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Full Description
The current situation with regard to the use of high-performance composites is one of seeking a reliable means of characterizing the fundamental properties and/or behavior of composite materials. The employment of such materials in vi tal structural applications require criteria as part of the materials selection and design procedures. However, the principal limitation of the many currently available procedures, most of which were borrowed from the metal i"ndustry, is its intrinsic restriction to single phase materials. They cannot adequately ac count for the variations in the constituents or structure of the composite that can have a significant influence on its gross behavior. Although a considerable amount of research has been conducted in the past with the objective of under standing composite material behavior, for the most part, the research efforts tended to cover too wide a spectrum of problems with little penetration into the fundamental aspects. For this reason, the investigators in this field have long felt the need to bring together a small group of experts to review the fun damentals, discuss the problem areas, and display the current developments. The USA-USSR Sympo‾‾ on the f‾ct‾e 06 Compo‾‾e Mat‾ was organized for this purpose. There is the additional need to share this information with the new comers to the field as well as the oldtimers. This is accomplished by publish ing the symposium proceedings contained in the present volume. A Russian trans lation of the papers in this volume will also be made available.
Contents
Section I Microfracture.- Micro- and macrocracks in composites.- Dispersed fracture of unidirectional composites.- A concentration criterion for microcrack enlargement in heterogeneous materials.- Studies in fracture kinetics of composite materials.- Section II Statistical and Analytical Methods.- Verification and estimation of stochastic models of fracture.- Computer simulation of composite fracture process with bonding strength defects between components.- Failure analysis of composites with stress gradients.- Methods for predicting failure behavior of composite materials.- The interface crack in retrospect and prospect.- Section III Fracture Analysis.- Fracture mechanics of composite materials.- Interaction of cracks in fibrous media.- Observations of three dimensional geometric effects in crack growth and implications for composite material structures.- A delamination failure mode of composite bars in compression.- Analysis of cracks in composite structures subjected by thermal loading.- Multiple fracture of laminates.- Polymer reinforcement from the viewpoint of fracture mechanics.- The fracture of boron fiber reinforced 6061 aluminum alloy.- Section IV Failure Analysis.- Criteria of composite material strength.- Some problems of failure of thin-walled flexural structures from reinforced plastics.- Optimum design and strength of layered thin composites.- Fracture models of composites with different fiber orientation.- Peculiarities of organic fibers reinforced plastic failure and their influence on the strength.- Analysis of free edge Induced failure of composite laminates.- Fracture of compact bone tissue.- Prediction of fatigue lifetime of fiberglass plastics based on cumulative damage.- Section V Experimental Methods.- Methods and means for nondestructive studyof the damageability of composite materials.- Impetus of composite mechanics on test methods for fiber composites.- The nature of crack growth in composite materials.- Application of experimental methods to fracture of composites.- Carbon fiber surfaces - characterization, modification and effect on the fracture of high modulus fiber - polymer composites.- Some interesting mechanical behaviors of fiber composite materials.- The fracture characteristics and properties of pan graphite-aluminum composites.- Prediction of fracture initiation in composite structures.- List of Participants.
