The Effect of Strain Rate on the Fracture Ductility of Some Metastable Steels PDF Download
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Author: Albert Ye-Ee Wu
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Author: Albert Ye-Ee Wu
Publisher:
ISBN:
Category :
Languages : en
Pages : 80
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Book Description
Author:
Publisher:
ISBN:
Category : Steel
Languages : en
Pages :
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Author: Sukanya Sharma
Publisher:
ISBN:
Category : Fracturemechanics
Languages : en
Pages : 14
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Book Description
Dual phase (DP) steels are being increasingly used as structural components in the automotive industry owing to their combination of high strength and moderate ductility.Formability and crash resistance are important mechanical properties that expose the steel to high strain rates.Fracture characteristics of a DP steel at strain rates spanning seven orders of magnitude are investigated using quantitative fractography.The DP steel investigated in this study is comprised of a continuous matrix of martensite with interspersed ferrite islands.The data reveal that the flow stress, uniform strain, and ductility are substantially higher at the higher strain rates.Quantitative fractography, employed to understand the fracture characteristics, shows an increase in the extent of ductile fracture at high strain rates.In this presentation, the results demonstrating high strain rates facilitating dimpled ductile fracture and/or increased resistance to faceted fracture are discussed.
Author: Matthieu Dunand
Publisher:
ISBN:
Category :
Languages : en
Pages : 236
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Author: Frank Pobell
Publisher: Springer Science & Business Media
ISBN: 366208578X
Category : Science
Languages : en
Pages : 328
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Book Description
The aim of this book is to provide information about performing experi ments at low temperatures, as well as basic facts concerning the low tem perature properties of liquid and solid matter. To orient the reader, I begin with chapters on these low temperature properties. The major part of the book is then devoted to refrigeration techniques and to the physics on which they are based. Of equal importance, of course, are the definition and measurement of temperature; hence low temperature thermometry is extensively discussed in subsequent chapters. Finally, I describe a variety of design and construction techniques which have turned out to be useful over the years. The content of the book is based on the three-hour-per-week lecture course which I have given several times at the University of Bayreuth between 1983 and 1991. It should be particularly suited for advanced stu dents whose intended masters (diploma) or Ph.D. subject is experimental condensed matter physics at low temperatures. However, I believe that the book will also be of value to experienced scientists, since it describes sev eral very recent advances in experimental low temperature physics and technology, for example, new developments in nuclear refrigeration and thermometry.
Author: Volker Weiss
Publisher:
ISBN:
Category :
Languages : en
Pages : 66
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Book Description
High stress transformation plasticity offers a means of increasing the strength as well as the ductility and toughness of steels. The additional energy absorption associated with the martensitic transformation during deformation is responsible for the enhanced fracture toughness. Prior studies at Syracuse University have shown that the martensite content at fracture is a function of the test temperature and that the notch toughness is strongly temperature dependent. Gold and Koppenaal have reported that TRIP steel exhibited embrittlement at a specific strain rate and testing temperature. The studies by Azrin et al., Weiss et al. and Zackay et al. have shown that an optimum combination of strength, toughness and fatigue crack growth resistance required careful control of austenite metastability with respect to the service condition. For example, a TRIP steel that exhibits high strength and toughness under relatively low strain rates at room temperature may suffer a significant loss of uniform ductility at very high strain rates. Also the same TRIP steel may be inferior in fatigue crack propagation resistance to an ultra high strength material.
Author: GA. Knorovsky
Publisher:
ISBN:
Category : Crack initiation
Languages : en
Pages : 28
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Book Description
A recently implemented fracture control plan for structural steel high-way bridges makes use of a linear relation to describe the effect of strain rate on the ductile/brittle transition temperature as a function of yield strength. Literature data show that the predictions of the aforementioned relation are not general. An alternative analysis is offered along with a qualitative model for understanding the phenomenon. Results of an experimental program investigating microstructural effects on the ductile/brittle strain rate dependence are also presented. The results exhibit linear behavior of ?Tdb versus ??/?, where ?Tdb is the transition temperature shift, ? is the yield stress, and ?? is the change in yield stress caused by strain rate. The magnitude of the temperature shift, however, is dependent upon the test specimen used. Factors discussed include microstructure, type of test specimen (Charpy V-notch, nil ductility temperature [NDT], modified NDT, or compact toughness), crack initiation versus crack propagation, and implications for regulatory bodies.
Author: G. A. Knorovsky
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 106
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Author: Paul E. Magnusen
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
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Author: J. Harding
Publisher:
ISBN:
Category :
Languages : en
Pages : 200
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