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  • 1
    Electronic Resource
    Electronic Resource
    Shear strength of shock-loaded alumina as determined with longitudinal and transverse manganin gauges (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1120-1122 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The shear strength of shock-loaded commercial alumina (AD-85 manufactured by Coors) is determined in the 0–140-kbar range of shock stresses. Longitudinal and transverse manganin gauges were used to determine the principal stresses in the shocked specimens. Shear strengths were determined from the difference between the longitudinal and lateral stresses. It was found that the shear strength remains essentially constant at about 27 kbar for shock stresses between 60 kbar (the Hugoniot elastic limit) and the maximum shock amplitude tested in this series (142 kbar). The source for the high shear strength is attributed to the confining pressures that strengthen the comminuted ceramic. Evidence for this interpretation is obtained by considering the release profiles as recorded by the longitudinal gauges when the free-surface rarefactions reach gauge location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339721
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  • 2
    Electronic Resource
    Electronic Resource
    Steady-wave characteristics in shock-loaded steel specimens (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1384-1385 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The steady-wave features of the plastic shock wave in low carbon steel are explored with manganin stress gauges. We show that at the low stress range (20–45 kb) these waves are not steady and that the corresponding Bland numbers are much lower than unity, as expected for nonsteady waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336483
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  • 3
    Electronic Resource
    Electronic Resource
    Possibility of measuring shear waves in oblique-impact experiments with in-material piezoresistance gauges (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3928-3930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We suggest the use of in-material piezoresistance gauges to record shear waves in oblique-impact experiments. The advantages of the proposed technique are discussed in detail and possible candidates for shear gauges are suggested. A preliminary oblique-impact experiment, with a manganin gauge embedded in an alumina target, is described. The gauge record shows the arrival of two waves with the expected time interval as calculated from the longitudinal and shear velocities for alumina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336741
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamic unloading behavior of soda lime glass (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 593-595 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental study was conducted to see if the reverberation plate technique, using commercial manganin stress gauges, could be used to determine the dynamic unloading behavior of brittle materials. Using a 50-mm powder gun, plate impact experiments were conducted on soda lime glass, providing unloading data from stress states from below the Hugoniot elastic limit to 17.0 GPa. The slopes of the unloading paths were found to increase as the peak compressive stress was increased. Such unloading behavior is similar to that of quartz, suggesting that the technique is viable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343575
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  • 5
    Electronic Resource
    Electronic Resource
    Applying Steinberg's model to the Hugoniot elastic limit of porous boron carbide specimens (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 7890-7891 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plate-impact experiments were performed on boron carbide specimens, having different porosities, in order to measure their Hugoniot elastic limit (HEL) values. The measurements were performed with commercial manganin gauges embedded at the back surface of the specimen and backed by a thick Plexiglas disk. The measured values show an almost linear decrease in the HEL values between 194 kbar (For the fully dense material) to 96 kbar for a specimen with 16.3% porosity. These values were compared with a theoretical model [suggested by D. Steinberg (LLL report LLL-UCID-16946, 1975)] which accounts for the dependence of the HEL on porosity, and the agreement is shown to be good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347524
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamic high-pressure properties of AlN ceramic as determined by flyer plate impact (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 167-171 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamic properties of hot-pressed aluminum nitride ceramics were determined in a series of plate impact experiments using longitudinal and transverse in-material manganin gauges. The Hugoniot curve for hot pressed specimens was determined in the range of 0–190 kbar with a value of 94±2 kbar for the Hugoniot elastic limit (HEL). Using both gauge orientations, the stress deviator in the specimens was determined as the difference between longitudinal and transverse stresses. It was found that the stress deviator remains relatively constant above the HEL, and is about 10% higher than the value at the HEL point. The inferred Hugoniot converges to the extrapolation of the hydrostat. Since the convergence is not due to loss of strength, it may be due to a phase change in the AlN from low-pressure (wurtzite) structure to high-pressure (rocksalt) structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350337
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  • 7
    Electronic Resource
    Electronic Resource
    Study of spall and recompaction of ceramics using a double-impact technique (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3415-3418 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new plate impact technique for studying the dynamic properties of shock-damaged materials has been developed. The technique is based on impacting the specimen with two flyer plates which are separated by a small gap. Impact of the first plate causes spall in the target. Impact of the second plate closes the spall. The transmitted shock wave is monitored with a VISAR and/or manganin stress gauge. Analysis of the waves gives the properties of the damaged region. Preliminary results for copper and polycrystalline aluminum oxide have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335759
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  • 8
    Electronic Resource
    Electronic Resource
    Impact-induced failure waves in glass bars and plates (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 3396-3398 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Glass bars and plates were subjected to impact loading. Failure waves were observed to propagate behind the compression waves. Material traversed by the failure wave suffers total loss of tensile strength and substantial drop in shear strength. Failure wave propagation velocities exceed the maximum crack propagation speed, but are not constant. In bars, failure wave speed range from 2.3 to 5.2 mm/μs, increasing with increasing impact velocity; in plates, the wave speed is about 2 mm/μs. The failure is "explosive'' in nature, leading to radial expansion in bars and an increase in mean stress in plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105686
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of dynamic yield strengths with embedded manganin gages in plate-impact and long-rod experiments (1986)
    Springer
    Experimental mechanics 26 (1986), S. 279-282 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The dynamic yield strengths of three steels were determined at strain rates of about 103 s−1 and 106 s−1. The measurements at 103 s−1 were obtained by a new technique based on measurements of large amplitude elastic waves in long bars struck by rigid flyer plates. Embedded manganin gages were used to measure stress, and the gage records were long enough to observe subsequent reverberations between the bar free end and the plastically deformed impact end. The measurements at 106 s−1 were made with a slightly modified version of a conventional flyer-plate impact configuration. The data are combined with static results to show the behavior of these steels at strain rates of 10−3 s−1 to 106 s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02320054
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of tensile flow stress beyond necking at very high strain rate (1986)
    Springer
    Experimental mechanics 26 (1986), S. 319-323 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The objective of this effort was to extend the Bridgman analysis of tensile necking to obtain stress-strain data beyond the point of onset of necking from a split Hopkinson bar. For this purpose, combined analytical and experimental techniques were considered. The analytical efforts were focused on validating the use of Bridgman solutions for high rate of deformation through a finite-element analysis of a tapered tensile specimen. The experimental technique involved the development of a photographic system using a light-emitting diode and a 35-mm rotating drum camera for the observation of necking during dynamic tensile tests conducted with a split Hopkinson tension bar. The developed new technique was successfully used to measure neck profiles of 6061-T6 aluminum, HY100 and 1020 steel tensile specimens. The measured profiles were used with the Bridgman analysis and stress-strain data were obtained to over 70-percent strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02320146
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