Download or read book Effect of Grain Size and Strain Rate on Dislocation Substructures and Mechanical Properties in OFHC Copper written by Hursha Shankaranarayan and published by . This book was released on 1993 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Abstracts written by and published by . This book was released on 1997 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High strain High strain rate Deformation of Copper written by Umberto Ramos de Andrade and published by . This book was released on 1993 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crystal Plasticity written by Wojciech Polkowski and published by MDPI. This book was released on 2021-04-27 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents a collection of 25 original papers (including one review paper) on state-of-the art achievements in the theory and practice of crystals plasticity. The articles cover a wide scope of research on materials behavior subjected to external loadings, starting from atomic-scale simulations, and a new methodological aspect, to experiments on a structure and mechanical response upon a large-scale processing. Thus, a presented contribution of researchers from 18 different countries can be virtually divided into three groups, namely (i) “modelling and simulation”; (ii) “methodological aspects”; and (iii) “experiments on process/structure/properties relationship”. Furthermore, a large variety of materials are investigated including more conventional (steels, copper, titanium, nickel, aluminum, and magnesium alloys) and advanced ones (composites or high entropy alloys). The book should be interested for senior students, researchers and engineers working within discipline of materials science and solid state physics of crystalline materials.
Download or read book Mechanical Properties of Materials at High Rates of Strain 1989 written by John Harding and published by . This book was released on 1989 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises invited and contributed papers in the major areas of impact engineering: dynamic fracture; void growth and ductile fracture; shear banding; experimental methods of material characterization; constitutive modelling of material behavior; numerical modelling; microstructural effects at high rates of strain; impact of ceramics; impact of composites; dynamic plastic response of structures; nuclear industry applications; and aerospace applications. No subject index. Annotation(c) 2003 Book News, Inc., Portland, OR (booknews.com)
Download or read book Grain Size Effects on the High Strain Rate Deformation of Copper written by Michael Earle Stevenson and published by . This book was released on 2001 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Loading Rate on the Mechanical Response and Substructure Evolution of Shock loaded Copper written by and published by . This book was released on 1991 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock recovery experiments on copper have been conducted to investigate the influence of loading rate and stress amplitude on defect storage and post-shock mechanical properties. The shock risetimes varied approximately from one nanosecond for the shock experiments to one microsecond for quasi-isentropic loading experiments. All the experiments had the same peak pressure and pulse duration. Decreasing the strain-rate of loading is shown to increase both the defect storage and post-shock yield strength of copper. The effect of loading rate on post-shock substructure and mechanical response of impacted copper is postulated to be directly related to the amount of dislocation motion before interaction with other dislocations and to the amount of reversible dislocation motion and resultant annihilation during the rarefaction portion of the shock-release cycle. 10 refs., 5 figs.
Download or read book Strain Rate Temperature and Representative Length Scale Influence on Plasticity and Yield Stress in Copper written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock compression of materials constitutes a complex process involving high strain rates, elevated temperatures and compression of the lattice. Materials properties are greatly affected by temperature, the representative length scale and the strain rate of the deformation. Experimentally, it is difficult to study the dynamic microscopic mechanisms that affect materials properties following high intensity shock loading, but they can be investigated using molecular dynamics (MD) simulations. Moreover, MD allows a better control over some parameters. We are using MD simulations to study the effect of the strain rate, representative length scale and temperature on the properties of metals during compression. A half-million-atom Cu sample is subjected to strain rates ranging from 107 s−1 to 1012 s−1 at different temperatures ranging from 50K to 1500K. Single crystals as well as polycrystals are investigated. Plasticity mechanisms as well as the evolution of the micro- and macro-yield stress are observed. Our results show that the yield stress increases with increasing strain rate and decreasing temperature. We also show that the strain rate at which the transition between constant and increasing yield stress as a function of the temperature occurs increases with increasing temperature. Calculations at different grain sizes will give an insight into the grain size effect on the plasticity mechanisms and the yield stress.
Download or read book The Effects of Specimen Grain Size and Environment on the Fatigue Life of OFHC Copper written by W. Knapp and published by . This book was released on 1968 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The note presents the results of a study of the effects of grain size and environment on the fatigue life of OFHC copper specimens. Tests conducted in alternating torsion on specimens of two different grain size groups showed that an increase in specimen grain size results in a decrease in fatigue life at both high and low strain amplitudes. Similar tests under low and high humidity showed that humidity has a negligible effect on fatigue life for either high or low strain amplitude and for large or small grain size. The effects of elevated temperatures were found to be more complex. At high strain amplitudes the fatigue life decreased continuously as the temperature was increased. At low amplitudes the life dropped as the temperature was raised to 200C., but then remained approximately constant when the temperature was raised further to 350C. An examination of the microstructural changes caused by the fatigue tests revealed damage characteristics of Wood's H range for the tests at high amplitudes and room temperature, with slight variations for the tests at high temperature. Damage characteristics of Wood's S range were found for low amplitude tests at room temperature, with significant grain growth occurring at high temperature.
Download or read book The Effect of Wire Drawing Speed on the Substructures and Mechanical Properties in OFHC Copper written by S. Thiagarajan and published by . This book was released on 1991 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metallurgical and Materials Applications of Shock wave and High strain rate Phenomena written by Lawrence Eugene Murr and published by Elsevier Publishing Company. This book was released on 1995 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work, with emphasis on materials applications and effects, overviews recent research in the metallurgical materials applications of shock-wave and high-strain-rate phenomena. It may be used as a general reference tool and teaching component dealing with dynamic effects in materials.
Download or read book World Aluminum Abstracts written by and published by . This book was released on 1973 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mechanical Properties of Copper at High Strain Rates Volume I the Effect of Strain Rate on the Flow Stress of Copper written by J. D. Lubahn and published by . This book was released on 1966 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental method of determining dynamic flow stress where the stress is homogeneous is developed using a pendulum bar suspension system. A small specimen is mounted on the end of one of the bars and the other bar is impacted on the free and of the specimen. For copper, the dynamic stress is 29% larger than the static stress for a strain rate of about 100/sec (or an increase in strain rate of about 5 orders of magnitude). For various tests, the increase in dynamic stress over the static value varied from 17% to 45%. This variation is comparable with the expected scatter for a typical test (plus or minus 10%) predicted from the uncertainties in measurement. (Author).
Download or read book Metals Abstracts Index written by and published by . This book was released on 1983 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Dynamic Properties of Materials Volume 5 OFHC Copper written by Douglas R. Christman and published by . This book was released on 1971 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an experimental study on the dynamic properties of OFHC copper (1/2-hard) are presented. Areas studied included stress-strain-strain rate and reverse loading behavior, elastic constants, equation of state, compressive and release wave characteristics, and spall fracture. The material showed approximately elastic-perfectly plastic behavior under uniaxial stress compression with slight rate sensitivity (0.005 to 950/sec strain rates and 20, 204 and 370C). Longitudinal and shear wave velocities at 20C were 4.757 and 2. 247 mm/microsec, and temperature and pressure dependence was also measured and various elastic constants were calculated. The shock wave equation of state (EOS) was measured from 10 to 200 kbars as sigma-H = 1.5 + 344 u sub p + 143 u sub p to the 2nd power. The EOS was also calculated from the elastic constants and comparisons made with the shock wave EOS. Compressive wave tests showed a ramped, non-steady-state elastic precursor with very rapid decay (> 80% in 2 mm) . The yield level from compressive wave profile measurements was considerably lower than that determined from uniaxial stress and EOS tests. Shock wave profiles showing both release wave behavior and attenuation were obtained. The impact velocity required for spall fracture was found to increase with decreasing pulse width.
