George J. Simitses

Bio: George J. Simitses is an academic researcher from Georgia Institute of Technology. The author has contributed to research in topics: Buckling & Torsion (mechanics). The author has an hindex of 24, co-authored 120 publications receiving 2279 citations. Previous affiliations of George J. Simitses include University of Cincinnati.

Effect of delamination of axially loaded homogeneous laminated plates

Abstract: A simple one-dimensional model has been developed and analyzed for predicting delamination buckling loads. The model is employed to predict critical loads for delaminated homogeneous plates with both simply supported and clamped ends. The effects of delamination position, size, and thickness on the critical loads are studied in detail for both sets of boundary conditions. The results reveal that for certain geometries the buckling load can serve as a measure of the load carrying capacity of the delaminated configuration. In other cases, the buckling load is very small and delamination growth is a strong possibility, depending on the toughness of the material.

Fundamentals of Structural Stability

Abstract: The ability of a structural assembly to carry loads and forces determines how stable it will be over time. Viewing structural assemblages as comprising columns, beams, arches, rings, and plates, this book will introduce the student to both a classical and advanced understanding of the mechanical behavior of such structural systems under load and how modeling the resulting strains can predict the overall future performance?the stability?of that structure. While covering traditional beam theory, the book is more focused on elastica theory in keeping with modern approaches. This text will be an expanded and updated version a similar, previously published book, but with pedagogical improvements and updated analytical methods. This engineering textbook will provide a focused treatment on the study of how structures behave and perform when under stress loading, including plastic deformation and buckling. All advanced engineering students studying engineering mechanics, structural analysis and design, fatigue and failure, and other related subjects need to have this knowledge, and this book will provide it in a thorough and coherent fashion. Written by two of the world?s leading engineering professors in this subject area, the pedagogy has been classroom-tested over many years and should find a receptive readership among both students and instructors.

Buckling and Postbuckling of Imperfect Cylindrical Shells: A Review

Abstract: Thin-walled cylinders of various constructions are widely used in simple or complex structural configurations. The round cylinder is commonly found in tubing and piping, and in offshore platforms. Depending on their use, these cylinders are subjected (in service) to individual and combined application of external loads. In resisting these loads the system is subject to buckling, a failure mode which is closely associated with the establishment of its load-carrying capacity. Therefore, the system buckling and postbuckling behavior have been the subject of many researchers and investigators both analytical and experimental. The paper is a state-of-the-art survey of the general area of buckling and postbuckling of thin-walled, geometrically imperfect, cylinders of various constructions, when subjected to destabilizing loads. The survey includes discussion of imperfection sensitivity and of the effect of various defects on the critical conditions.

Recent advances in analysis of laminated beams and plates. Part I - Sheareffects and buckling.

Abstract: A review of the recent developments in the analysis of laminated beams and plates with an emphasis on shear effects and buckling is presented. A discussion of various shear-deformation theories for plates and beams is given. The available theories are derived assuming a variation of either the in-plane displacement components or the stress components or both in the thickness coordinate. A review of the recently developed finite elements to analyze thin and thick laminated beams and plates is given next. These elements have been derived using the displacement methods, or the mixed methods or the hybrid methods. Recent studies on the buckling and postbuckling behavior of perfect and geometrically imperfect plates are described next. These behaviors have been studied using analytical, numerical, and experimental techniques. Finally, a review of the various studies on the delamination buckling and growth in beams and plates is given. Once again, the studies have been conducted using analytical, numerical, and experimental techniques. The energy release rates have been determined using closed-form solutions or using numerical differentiation. Mention also is made of studies on multiple delaminations and on dynamic response of composite laminates under impact loads.

The compromise decision support problem and the adaptive linear programming algorithm

Abstract: 1. Our Frame of Reference A COMPREHENSIVE approach called the decision support problem technique" is being developed and implemented at the University of Houston to provide support for human judgment in designing an artifact that can be manufactured and maintained. Decision support problems (DSPs) provide a means for modeling decisions encountered in design, manufacture, and maintenance. Multiple objectives that are quantified using analysis-based "hard" and insight-based "soft" information can be modeled in the DSPs. For real-world, practical systems, not all of the information will be available for modeling systems comprehensively and correctly in the early stages of the project. Therefore, the solution to the problem, even if it is obtained using optimization techniques, cannot be the optimum with respect to the real world. However, this solution can be used to support a designer's quest for a superior solution. In a computerassisted environment, this support is provided in the form of optimal solutions for decision support problems. Formulation and solution of DSPs provide a means for making the following types of decisions: