Influence of Strain Rate and Temperature on the Mechanical Behavior of Beryllium PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The compressive stress-strain response of three grades of beryllium were studied as a function of strain rate and temperature. Grades S2OOD, E, and F represent a historical perspective of beryllium processing from the 1960's through 1990's technology. The purpose of this study was to measure the mechanical behavior of beryllium over a range of deformation conditions for constitutive model development and to obtain microstructural evidence for deformation mechanisms. The compressive stress-strain response was found to be independent of grade and strongly dependent on the applied strain rate between 0.001 and 8000. The strain-hardening response displayed a moderate temperature dependence between 77 K and 873 K Because distinct yield was not observed, the intercept-stress from linear strain-hardening fits was analyzed and was found to be only weakly dependent on strain rate and temperature above ambient. Microstructural examination of SHPB specimens revealed that twinning was extensive at strains between 7-22%. A SHPB sample deformed to over 20% strain contained both extensive twinning and grain boundary microcracking.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
The compressive stress-strain response of three grades of beryllium were studied as a function of strain rate and temperature. Grades S2OOD, E, and F represent a historical perspective of beryllium processing from the 1960's through 1990's technology. The purpose of this study was to measure the mechanical behavior of beryllium over a range of deformation conditions for constitutive model development and to obtain microstructural evidence for deformation mechanisms. The compressive stress-strain response was found to be independent of grade and strongly dependent on the applied strain rate between 0.001 and 8000. The strain-hardening response displayed a moderate temperature dependence between 77 K and 873 K Because distinct yield was not observed, the intercept-stress from linear strain-hardening fits was analyzed and was found to be only weakly dependent on strain rate and temperature above ambient. Microstructural examination of SHPB specimens revealed that twinning was extensive at strains between 7-22%. A SHPB sample deformed to over 20% strain contained both extensive twinning and grain boundary microcracking.
Author: R. G. Kumble Publisher: ISBN: Category : Languages : en Pages : 70
Book Description
The purpose of this program was to study the effect of high strain rates and elevated temperatures on the mechanical properties of three grades of beryllium: S-200, I-400 and Ingot Sheet. Uniaxial tension and compression tests were conducted at strain rates of .001 to 1000/per sec. The test temperatures ranged from 72 to 700 F. This report includes a literature survey and a discussion on the problems encountered during testing in addition to the presentation and discussion of results. The influence of oxide content, grain size, and fabrication history on the strain rate sensitivity and other mechanical properties of beryllium is examined. (Author).
Author: U. S. Lindholm Publisher: ISBN: Category : Languages : en Pages : 98
Book Description
The strength properties of S-200E beryllium and 6Al-4V titanium were determined under conditions of combined stress, elevated temperatures and high strain rates. Beryllium specimens were obtained from both extruded rod and hot- pressed block. The range of test conditions included strain rates from 0.001 to 1000/sec, temperatures from 70 to 1000F, and both uniaxial and biaxial states of stress. The biaxial stress states were obtained with thin-walled tubular specimens loaded with axial tension or compression, torsion, or internal pressure. The data presented include the stress-strain curves, yield and failure surfaces in stress space, and the surfaces for total strain to failure. The latter indicates the relative ductility achieved with different applied stress ratios. The effect of temperature and of strain rate on the size and shape of the yield and failure surfaces is determined. In most cases the experimental data correlate well with known yield and failure criteria.
Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
The high-strain-rate stress-strain responses of commercial hot-pressed beryllium and rolled-sheet beryllium were studied as a function of orientation in compression and room temperature. Hot-pressed beryllium exhibits isotropic mechanical properties; whereas 16:1 rolled sheet was highly anisotropic. Rolled sheet displayed a factor of two difference in strength between the thickness and in-plane (lowest) directions. Twinning is a key deformation mechanism at high rates.
Author: Publisher: ISBN: Category : Nuclear energy Languages : en Pages : 900
Book Description
NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
Author: Publisher: ISBN: Category : Languages : en Pages : 42
Book Description
An experimental technique is described for obtaining high rate tensile stress-strain data on materials with limited ductility. A modified split Hopkinson bar apparatus is used to obtain data on three advanced structural grades of beryllium at strain rates up to 500/sec. The data indicate that there is no significant loss in ductility with increasing strain rate in any of the three grades of beryllium. Flow stress is shown to increase linearly with strain rate up to strain rates of 1-10/sec and then more abruptly at higher rates.
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Author: R. G. Kumble
Author: R. G. O'Rourke
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Author: U. S. Lindholm
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Author: E. E. Baldwin
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Author: G. I. Turner
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