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Mechanical And Structural Changes During The Deformation Of Copper By Fatigue
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Book Synopsis Mechanical and Structural Changes During the Deformation of Copper by Fatigue by : J. T. McGrath
Download or read book Mechanical and Structural Changes During the Deformation of Copper by Fatigue written by J. T. McGrath and published by . This book was released on 1960 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical and structural changes during the deformation of copper by fatique by : J T. McGrath
Download or read book Mechanical and structural changes during the deformation of copper by fatique written by J T. McGrath and published by . This book was released on 1960 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Nano-scale Twinning on the Fracture, Fatigue and Wear Properties of Copper by : Aparna Singh (Ph.D.)
Download or read book Effect of Nano-scale Twinning on the Fracture, Fatigue and Wear Properties of Copper written by Aparna Singh (Ph.D.) and published by . This book was released on 2011 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain refinement in materials has been one of the most common strategies for improving the strength of materials. However this comes at the price of reduced ductility, fracture toughness and stable fatigue crack propagation life. It has been shown that controlled introduction of nano scale growth twins in ultra fined grained (UFG) Cu through pulsed electro deposition leads to an increase in strength while maintaining a significant amount of ductility. Besides, introduction of deformation twins by the process of dynamic plastic deformation (DPD) involving repeated compaction of coarse-grained (CG) copper at high strain rates and cryogenic temperatures have also shown similar trends in terms of improved strength and considerable strain before failure. Unlike grain boundaries, twin boundaries do not adversely affect the electrical conductivity and resistance towards electro migration of copper. However there have been no studies done to elucidate the role of nano-scale twins in affecting the fracture toughness, stable crack propagation and response under contact fatigue. The aim of the current work was to gain an understanding of the role of microstructural length scale and design in terms of the introduction of twin boundaries vs. grain refinement in influencing the above-mentioned properties. With this aim stable crack propagation and fracture toughness studies were done on UFG copper specimens produced by pulsed electro deposition with an average grain size of 400-500nm but different twin densities to elucidate the effect of twin density on the damage tolerance of Cu. It was found that unlike grain refinement, twin lamellae refinement leads to an improvement in fracture toughness and stable fatigue crack growth life. In order to characterize the contact fatigue response of nano twinned copper, frictional sliding experiments were performed with a conical diamond indenter. The effects of twin density and number of repetitions of sliding cycles on the evolution of frictional coefficient and material pile up around the diamond indenter were studied quantitatively using depth-sensing instrumented sliding indentation. Cross-sectional focused ion beam (FIB) and scanning electron microscopy (SEM) observations were used to systematically monitor deformation-induced structural changes as a function of the number of frictional sliding passes. Nano indentation tests on the sliding tracks coupled with large-deformation finite element modeling (FEM) simulations were used to assess local gradients in mechanical properties and deformation around the indenter track. The results indicate that friction evolution as well as local mechanical response is more strongly influenced by local structure evolution during repeated sliding than by the initial microstructure. The frictional sliding experiments also lead to the striking result that Cu specimens with both high and low density of nano twins eventually converge to a similar microstructure underneath the indenter after repeated tribological deformation. Similar trend of convergence of microstructure and hardness in the vicinity of the scratch was also observed for DPD and CG Cu. This trend strongly mirrors the well-known steady-state response of microcrystalline copper to cyclic loading. General perspectives on contact fatigue response of nano-twinned copper are developed on the basis of these new findings.
Book Synopsis The Canadian Mining and Metallurgical Bulletin by :
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Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1953-07 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrically Assisted Forming by : Wesley A. Salandro
Download or read book Electrically Assisted Forming written by Wesley A. Salandro and published by Springer. This book was released on 2014-08-16 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maximizing reader insights into the latest research findings and applications of Electrically-Assisted Forming (EAF) – whereby metals are formed under an electric current field – this book explains how such a process produces immediate improved formability of metals beyond the extent of thermal softening, and allows metals to be formed to greater elongation with lower mechanical energy as well as allowing for lightweight brittle metals such as magnesium and titanium to be formed without external heating or annealing, enabling the more effective use of these lightweight metals in design. Including case studies that illustrate and support the theoretical content and real-world applications of the techniques discussed, this book also serves to enrich readers understanding of the underlying theories that influence electro-plastic behaviour. The authors have extensive experience in studying Electrically-Assisted Forming and have written extensively with publications including experimental works, technical briefs, conference proceedings, journal articles, and analytical models.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Materials Structure & Micromechanics of Fracture V by : Pavel andera
Download or read book Materials Structure & Micromechanics of Fracture V written by Pavel andera and published by Trans Tech Publications Ltd. This book was released on 2007-12-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). The main goal of these proceedings was to demonstrate the use of a variety of multi-scale approaches, ranging from the atomistic to the macroscopic level, and in this it succeeds admirably.
Book Synopsis Dictionary Catalog of the Department Library by : United States. Department of the Interior. Library
Download or read book Dictionary Catalog of the Department Library written by United States. Department of the Interior. Library and published by . This book was released on 1967 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications of the National Institute of Standards and Technology ... Catalog by : National Institute of Standards and Technology (U.S.)
Download or read book Publications of the National Institute of Standards and Technology ... Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1987 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Changes During Rotating Cantilever Fatigue Tests on Annealed Copper by : R. B. Davies
Download or read book Structural Changes During Rotating Cantilever Fatigue Tests on Annealed Copper written by R. B. Davies and published by . This book was released on 1954 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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