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  • STRUCTURAL MECHANICS
  • 2020-2023
  • 1980-1984  (314)
  • 1965-1969
  • 1984  (314)
  • 1
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    Measurement of high temperature strain by the laser-speckle strain gauge (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: By using the laser-speckle strain gauge, the strain of metal at the temperature lower than 250 C is measured. The principle of the gauge is to measure the expansion or contraction of the fine structures of surface by detecting the resultant speckle displacement in an optoelectronic way, whereby the effect of rigid-body motion is automatically cancelled out with the aid of a differential detection system. A transportable apparatus was built and a comparison experiment performed with a resistance strain gauge at room temperature. It has a strain sensitivity of .00002, a gauge length smaller than 1 mm, and no upper limit in a range of strain measurement. In the measurement of high-temperature strain it is free from the need for a dummy gauge and insensitive to an electric drift effect. As examples of strain measurement at high-temperature, thermal expansion and contraction of a top of a soldering iron are measured. The interval of the measurement can be made at shortest 1.6 sec. and the change in the strain is clearly followed until the ultimate stationary temperature is reached.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77751 , NAS 1.15:77751
    Format: application/pdf
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  • 2
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    Back stress in dislocation creep. Part 1: Basic concepts and measuring techniques (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A theory is proposed whereby the plastic deformation of metal materials is determined by the difference between the applied stress and the back stress which characterizes the resistance of the material to plastic deformation. The back stress is usually equivalent to the internal stress or the friction stress and depends on the magnitude of the applied stress and temperature. The concept of back stress is applied to the case of the dislocation creep of precipitation-hardened or dispersion-strengthened metal materials. An additivity rule is formulated which can be useful in interpreting the creep behavior of such materials.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77773 , NAS 1.15:77773
    Format: application/pdf
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  • 3
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    Shock testing of a nitrogen tank (Cryo diffusion type 220 VLR) on the middle weight shock stand (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Results of vertical and horizontal shock tests on type 200 VLR nitrogen tank are given.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77747 , NAS 1.15:77747
    Format: application/pdf
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  • 4
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    Bending strength studies on hot-pressed silicon carbide (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The 4-point bending strength of 4 grades of hot-pressed SiC was determined at different temperatures. With a transgranular mode of fracture the values for bending strength are retained up to high temperatures. For intergranular fracture the decrease of strength is governed by subcritical crack growth. The intergranular fracture is caused by a high content of silicate glassy phase at the grain boundaries of hot-pressed SiC.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77512 , NAS 1.15:77512
    Format: application/pdf
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  • 5
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    The statistical theory of the fracture of fragile bodies. Part 2: The integral equation method (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: It is demonstrated how with the aid of a bending test, the Weibull fracture risk function can be determined - without postulating its analytical form - by resolving an integral equation. The respective solutions for rectangular and circular section beams are given. In the first case the function is expressed as an algorithm and in the second, in the form of series. Taking into account that the cumulative fracture probability appearing in the solution to the integral equation must be continuous and monotonically increasing, any case of fabrication or selection of samples can be treated.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77449 , NAS 1.15:77449
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  • 6
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    Stress analysis of Pathfinder-2 models (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Stress analysis of the Pathfinder 2 fighter model was performed to determine a method for leading- and trailing-edge attachment that gives acceptable stress levels. Structural modeling of the wing was done using the finite element code SPAR. For the models studied, one ordinary lap joint was found to be satisfactory for the leading-edge flap, however, the alternating surface segmented lap joint method fo attachment was necessary for the trailing-edge flap to obtain acceptable stress levels.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-172458 , NAS 1.26:172458
    Format: application/pdf
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  • 7
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    Stresses in pin-loaded orthotropic plates using photoelasticity (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The stresses in transparent glass-epoxy plates loaded by a steel pin through a hole were determined by photoelasticity. The stresses around the hole edge, across the net section, along the shear out line, and on the centerline below the hole for quasiisotropic, unidirectional, and angle ply plates are outlined. Stresses in an isotropic comparison specimen are also presented. Stress concentration factors for several locations around the plates are tabulated. The experimental apparatus and the experimental technique are discussed. The isochromatic and isoclinic fringe patterns for the four plates are shown. A description of the necessary photoelastic theory is appended.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-172498 , NAS 1.26:172498
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  • 8
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    Flutter parametric studies of cantilevered twin-engine-transport type wing with and without winglet. Volume 1: Low-speed investigations (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Flutter characteristics of a cantilevered high aspect ratio wing with winglet were investigated. The configuration represented a current technology, twin-engine airplane. A low-speed and high-speed model were used to evaluate compressibility effects through transonic Mach numbers and a wide range of mass-density ratios. Four flutter mechanisms were obtained in test, as well as analysis from various combinations of configuration parameters. The coupling between wing tip vertical and chordwise motions was shown to have significant effect under some conditions. It is concluded that for the flutter model configurations studied, the winglet related flutter was amenable to the conventional flutter analysis techniques.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-172410-VOL-1 , NAS 1.26:172410-VOL-1
    Format: application/pdf
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  • 9
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    Retardation analytical model to extend service life (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A fatigue crack growth model that incorporates crack growth retardation effects and is applicable to the materials characteristics and service environments of high performance LH2/LO2 engine systems is discussed. Future Research plans are outlined.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-171177 , NAS 1.26:171177
    Format: application/pdf
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  • 10
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    Development of numerical procedures for analysis of complex structures (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper is concerned with the development of novel numerical procedures for the solution of static, stability, free vibration and dynamic response analysis of large, complex practical structures. Thus, details of numerical algorithms evolved for dynamic analysis of usual non-rotating and also rotating structures as well as finite dynamic elements are presented in the paper. Furthermore, the article provides some description of a general-purpose computer program STARS specifically developed for efficient analysis of complex practical structures.
    Keywords: STRUCTURAL MECHANICS
    Type: International Conference on Space Structures, 3rd, University of Surrey; Sep 04, 1984 - Sep 14, 1984; Surrey
    Format: text
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