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  • STRUCTURAL MECHANICS  (2,553)
  • 1975-1979  (1,043)
  • 1970-1974  (1,510)
Collection
Keywords
Years
Year
  • 1
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    Possibilities and limitations of rod-beam theories (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Rod-beam theories are founded on hypotheses such as Bernouilli's suggesting flat cross-sections under deformation. These assumptions, which make rod-beam theories possible, also limit the accuracy of their analysis. It is shown that from a certain order upward terms of geometrically nonlinear deformations contradict the rod-beam hypotheses. Consistent application of differential geometry calculus also reveals differences from existing rod theories of higher order. These differences are explained by simple examples.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-75466 , DFVLR-FB-78-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The NASTRAN user's manual (level 17.0) (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: NASTRAN embodies a lumped element approach, wherein the distributed physical properties of a structure are represented by a model consisting of a finite number of idealized substructures or elements that are interconnected at a finite of grid points, to which loads are applied. All input and output data pertain to the idealized structural model. The general procedures for defining structural models are described and instructions are given for each of the bulk data cards and case control cards. Additional information on the case control cards and use of parameters is included for each rigid format.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-222(04)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Research needs in aerospace structural dynamics (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The perspective of a NASA Ad Hoc Study Committee on future research needs in structural dynamics within the aerospace industry is presented. It identifies the common aspects of the design process across the industry and establishes the role of structural dynamics in it through a discussion of various design considerations having their basis in structural dynamics. The specific structural dynamics issues involved in these considerations are identified and assessed as to their current technological status and trends. Projections of future requirements based on this assessment are made and areas of research to meet them are identified.
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 79-0826 , Structures, Structural Dynamics, and Materials Conference; Apr 04, 1979 - Apr 06, 1979; St. Louis, MO
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Rigidity of lattice domes (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The means of ensuring total rigidity of lattice domes, using comparison with solid shells of 1-3 layers are discussed. Irregularities of manufacture, processing, and other factors are considered, as they relate to diminution of rigidity. The discussion uses the concepts of upper and lower critical loads on the structure in question.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-75387
    Format: application/pdf
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  • 5
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    Can acoustic emission detect the initiation of fatigue cracks: Application to high-strength light alloys used in aeronautics (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Acoustic emission was used for the detection of fatigue cracking in a number of high-strength light alloys used in aeronautical structures. Among the features studied were: the influence of emission frequency, the effect of surface oxidation, and the influence of grains. It was concluded that acoustic emission is an effective nondestructive technique for evaluating the initiation of fatigue cracking in such materials.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-75306
    Format: application/pdf
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  • 6
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    Accommodating and cracking mechanisms in low-cycle fatigue (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The three main stages of fatigue life (accommodation, crack initiation and crack growth) are briefly reviewed. The cyclic behavior of annealed or predeformed face-centered cubic metals is described. Moreover, two types of alloys (Al-4-Cu and WASPALOY) are examined regarding the influence of the interactions between the precipitates and the dislocations on the cyclic behavior. Data on the percent of life to crack initiation (for a microcrack smaller than about 100 microns) are also given. Finally, experimental and theoretical results on crack growth rates in lowcycle fatigue are described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-75227
    Format: application/pdf
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  • 7
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    Different aspects of low-cycle fatigue (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The experimental and theoretical knowledge in this field is presented. The different relations which correlate the number of cyles to rupture with strain or strain-energy are given. The application of low-cycle fatigue concepts to the crack initiation and crack propagation are briefly studied.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-75226
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Graphic arts techniques and equipment: A compilation (1974)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Technology utilization of NASA sponsored projects involving graphic arts techniques and equipment is discussed. The subjects considered are: (1) modification to graphics tools, (1) new graphics tools, (3) visual aids for graphics, and (4) graphic arts shop hints. Photographs and diagrams are included to support the written material.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-5919(02)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    The NASTRAN User's Manual (Level 15) (1972)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The User's manual for the NASA Structural Analysis (NASTRAN) program is presented. The manual contains all information needed to solve problems with NASTRAN. The volume is instructional and encyclopedic. The manual includes instruction in structural modeling techniques, instruction in input preparation, and information to assist the interpretation of the output. Descriptions of all input data cards, restart procedures, and diagnostic messages are developed.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-SP-222(01)
    Format: application/pdf
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  • 10
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    Report of the NASA Ad Hoc Committee on failure of high strength structural materials (1972)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An analysis of structural failures that have occurred in NASA programs was conducted. Reports of 231 examples of structural failure were reviewed. Attempts were made to identify those factors which contributed to the failures, and recommendations were formulated for actions which would minimize their effects on future NASA programs. Two classes of factors were identified: (1) those associated with deficiencies in existing materials and structures technology and (2) those attributable to inadequate documentation or communication of that technology.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-68850
    Format: application/pdf
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