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The book in hand presents advanced methods of brittle fracture and fatigue assessment. The Neuber concept of fictitious notch rounding is enhanced with regard to theory and application. The stress intensity factor concept for cracks is extended to pointed and rounded corner notches as well as to locally elastic-plastic material behaviour. The averaged strain energy density within a circular sector volume around the notch tip is shown to be suitable for strength-assessments. Finally, the various implications of cyclic plasticity on fatigue crack growth are explained with emphasis being laid on the DJ-integral approach.
This book continues the expositions of the authors well known reference work in German language Ermüdungsfestigkeit Grundlagen für Ingenieure (Fatigue strength fundamentals for engineers).
List of contents
Generalised Neuber Concept of Fictitious Notch Rounding.- Extended Stress Intensity Factor Concepts.- Local Strain Energy Density Concept.- Elastic-Plastic Fatigue Crack Growth.
About the author
Dieter Radaj, promoviert und habilitiert an der TU Braunschweig, war in Industrie, Wissenschaft und Lehre in unterschiedlichen Funktionen tätig. Seine Publikationen zur Festigkeitslehre und Technischen Mechanik sind weltweit anerkannt. Radaj ist zudem Autor eines Buches zu den buddhistischen Denktraditionen. Er lebt in Stuttgart.
Summary
In five chapters, this volume presents recent developments in fatigue assessment. In the first chapter, a generalized Neuber concept of fictitious notch rounding is presented where the microstructural support factors depend on the notch opening angle besides the loading mode. The second chapter specifies the notch stress factor including the strain energy density and J-integral concept while the SED approach is applied to common fillet welded joints and to thin-sheet lap welded joints in the third chapter. The forth chapter analyses elastic-plastic deformations in the near crack tip zone and discusses driving force parameters. The last chapter discusses thermomechanical fatigue, stress, and strain ranges.
