi isotropic Laminated Composite Plates with Different Centrally Located Cut outs written by Oscar Arias Elguezabal and published by . This book was released on 2005 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling of Laminated Composite Plates and Shell Panels written by Arthur W. Leissa and published by . This book was released on 1985 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling Postbuckling and Crippling of Materially Nonlinear Laminated Composite Plates written by Rocky Richard Arnold and published by . This book was released on 1983 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling and Postbuckling Response of Laminated Composite Plates with Interlaminar Flaws written by Nima Shabanijafroudi and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High stiffness and strength, corrosion resistance, and ease of manufacturing have made laminated composites an excellent replacement for isotropic materials. The outstanding properties of composites especially appeal to industries such as the aerospace industry where lightweighting is of great importance. Despite the mentioned advantages, susceptibility to defects is a major drawback in using these materials. Being composed of several layers bonded together using an adhesive material, delamination or debonding of layers is one of the most common flaws in composite laminates. Delamination may drastically impact the mechanical behavior of laminates, especially in unstable conditions. Larger deflections and higher levels of stresses that a laminate experiences in the postbuckling state may, in turn, lead to the growth of a delamination. Given the complications that are caused by delamination, keeping delaminated plates in service requires an in-depth understanding of their postbuckling behavior including the possibility of the growth of the delamination. The objective of this thesis is to develop a comprehensive mathematical and mechanical methodology for accurately predicting the buckling and postbuckling behavior of delaminated composite plates including the fracture mechanical phenomena involved in the postbuckling state. In all the formulations derived in the framework of the new methodology, the deformations of laminates are approximated using the first-order shear deformation theory and the equilibrium equations were derived using the principle of stationary total potential energy and the Ritz method. In both linear buckling and nonlinear postbuckling analyses, the effect of large rotations is incorporated by adopting Von Kármán's approximations of the Green strain tensor. The present thesis work approaches the buckling and postbuckling behavior of delaminated plates through nonlinear analyses. However, conducting nonlinear analyses requires a preliminary knowledge of the potential buckling modes (local, mixed or global) and the loading level at which they may emerge. This preliminary information is used for determining the optimal configuration of imperfections to be incorporated in the nonlinear analyses. In the present work, a novel eigenvalue buckling solution was developed for the required preliminary information. The developed formulation in order to account for the prebuckling stress field nonuniformity caused by in-plane constraints, bases the eigenvalue analysis on a calculated stress field obtained using a prebuckling stress analysis. For interrogating the details of the postbuckling behavior of delaminated plates, a state of the art postbuckling solution is proposed. The proposed methodology uses a new partitioning scheme that splits the delaminated plate using the plane of the delamination. Outside the delaminated regions the bond between the sublaminates is modeled using a penalty function method. The penalty functions model the effect of an extremely thin layer of elastic adhesive gluing the sublaminates together. The use of the penalty function method offers the advantage of providing the distribution of interlaminar traction in the plane of the delamination. Given the availability of interlaminar tractions in the vicinity of the borders of the delaminated region, Irwin's crack closure integrals were integrated into the solution for calculating strain energy release rates corresponding to the three fracture modes separately. Given the importance and the abundant industrial use of curved composite panels especially in the aerospace industries, in an attempt to extend the applicability of the developed methodology to delaminated curved panels, an eigenvalue buckling solution for curved plates subjected to rotational edge restraints is developed. The validity of the deliverable results of each of the pieces of the developed methodology was verified by comparing the results with experimental data and numerical results obtained using finite element analyses.
Download or read book Thermal Buckling and Postbuckling of Symmetrically Laminated Composite Plates written by Carol Ann Meyers and published by . This book was released on 1990 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Progressive Failure and Post buckling Response of Tapered Composite Plates written by Dai Ying Liu and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and manufacture of a variable-thickness composite laminate such as a helicopter yoke or a robot arm involves tapering the laminate by dropping certain individual plies at discrete internal locations, in order to tailor the stiffness of the laminate to the design and performance requirements. The ply drop in the laminate creates geometric and material discontinuities and results in large stress concentration. These in turn cause changes in the response and failure strengths of the laminate. For achieving economical, safe and reliable design, the progressive failure and post-buckling response of tapered laminated plates are important design considerations. Therefore, there is a necessity to investigate the progressive failure of tapered laminates and its effect on the post-buckling response. The present thesis concerns with these aspects. In the present thesis, a nonlinear finite element formulation is developed based on the first-order shear deformation theory and the geometric nonlinearity in the von Karman sense for the analysis of tapered laminated plates. The tensor polynomial form of failure criterion is used in conjunction with a progressive failure simulation methodology to study the progressive failure. The developed formulation and progressive failure simulation methodology are validated. A detailed parametric study of the deterministic progressive failure of tapered laminates under the action of uni-axial and bi-axial compression, in-plane positive shear, and in-plane negative shear loadings is conducted. A detailed parametric study on the deterministic progressive failure of tapered laminates under the action of bi-axial compression combined with in-plane shear loading is also conducted. The first-ply failure load, the ultimate failure load, the buckling load, the associated maximum transverse displacements, and the locations and modes of failure of tapered laminated plates are determined for each case. The effects of different taper and laminate configurations, fiber orientations, boundary conditions, addition of uniform-thickness sections are determined. Stochastic progressive failure of tapered laminated plate under the action of bi-axial compression combined with in-plane positive shear loading is investigated. The mean and standard deviation values of failure strengths are calculated considering the material properties as stochastic processes in space.
Download or read book Postbuckling Analysis of Laminated Composite Plates with Damage written by Andrzej Baranski and published by . This book was released on 1999 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling and Postbuckling of Laminated Composite Square Plates with Reinforced Central Circular Holes written by James Martin and published by . This book was released on 1972 with total page 926 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Collection of Technical Papers Structures and materials written by and published by . This book was released on 1987 with total page 898 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the Indian Structural Steel Conference 2020 Vol 1 written by Mahendrakumar Madhavan and published by Springer Nature. This book was released on 2023-08-16 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the select peer-reviewed proceedings of the Indian Structural Steel Conference (ISSC 2020). The topics cover state-of-the-art and state-of-the-practice in structural engineering, and latest research in structural modeling and design. Novel analytical, computational and experimental techniques, proposal of new structural systems, innovative methods for maintenance, rehabilitation, and monitoring of existing structures, and investigation of the properties of engineering materials as related to structural behavior are presented in the book. This book will be very useful for structural engineers, researchers, and consultants interested in sustainable materials and steel construction.
Download or read book Buckling of Laminated Composite Plates written by Rivka Gilat Cygeilman and published by . This book was released on 1988 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling Analysis of Woven Glass Epoxy Laminated Composite Plate written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There have been numerous studies on the composite laminated structures which find many applications in many engineering fields namely aerospace, biomedical, civil, marine and mechanical engineering because of their ease of handling, good mechanical properties and low fabrication cost. They also possess excellent damage tolerance and impact resistance. The mechanical behaviour of composite structures is of particular interest to engineers in modern technology. Buckling of plates is a well-established branch of research in composite structures stability. It has a wide range of applications in engineering science and technology. Buckling behaviour of laminated composite plates subjected to in-plane loads is an important consideration in the preliminary design of aircraft and launch vehicle components. The sizing of many structural subcomponents of these vehicles is often determined by stability constraints. Plates with circular holes and other openings are extensively used as structural members in aircraft design. The buckling behaviour of such plates has always received much attention by researchers. These holes can be access holes, holes for hardware to pass through, or in the case of fuselage, windows and doors. In some cases holes are used to reduce the weight of the structure. In aerospace and many other applications these structural components are also made up of composite material to further reduce the weight of the structure. The outstanding mechanical properties of composite structures, such as durability and corrosion-resistance characteristics combined with low density, make it more attractive compared to conventional materials. In this study, the influence of cut-out shape, length/thickness ratio, and ply orientation and aspect ratio on the buckling of woven glass epoxy laminated composite plate is examined experimentally. Clamped - ree -Clamped-free boundary condition is considered for all case. Experiments have been carried out on laminated composites wit.
