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Photoelasticity for Designers covers the fundamental principles and techniques of photoelasticity, with an emphasis on its value as an aid to engineering design. This book is divided into 12 chapters, and begins with an introduction to the essential optical effects necessary for an understanding of the photoelastic phenomena. The next chapters describe the concept and features of polariscopes; the characterization of photoelastic materials; the formulation and testing of two-dimensional models of photoelasticity; and the application of model stresses to prototypes for the analysis of stresses occurring in the plane of the model, effectively of uniform thickness. These topics are followed by a discussion of the frozen stress technique and a comparison of the various materials that can be used for models in the technique. The ending chapters deal with the principles and application of the birefringent coating and distorted model techniques. This book will prove useful to photoelasticians, design engineers, and students.
Photoelasticity as an experimental method for analyzing stress fields in mechanics was developed in the early thirties by the pioneering works of Mesnager in France and Coker and Filon in England. Almost concurrently, Föppl, Mesmer, and Oppel in Germany contributed significantly to what turned out to be an amazing development. Indeed, in the fifties and sixties a tremendous number of scientific papers and monographs appeared, all over the world, dealing with various aspects of the method and its applications in experimental stress analysis. All of these contributions were based on the so-called Neumann-Maxwell stress-opticallaw; they were developed by means of the classical methods of vector analysis and analytic geometry, using the conventionallight-vector concept. This way of treating problems of mechanics by photoelasticity indicated many shortcomings and drawbacks of this classical method, especially when three-dimensional problems of elasticity had to be treated and when complicated load and geometry situations existed. Meanwhile, the idea of using the Poincare sphere for representing any polarization profile in photoelastic applications was introduced by Robert in France and Aben in the USSR, in order to deal with problems of polarization oflight passing through aseries of optical elements (retarders andjor rotators). Although the Poincare-sphere presentation of any polarization profile con stitutes a powerful and elegant method, it exhibits the difficulty of requiring manipulations in three-dimensional space, on the surface of the unit sphere. However, other graphical methods have been developed to bypass this difficulty.
In recent years, the field of digital photoelasticity has begun to stabilise. Developments in Photoelasticity presents, in one volume, the time-tested advancements that have brought about a fundamental change in employing photoelastic analysis to solve diverse applications. Based on decades of active research, this authoritative treatment surveys wide-ranging connections in the field, focusing on developments made since 2010. Wide-ranging in its application, this high-level reference text is an invaluable tool for stress analysts, teachers of photo-mechanics and industry practitioners involved in stress analysis, solid mechanics, fracture mechanics, glass stress analysis, and contact mechanics. It also serves as a link between active research and teaching at graduate and senior undergraduate level. Key Features: Establishes the basics of photoelasticity with clarity to serve as a primary reference for users of the methodology Explains phase-shifting methods that are robust enough to allow the reader to implement them with ease. Explores modern methods based on colour information processing using a single isochromatic image as well as use of conventional polariscopes for complete photoelastic analysis. Provides carrier fringe analysis tools for quantifying low stress field information for special applications. Extensive information on a variety of applications of photoelasticity covering domains ranging from biomedical to aerospace to civil engineering applications. Highlights large scale photoelastic studies in granular materials with applications in plant biology, neurobiology and biomimetics
Vol. 7, no.7, July 1924, contains papers prepared by Canadian engineers for the first World power conference, July, 1924.