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  • Other Sources  (1,193)
  • NASA Technical Reports  (1,193)
  • STRUCTURAL MECHANICS  (1,193)
  • 2005-2009
  • 1980-1984  (1,192)
  • 1940-1944  (1)
  • 1
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    Fracture control plan for propellant and pressurant tanks (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: To assure the functional integrity of the GLL-RPM fuel and pressurized gas tank, all activities during entire lifetime of the tank, from manufacture to the end of the mission, must be monitored. Specifications are given for all procedures which influence the tank structure including design, manufacture, cleaning, test operations, and storage. Tests to be conducted to demonstrate that requirements of the fracture control plan are satisfied include static tests, cyclic load tests, proof tests, He-leak test, and acceptance tests.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-76554
    Format: application/pdf
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  • 2
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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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  • 3
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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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  • 4
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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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  • 5
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    Measurement of the inertial constants of a rigid or flexible structure of arbitrary share through a vibration test (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The inertial constants of an aircraft rocket, or of any other structure, are defined without materializing any rotating axis. The necessary equipment is very similar to that used normally for ground vibration tests. An elastic suspension is used to obtain the total natural modes corresponding to the motions of the structure as a solid. From the measurements of the generalized masses of these modes it is possible to compute the inertial constants: (1) center of inertia; (2) tensor of inertia; and (3) mass. When the structure is not strictly rigid a purification process, based on the mean square method makes it possible to rigidify it at the price of some approximations and a few more measurements. Eventual additional masses, that are not parts of the structure, can be taken into account.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-77557 , NAS 1.15:77557
    Format: application/pdf
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  • 6
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    The NASTRAN user's manual (1983)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: All information directly associated with problem solving using the NASTRAN program is presented. This structural analysis program uses the finite element approach to structural modeling wherein the distributed finite properties of a structure are represented by a finite element of structural elements which are interconnected at a finite number of grid points, to which loads are applied and for which displacements are calculated. Procedures are described for defining and loading a structural model. Functional references for every card used for structural modeling, the NASTRAN data deck and control cards, problem solution sequences (rigid formats), using the plotting capability, writing a direct matrix abstraction program, and diagnostic messages are explained. A dictionary of mnemonics, acronyms, phrases, and other commonly used NASTRAN terms is included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-222(06) , NAS 1.12/6:222(06)
    Format: application/pdf
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  • 7
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    Laminated anisotropic reinforced plastic plates and shells (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Basic technical theories and engineering calculation equations for anisotropic plates and shells made of rigid reinforced plastics, mainly laminated fiberglass, are presented and discussed. Solutions are given for many problems of design of structural plates and shells, including curved sections and tanks, as well as two chapters on selection of the optimum materials, are given. Accounting for interlayer shearing and transverse separation, which are new engineering properties, are discussed. Application of the results obtained to thin three ply plates and shells wth a light elastic filler is presented and discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-76585
    Format: application/pdf
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  • 8
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    Strength of anisotropic wood and synthetic materials (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The possibility of using general formulas for determining the strength of different anisotropic materials is considered, and theoretical formulas are applied and confirmed by results of tests on various nonmetallic materials. Data are cited on the strength of wood, plywood, laminated wood plastics, fiber glass-reinforced plastics and directed polymer films.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-76535
    Format: application/pdf
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  • 9
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    Anisotropy of machine building materials (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The results of experimental studies of the anisotropy of elastic and strength characteristics of various structural materials, including pressure worked metals and alloys, laminated fiberglass plastics, and laminated wood plastics, are correlated and classified. Strength criteria under simple and complex stresses are considered as applied to anisotropic materials. Practical application to determining the strength of machine parts and structural materials is discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-76536
    Format: application/pdf
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  • 10
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    Theory of twisted nonuniformly heated bars (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Nonlineary distributed stresses in twisted nonuniformly heated bars of arbitrary cross section are calculated taking into account various elasticity parameters. The approximate theory is shown to be sufficiently general and accurate by comparison with experimental data.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-75758
    Format: application/pdf
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