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  • Chemistry  (70,742)
  • Chemical Engineering  (5,458)
  • STRUCTURAL MECHANICS
  • 1985-1989  (43,234)
  • 1975-1979  (30,461)
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  • 1
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    Fatigue behavior of 5Ni-Cr-Mo-V steel weldments containing fabrication discontinuities (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities is explored. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Where possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 2
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    Postbuckling behavior of fiber reinforced plates and curved panels (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Results obtained on the postbuckling behavior of plates and curved panels using the NOLIN computer program are reported. As an example, the postbuckling behavior of a flexible, isotropic and quadrangular plate is solved and the results are found to be accurate and relibale in comparison with those in the literature. The fatigue-deformation behavior of a rectangular CKL plate is measured, and the results are compared with those from NOLIN and other computer programs. A slightly curved panel with optimized layering is studied.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TT-20094 , NAS 1.77:20094
    Format: text
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  • 3
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    Design of Software for Design of Finite Element for Structural Analysis (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The concepts of software engineering which allow a user of the finite element method to describe a model, to collect and to check the model data in a data base as well as to form the matrices required for a finite element calculation are examined. Next the components of the model description are conceived including the mesh tree, the topology, the configuration, the kinematic boundary conditions, the data for each element, and the loads. The possibilities for description and review of the data are considered. The concept of the segments for the modularization of the programs follows the components of the model description. The significance of the mesh tree as a globular guiding structure will be understood in view of the principle of the unity of the model, the mesh tree, and the data base. The user-friendly aspects of the software system will be summarized: the principle of language communication, the data generators, error processing, and data security.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-88528 , NAS 1.15:88528
    Format: application/pdf
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  • 4
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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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  • 5
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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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  • 6
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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
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  • 7
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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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  • 8
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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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  • 9
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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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  • 10
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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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