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  • 1
    Electronic Resource
    Electronic Resource
    An investigation of the losipescu and asymmetrical four-point bend tests (1987)
    Springer
    Experimental mechanics 27 (1987), S. 57-63 
    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 Iosipescu shear test, utilizing a notched specimen in bending and a modification—the asymmetrical four-point bend (AFPB) test—were evaluated as shear tests for composites. This paper summarizes the results of an extensive numerical and experimental investigation of the Iosipescu and AFPB test methods. Finite-element analyses were conducted to assess the influence of notch parameters and load locations on the stress state in the specimen. The shear moduli and the shear strengths were experimentally measured for a quasiisotropic graphite/epoxy laminate using both the Iosipescu and the AFPB test methods. The tests were conducted for various combinations of notch parameters and load locations. The test results indicate that changes in the notch geometry and load locations aimed at improving the stress distribution in the test section resulted in unexpected changes in the failure mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02318864
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    An instrumented fastener for shear force measurements in joints (1994)
    Springer
    Experimental mechanics 34 (1994), S. 16-22 
    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 A preliminary investigation has been conducted on instrumented fasteners for use as sensors to measure the shear loads transmitted by individual fasteners installed in double-splice joints. Calibration and load verification tests were conducted for instrumented fasteners installed at three fastener torque levels. Results from calibration tests show that the shear strains obtained from the instrumented fasteners vary linearly with the applied load and that the instrumented fasteners can be effectively used to measure shear loads transmitted by individual fasteners installed in double-splice joints. Tests were also conducted with three instrumented fasteners installed in a typical double-splice joint. The test results showed that the load distribution between individual fasteners is dependent on the location of the fastener in the joint and the fastener torque level. The fastener located near the end of the joint with the single plate carried more load than the fasteners located near the end of the joint with the two plates. Installing the fasteners with a torque greater than finger tight results in a significant amount of the load being carried by friction between the faying surfaces of the plates even if the faying surfaces are polished and lubricated. Increasing the fastener torque increases the load being carried by friction between the faying surfaces of the joint. Increasing friction between the faying surfaces of the joint. Increasing the fastener torque also results in a more uniform distribution of the loads between the individual fasteners for joints in aluminum plates with two fasteners, but does not have a significant effect for joints in steel plates with three fasteners.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02328437
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    Paper (German National Licenses)
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  • 3
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    Amplitude Sensing below the Zero-Point Fluctuations with a Two-Dimensional Trapped-Ion Mechanical Oscillator (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-07-01
    Description: Author(s): K. A. Gilmore, J. G. Bohnet, B. C. Sawyer, J. W. Britton, and J. J. Bollinger A spin-based technique is able to measure the center-of-mass motion of a 2D crystal of trapped ions to a precision 40 times below the object’s zero-point energy. [Phys. Rev. Lett. 118, 263602] Published Thu Jun 29, 2017
    Keywords: Atomic, Molecular, and Optical Physics
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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    PAPER CURRENT
  • 4
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    Dislocation core radii near elastic stability limits (2013)
    American Physical Society (APS)
    Details
    Publication Date: 2013-04-23
    Description: Author(s): C. A. Sawyer, J. W. Morris, Jr., and D. C. Chrzan Recent studies of transition metal alloys with compositions that place them near their limits of elastic stability [e.g., near the body-centered-cubic (BCC) to hexagonal-close-packed (HCP) transition] suggest interesting behavior for the dislocation cores. Specifically, the dislocation core size is ... [Phys. Rev. B 87, 134106] Published Mon Apr 22, 2013
    Keywords: Structure, structural phase transitions, mechanical properties, defects
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    An investigation of the losipescu and asymmetrical four-point bend tests (1987)
    Springer
    Details
    Publication Date: 1987-03-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 6
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    An instrumented fastener for shear force measurements in joints (1994)
    Springer
    Details
    Publication Date: 1994-03-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 7
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    An instrumented fastener for shear force measurements in joints (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A preliminary investigation has been conducted on instrumented fasteners for use as sensors to measure the shear loads transmitted by individual fasteners installed in double-splice joints. Calibration and load verification tests were conducted for instrumented fasteners installed at three fastener torque levels. Results from calibration tests show that the shear strains obtained from the instrumented fasteners vary linearly with the applied load and that the instrumented fasteners can be effectively used to measure shear loads transmitted by individual fasteners installed in double-splice joints. Tests were also conducted with three instumented fasteners installed in a typical double-splice joint. The test results showed that the load distribution between individual fasteners is dependent on the location of the fastener in the joint and the fastener torque level.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Experimental Mechanics (ISSN 0014-4851); 34; 1; p. 16-22
    Format: text
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  • 8
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    An investigation of the Iosipescu and Asymmetrical Four-Point Bend tests for composite materials (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The results of an extensive analytical and experimental investigation of the Iosipescu and Asymmetrical Four-Point Bend (AFPB) test methods are summarized. Finite element analyses were used to assess the influence of notch parameters and load locations on the stress state in the specimens. The shear moduli and shear strengths were experimentally measured for quasi-isotropic graphite-epoxy laminates using both the Iosipescu and the AFPB test methods with various combinations of notch parameters and load locations. The test results indicate that changes in the notch geometry and load locations aimed at improving the stress distribution in the test section result in unexpected changes in the failure mode.
    Keywords: COMPOSITE MATERIALS
    Format: text
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  • 9
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    Derivation and test of elevated temperature thermal-stress-free fastener concept (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Future aerospace vehicles must withstand high temperatures and be able to function over a wide temperature range. New composite materials are being developed for use in designing high-temperature lightweight structures. Due to the difference between coefficients of thermal expansion for the new composite materials and conventional high-temperature metallic fasteners, innovative joining techniques are needed to produce tight joints at all temperatures without excessive thermal stresses. A thermal-stress-free fastening technique is presented that can be used to provide structurally tight joints at all temperatures even when the fastener and joined materials have different coefficients of thermal expansion. The derivation of thermal-stress-free fasteners and joint shapes is presented for a wide variety of fastener materials and materials being joined together. Approximations to the thermal-stress-free shapes that result in joints with low-thermal-stresses and that simplify the fastener/joint shape are discussed. The low-thermal-stress fastener concept is verified by thermal and shear tests in joints using oxide-dispersion-strengthened alloy fasteners in carbon-carbon material. The test results show no evidence of thermal stress damage for temperatures up to 2000 F and the resulting joints carried shear loads at room temperature typical of those for conventional joints.
    Keywords: MECHANICAL ENGINEERING
    Type: Welding, Bonding and Fastening, 1984; p 105-122
    Format: application/pdf
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  • 10
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    Effect of stitching on the strength of bonded composite single lap joints (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 23; 1744-174
    Format: text
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