This brief provides guidance for the application of cohesive models to determine damage and fracture in materials and structural components. This can be done for configurations with or without a pre-existing crack. Although the brief addresses structural behaviour, the methods described herein may also be applied to any deformation induced material damage and failure, e.g. those occurring during manufacturing processes. The methods described are applicable to the behaviour of ductile metallic materials and structural components made thereof. Hints are also given for applying the cohesive model to other materials.

H. Yoshida, T. Ichikawa Electron Spin Echo Studies of Free Radicals in Irridated Polymers M. Ogasawara Application of Pulse Radiolysis to the Study of Polymers and Polymerizations I. Kaetsu Radiation Synthesis of Polymeric Materials for Biomedical and Biochemical Applications S. Tagawa Radiation Effects of Ion Beams on Polymers H.Yamaoka Polymer Materials for Fusion Reactors

With contributions by: R.H. Boyd; B.G. Sumpter, D.W. Noid, G.L. Liang, B. Wunderlich; M.D. Ediger, D.B. Adolf; R.-J. Roe; I. Bahar, B. Erman, L. Monnerie; A.A. Gusev, F. Muller-Plathe, W.F. van Gunsteren, U.W. Suter; L.R. Dodd, D.N. Theodorou; E. Leontidis, J.J. de Pablo, M. Laso, U.W. Suter; K.S. Schweizer."

1. R.C. Mehrotra, Jaipur, India Present Status and Future Potential of the Sol-Gel Process 2. J. Fricke, A. Emmerling, Wuerzburg, FRG Aerogels - Preparation, Properties, Applications 3. S. Sakka, T. Yoko, Kyoto, Japan Sol-Gel-Derived Coating Films and Applications 4. H. Schmidt, Saarbruecken, FRG Thin Films, the Chemical Processing up to Gelation 5. M. Henry, J.P. Jolivet, J. Livage, Paris, France Aqueous Chemistry of Metal Cations: Hydrolysis, Condensation and Complexation 6. R. Reisfeld, Jerusalem, Israel, C.K. Joergensen, Geneva, Switzerland Optical Properties of Colorants or Luminescent Species in Sol-Gel Glasses

This conference offers the opportunity to cover all plastic working operations from primary processes such as rolling, extrusion and drawing to secondary processes such as sheet metal forming, forging, roll forming, stretch forming, spinning, and flow turning. This "horizontal" organization of the conference is overlaid by the "vertical" organization which covers fundamentals such as material science, theory of plasticity, tribology as common scientific and technical disciplines and, furthermore, the role of computers, e.g. in process modelling, process control, process simulation, CAD/CAM/CIM/CAE etc., as well as tools and, machine tools including flexible manufacturing cells and systems.

Laser-Assisted Microtechnology introduces the principles and techniques of laser-assisted microtechnology with emphasis on micromachining of thin films, microprocessing of materials, maskless laser micropatterning and laser-assisted synthesis of thin-film systems. The experimental and theoretical physico-chemical basis of every technological process is presented in detail. On the basis of some characteristic examples of applications, the capabilities of the technological methods as well as the optimum conditions for their realization are discussed. In this second edition, besides the actualization of the literature, a new chapter concerning the laser-assisted wet chemical micro etching, has been added. This is a new method for direct 3D-micro structuring of solids, with a number of potential applications.

Simply to say that this is a collection of essays in honor of the late Wolfgang Yourgrau (1908-1979) is to explain, at least for-the obviously many-"insiders," the unusually wide-ranging title of the present volume. In a Foreword to the Proceedings of the First International Colloquium (focusing on logic, physical reality, and history), held at the University of Denver in May of 1966 under their leadership, Wolfgang Y ourgrau and Allen Breck wrote, in an oblique reference to C. P. Snow: "Indeed there are not two or three or four cultures: there is only one culture; our generation has lost its awareness of this . . . . Historians, logicians, physicists-all are banded in one common enterprise, namely in their des ire to weave an enlightened fabric of human knowledge. " Augment, if you will, the foregoing categories of scholars with biologists, philos ophers, cosmologists, and theologians-all of whom, in addition to historians, Wolf gang Yourgrau, by dint of his inextinguishable enthusiasm and charismatic qualities, assembled in Denver for the Second and Third International Colloquia (in 1967 and 1974, respectively)-and a few other besides, and one arrives at a statement of the credo wh ich Y ourgrau not only professed, but consistently exemplified throughout his adult life."

Helium Ion Microscopy: Principles and Applications describes the theory and discusses the practical details of why scanning microscopes using beams of light ions - such as the Helium Ion Microscope (HIM) - are destined to become the imaging tools of choice for the 21st century. Topics covered include the principles, operation, and performance of the Gaseous Field Ion Source (GFIS), and a comparison of the optics of ion and electron beam microscopes including their operating conditions, resolution, and signal-to-noise performance. The physical principles of Ion-Induced Secondary Electron (iSE) generation by ions are discussed, and an extensive database of iSE yields for many elements and compounds as a function of incident ion species and its energy is included. Beam damage and charging are frequently outcomes of ion beam irradiation, and techniques to minimize such problems are presented. In addition to imaging, ions beams can be used for the controlled deposition, or removal, of selected materials with nanometer precision. The techniques and conditions required for nanofabrication are discussed and demonstrated. Finally, the problem of performing chemical microanalysis with ion beams is considered. Low energy ions cannot generate X-ray emissions, so alternative techniques such as Rutherford Backscatter Imaging (RBI) or Secondary Ion Mass Spectrometry (SIMS) are examined.

A comprehensive presentation of the complete spectrum of methods for CVD-diamond deposition and an overview of the most important applications.

Recent developments in engineering and technology have brought about serious and enlarged demands for reliability, safety and economy in wide range of fields such as aeronautics, nuclear engineering, civil and structural engineering, automotive and production industry. This, in turn, has caused more interest in continuum damage mechanics and its engineering applications.

This book aims to give a concise overview of the current state of damage mechanics, and then to show the fascinating possibility of this promising branch of mechanics, and to provide researchers, engineers and graduate students with an intelligible and self-contained textbook.

The book consists of two parts and an appendix. Part I is concerned with the foundation of continuum damage mechanics. Basic concepts of material damage and the mechanical representation of damage state of various kinds are described in Chapters 1 and 2. In Chapters 3-5, irreversible thermodynamics, thermodynamic constitutive theory and its application to the modeling of the constitutive and the evolution equations of damaged materials are descried as a systematic basis for the subsequent development throughout the book.

Part II describes the application of the fundamental theories developed in Part I to typical damage and fracture problems encountered in various fields of the current engineering. Important engineering aspects of elastic-plastic or ductile damage, their damage mechanics modeling and their further refinement are first discussed in Chapter 6. Chapters 7 and 8 are concerned with the modeling of fatigue, creep, creep-fatigue and their engineering application. Damage mechanics modeling of complicated crack closure behavior in elastic-brittle and composite materials are discussed in Chapters 9 and 10. In Chapter 11, applicability of the local approach to fracture by means of damage mechanics and finite element method, and the ensuing mathematical and numerical problems are briefly discussed.

A proper understanding of the subject matter requires knowledge of tensor algebra and tensor calculus. At the end of this book, therefore, the foundations of tensor analysis are presented in the Appendix, especially for readers with insufficient mathematical background, but with keen interest in this exciting field of mechanics.

"

DEFECTS AND TRANSPORT IN OXIDES is the proceedings of the eighth Battelle Colloquium in the Materials Sciences, held in Columbus and Salt Fork, Ohio, September 17-22, 1973. It took as its theme the relationship between defects and transport of both mass and charge in oxides. Applications of defect-controlled transport to a number of important processes in oxides also were covered. In selecting this topic, the Organizing Committee thought that 1973 was timely to bring together the leading theoretical and experimental researchers in the oxide transport field to review its status in a critical way, and to consider current major research directions and how research in the future might be guided into fruitful areas. The meeting was highlighted by the presentation of several papers which suggest that major advances in our understanding of transport in oxides appear to be imminent. These papers dealt with the results of new theoretical approaches whereby the energies and configurations of defects may be calculated, and with new experimental techniques for indirectly observing these defects, previously thought to be below the limits of experimental resolving power. Other papers, dealing with the application of defect chemistry to technological processes, served to demonstrate the successes and to point out yet unresolved problems associated with ix x PREFACE understanding the chemistry of imperfect crystals.

Asphaltenes have traditionally been viewed as being extremely complex, thus very hard to characterize. In addition, certain fundamental properties of asphaltenes have pre viously been inaccessible to study by traditional macroscopic methods, further limiting understanding of asphaltenes. These limitations inhibited development of descriptions regarding the microscopic structure and solution dynamics of asphaltenes. However, a variety ofmore recent studies have implied that asphaltenes share many chemical properties with the smaller, more tractable components of crude oils. Recent measurements have indicated that asphaltene molecular weights are not as arge as previously thought, perhaps in the range of 600 to I 000 amu. In addition, new experimental methods applied to asphaltene chemical structures have been quite revealing, yielding a broad understanding. Conse quently, the ability to relate chemical structure with physical and chemical properties can be developed and extended to the understanding of important commercial properties of asphal tenes. This book treats significant new developments in the fundamentals and applications of asphaltenes. In the first section ofthe book, new experimental methods are described that characterize asphaltene structures from the molecular to colloidallength scale. The colloidal properties are understandable in terms of asphaltene chemical structures, especially with regard to the heteroatom impact on bonding. However, quantitative measurements of the of asphaltene self-association still need to be determined. In the second section of enthalpy this book, the fundamental understanding of asphaltenes is related riirectly to asphaltene utilization."

Among various branches of polymer physics an important position is occupied by that vast area, which deals with the thermal behav ior and thermal properties of polymers and which is normally called the thermal physics of polymers. Historically it began when the un usual thermo-mechanical behavior of natural rubber under stretch ing, which had been discovered by Gough at the very beginning of the last century, was studied 50 years later experimentally by Joule and theoretically by Lord Kelvin. This made it possible even at that time to distinguish polymers from other subjects of physical investigations. These investigation laid down the basic principles of solving the key problem of polymer physics - rubberlike elasticity - which was solved in the middle of our century by means of the statistical thermodynamics applied to chain molecules. At approx imately the same time it was demonstrated, by using the methods of solid state physics, that the low temperature dependence of heat capacity and thermal expansivity of linear polymers should fol low dependencies different from that characteristic of nonpolymeric solids. Finally, new ideas about the structure and morphology of polymers arised at the end of the 1950s stimulated the development of new thermal methods (differential scanning calorimetry, defor mation calorimetry), which have become very powerful instruments for studying the nature of various states of polymers and the struc tural heterogeneity."

In this introductory chemical physics textbook, the authors discuss the interactions, bonding, electron density, and experimental techniques of free molecules, and apply spectroscopic methods to determine molecular parameters, dynamics, and chemical reactions.

I express my sincere gratitude to NATO Science Committee for granting me the financial award to organize and direct the Advanced Research Workshop on "MULTILAYERED and FIBRE-REINFORCED COMPOSITES: PROBLEMS AND PROSPECTS" that was held in Kiev, Ukraine, during the period of June 2 - 6, 1997, in collaboration with Professor S. A. Firstov of the Frantsevich Institute for Problems of Materials Science, National Academy of Sciences, Kiev, Ukraine. In this context I wish to convey special thanks to Dr. J. A. Raussell-Colom, NATO Programme Director for Priority Area on High Technology, for his kind efforts and continuous guidance in the course of organizing the Workshop. I appreciate sincerely the opportunity of working closely with Professor Firstov and acknowledge with deep gratitude his outstanding contribution in co-directing the Workshop. I wish to express my special thanks to Dr. N. Orlovskaya of the Frantsevich Institute, for her outstanding contribution towards both the organization and conduct of the Workshop. I wish to convey my sincere thanks to Professor V. V. Skorohord, Deputy Director of the Frantsevich Institute, on behalf of the same Institute, for hosting the Workshop and welcoming the participants to l{iev. The very kind efforts of the members of the Scientific Advisory Committee, the Local Organizing Committee and the Staff of the Frantsevich Institute towards the organization and conduct of the Workshop, are gratefully appreciated. I convey my full indebtedness to all researchers who participated in the Workshop."

This and its companion Volume 2 chronicle the proceedings of the First Technical Conference on Polyimides: Synthesis, Char acterization and Applications held under the auspices of the Mid Hudson Section of the Society of Plastics Engineers at Ellenville, New York, November 10-12, 1982. In the last decade or so there has been an accelerated interest in the use of polyimides for a variety of applications in a number of widely differing technologies. The applications of polyimides range from aerospace to microelectronics to medical field, and this is attributed to the fact that polyimides offer certain desirable traits, inter alia, high temperature stability. Polyimides are used as organic insulators, as adhesives, as coat ings, in composites, just to name a few of their uses. Even a casual search of the literature will underscore the importance of this class of materials and the high tempo of R&D activity taking place in the area of polyimides. So it was deemed that a conference on polyimides was both timely and needed. This conference was designed to provide a forum for discussion of various ramifications of polyimides, to bring together scientists and technologists interested in all aspects of polyimides and thus to provide an opportunity for cross-pollination of ideas, and to highlight areas which needed further and intensi fied R&D efforts. If the comments from the attendees are a baro meter of the success of a conference, then this event was highly successful and fulfilled amply its stated objectives.

This book is designed for the chemist, formulator, student, teacher, forensic scientist, or others who wish to investigate the composition of polymeric materials. Theinformationwithinthesepagesisintendedtoarmthereaderwiththenecessary workingknowledgetoanalyze,characterize, anddeformulatematerials. ThestructureoftheContentsisintendedtoassistthereaderinquicklylocating the subject of interest and proceed to it with a minimum of expended time and effort. The Contents provides an outline of major topics and relevant materials char- terizedforthereader'sconvenience. Anintroductiontoanalysisanddeformulation is provided in Chapter 1 to acquaint the reader with analytical methods and their applications. Extensive references are provided as additional sources ofinfor- tion. All tables arelocatedin theAppendix, beginning onp. 235. GUIDE FOR USE This is a practical book structured to efficiently use the reader's time with a minimum effort of searching for entries and information by following these brief instructions: 1. Searchthe Contents and/orIndex fora subject withinthe text. 2. Analysis/deformulation principles are discussed at the outset to familiarize the reader with analysis methods and instruments; followed by formu- tions, materials, and analysis ofpaint, plastics, adhesives, and inks; and finally reformulation methods to test the results of analysis. 3. Materials and a wide assortment of formulations are discussed within the text by chapter/section number. 4. Materials are referred toby various names (trivial, trade, and scientific), and these are listed in tables and cross-referenced to aid the reader.

Cryogenics is an emerging technology filled with promises. Many cryogenic systems demand the use of nonmetallics and composites for adequate or increased performance. Thermal and electrical insulations, potting for superconducting magnets' mechanical sta bility, and composite structures appear to be some of the most significant applications. Research on nonmetallics at cryogenic temperatures has not progressed to the degree of research on metals. Nor can room temperature research be extrapolated to low tempera tures; most polymers undergo a phase transformation to the glassy state below room temperature. Research by producers, for the most part, has not been prac tical, because, except for LNG applications, the market for large material sales is not imminent. There are, however, many government stimulated developmental programs. Research on nonmetallics thus is dictated by development project needs, which require studies orien ted toward prototype hardware and specific objectives. As a result, research continuity suffers. Under these conditions, periodic topical conferences on this subject are needed. Industry and uni versity studies must be encouraged. Designers and project research material specialists need to exchange experiences and data. Low temperature-oriented research groups, such as the National Bureau of Standards and the Institute for Technical Physics - Karlsruhe, must contribute by assisting with fundamentals, interpreting proj ect data, and contributing to project programs through their materials research."

The transport requirements of the nuclear industry are unique in many respects. Thi s is not because cargoes are particularly large or hazardous by compari son wi th other industries but because standards of performance required in every aspect of the activity are so much greater than those required for any other industry. Transport of nuclear materials is subject to existing statutory regulations applied not only nationally but internationally. In addition to this, users of transport demand the highest standards of performance for their own purposes particularly in the area of quality assurance. Similar considerations also apply to the transport of non-nuclear materials where the transport link often has to tie in with project management and quality assurance requirements. Safety and security of nuclear materials are of paramount importance but even when these aspects are of a completely acceptable standard public attitudes to the transport activities have to be addressed adequately. The transport system itself consists of many components. The route, the vehicles, the containers, and the individual packages. The performance of each component determines the performance of the total system: all these factors were presented in the 1988 Conference on Transportation for the Nuclear Industry, giving a broad over-view of current practice together with wide ranging consideration of future requirements and developments.

The papers collected in this book were presented to the second and third annual confer ences on the metallography, physical chemistry, and physics of superconductors which took place in May of 1965 and 1966. These annual conferences, held at the A. A. Baikov Institute of Metallurgy of the Academy of Sciences of the USSR, have quickly become part of the scientific life of the country, and are already a tradition. More than thirty papers were read at each con ference, and between 250 and 300 representatives of a large number of organizations were pre sent at each conference. There was a distinguished array of scientific organizations taking part in the work of these conferences, which discussed current problems in the structure (constitution) and pro perties of superconductors, and ways of improving their characteristics so as to ensure the successful use of these materials in various new fields of technology. In the period which has passed since the first conference (May 1964), scientific research into superconducting systems and compounds has undergone substantial further development. A number of diagrams relating the composition to the superconducting properties have been studiedj new superconducting alloys have been developed together with methods of processing them and making them into various objects. The phase diagrams of the most promising super conducting systems (Nb-Sn, V-Ga, Nb-Zr, and Nb-Ti) have been investigated moreprecisely.

Biomaterials: From Molecules to Engineered Tissue gives examples of the application areas of biomaterials involving molecules at one end of the spectrum and finished devices in the other. It covers molecular approaches as well as molecules functional in preparing and modifying biomaterials, medical devices and systems, tissue engineering and artificial organs. Chapters on biomedical informatics and ethics complement the design and production aspects with their contribution in informatics and ethical concerns of biomedical research. This is a reference book for the advanced graduate student eager to learn the biomaterials area and for all researchers working in medicine, pharmacy, engineering and basic sciences in universities, hospitals, and industry involved in biomaterials and biomedical device production.

This book contains nineteen of the twenty papers which were pre sented at the conference on "Heterogeneous Kinetics at Elevated Tem peratures" held on September 8, 9 and 10, 1969 at the University of Pennsylvania. The papers are concerned primarily with the kinetics of inter facial reactions between the gaseous phase and a condensed phase and include pertinent topics in microscopic and macroscopic trans~ port phenomena. Several of the more recent advances in experimen tal techniques are covered, since progress in the interpretation of kinetic phenomena seems to be intimately connected with advances in experimental method. The discussion after each paper, as well as the general discussion at the end of the meeting, have been included in a strictly edited version; the philosophy being to include only those topics and questions which were not dealt with in the final versions of the manuscripts. The Chairmen (editors) would like to express their thanks to Professor C. B. Alcock for vigorously leading the final discussion period and for his entertaining after-dinner remarks on the evening of the conference banquet. The Chairmen would also like to place on record their indeptedness to Dr. D. R. Gaskell who, with the assistance of Mr. P. C. Shumaker, was largely responsible for the efficient technical arrangements of the meeting; to Dr. P. Entner and the willing group of graduate students for recording the dis cussions and for other organizational assistance; to Miss L.

In this book, the fundamentals of magnetism are treated, starting at an introductory level. The origin of magnetic moments, the response to an applied magnetic field, and the various interactions giving rise to different types of magnetic ordering in solids are presented and many examples are given. Crystalline-electric-field effects are treated at a level that is sufficient to provide the basic knowledge necessary in understanding the properties of materials in which these effects play a role. Itinerant-electron magnetism is presented on a similar basis. Particular attention has been given to magnetocrystalline magnetic anisotropy and the magnetocaloric effect. Also, the usual techniques for magnetic measurements are presented. About half of the book is devoted to magnetic materials and the properties that make them suitable for numerous applications. The state of the art is presented of permanent magnets, high-density recording materials, soft-magnetic materials, Invar alloys and magnetostrictive materials. Many references are given.

In our earlier monograph "Mlcrohardness of Metals" [1], published in 1962, we attempted to correlate a variety of investigations scattered throughout a number of journals with the gen- eral theme of solving problems of physicochemical analysis and metallography by microhard- ness measurements. The publication of "Microhardness of Metals" promoted the widespread use of this tech- nique in studying physicochemical phenomena in various materials. In recent years the micro- hardness method has been used most extensively in studying semiconducting materials, and this has necessitated the revision of the monograph with the aim of incorporating new experi- mental data relating to both metals and semiconductors. The greater proportion of the material presented in this book reflects the authors' own investigations. other investtgations associated with the use of the microhardness method in tOO physicochemical analysis of metallic and semiconducting systems are also taken into account. The authors are extremely indebted to Academician G. G. Urazov for his great interest in this work at its inception and for a number of valuable comments regarding the possibility of using the microhardness technique in physicochemical analysis. Sincere thanks are extended to Academician A. A. Bochvar and Professors A. N. Krestov- nikov, M. M. Khrushchov, M. V. Mal'tsev, M. V. Zakharov, and I. I. Novikov for their interest in these investigations.