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  • BIOSCIENCES
  • STRUCTURAL MECHANICS
  • 2020-2024
  • 1985-1989  (38)
  • 1965-1969
  • 1955-1959
  • 1986  (38)
  • 1
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    Thermomechanical characterization of Hastelloy-X under uniaxial cyclic loading (1986)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: In most high-temperature engineering applications, components are subjected to complex combinations of thermal and mechanical loading during service. A number of viscoplastic constitutive models were proposed which potentially can provide mathematical descriptions of material response under such conditions. Implementation of these models into large finite element codes such as MARC has already resulted in much improved inelastic analysis capability for hot-section aircraft engine components. However, a number of questions remain regarding the validity of methods adopted in characterizing these constitutive models for particular high-temperature materials. One area of concern is that the majority of experimental data available for this purpose are determined under isothermal conditions. This is in contrast to service conditions which, as noted above, almost always involve some form of thermal cycling. The obvious question arises as to whether a constitutive model characterized using an isothermal data base can adequately predict material response under thermomechanical conditions. An experimental program was initiated within the HOST program to address this particular concern. The results of the most recent isothermal and thermomechanical experiments are described.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Turbine Engine Hot Section Technology 1986; p 293-305
    Format: application/pdf
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  • 2
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    Damped response of shells by a constrained viscoelastic layer (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: Vibration absorbers are introduced into an asymmetric configuration of thin cylinders and tori enclosing an acoustic medium. The absorbers consist of thin axial strips bonded to the cylinder with a thin viscoelastic layer. The constrained layer dissipates the energy of relative motions between strip and cylinder. The absorber is most effective on response modes with two or more circumferential waves. The use of transfer matrices is extended to the coupled cylinder-absorber system.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: ASME, Transactions, Journal of Applied Mechanics (ISSN 0021-8936); 53; 902-908
    Format: text
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  • 3
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    Importance of anisotropy on buckling of compression-loaded symmetric composite plates (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA Journal (ISSN 0001-1452); 24; 1831-183
    Format: text
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  • 4
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    Preliminary design of cracked-lap shear specimen thickness for determination of interlaminar fracture toughness (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: This paper outlines a technique for preliminary sizing of the adherends for cracked-lap-shear specimen to assure delamination instead of adherend failure. The cracked-lap-shear specimen is a popular specimen used for determination of mixed mode interlaminar fracture toughness of composites. Thin adherends, on the order of three plies thick, have been used successfully in the past for determination of fracture toughness of rather brittle matrix systems. However, the tougher matrices now being considered for composite applications require thicker adherends in order to get composite delamination rather than adherend failure. The optimum thickness is obtained on the basis that the critical value of the strain energy release rate is reached at the delamination front before the ultimate strength is reached in the adherend. By proper design the specimen would delaminate and not use excessive material or load. A simple analysis for the optimum adherend thickness and experimental verification are included.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Journal of Composites Technology and Research (ISSN 0885-6804); 8; 58-60
    Format: text
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  • 5
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    Postbuckling analysis using a general-purpose code (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: AIAA Journal (ISSN 0001-1452); 24; 1013-102
    Format: text
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  • 6
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    References and conference proceedings towards the understanding of fracture mechanics (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: A list of books, reports, periodicals, and conference proceedings, as well as individual papers, centered on specific aspects of fracture phenomenon has been compiled by the ASTM Committee E-24 on Fracture Testing. A list of basic references includes the articles on the development of fracture toughness, evaluation of stress intensity factors, fatigue crack growth, fracture testing, fracture of brittle materials, and fractography. Special attention is given to the references on application of fracture mechanics to new designs and on reevaluation of failed designs, many of them concerned with naval and aircraft structures.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: Journal of Testing and Evaluation (ISSN 0090-3973); 14; 61-75
    Format: text
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  • 7
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    A comparison of NASTRAN (Cosmic) and experimental results for the vibration of thick open cylindrical cantilevered shells (1986)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The natural frequencies and associated mode shapes for three thick open cantilevered cylindrical shells were determined both numerically and experimentally. The shells ranged in size from moderately to very thick with length to thickness ratios of 16, 8 and 5.6, the independent dimension being the shell thickness. The shell geometry is characterized by a circumferential angle of the 142 degrees and a ratio of length to inner radii arc length near 1.0. The finite element analysis was performed using NASTRAN's (COSMIC) triangular plate bending element CTRIA2, which includes membrane effects. The experimental results were obtained through holographic interferometry which enables one to determine the resonant frequencies as well as mode shapes from photographs of time-averaged holograms.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: COSMIC 14th NASTRAN (R) Users' Colloquium; p 187-204
    Format: application/pdf
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  • 8
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    NASTRAN interfacing modules within the Integrated Analysis Capability (IAC) Program (1986)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The IAC program provides the framework required for the development of an extensive multidisciplinary analysis capability. Several NASTRAN related capabilities were developed which can all be expanded in a routine manner to meet in-house unique needs. Plans are to complete the work discussed herein and to provide it to the engineering community through COSMIC. Release is to be after the current IAC Level 2 contract work on the IAC executive system is completed and meshed with the interfacing modules and analysis capabilities under development at the GSFC.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: COSMIC 14th NASTRAN (R) Users' Colloquium; p 103-129
    Format: application/pdf
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  • 9
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    Dynamic and aeroelastic analyses of turbosystems in NASTRAN (1986)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Several new capabilities dealing with the dynamic and aeroelastic analyses of turbosystems have been added as standard features to the April 1986 release of NASTRAN. A brief description is given of these capabilities and their implementation in NASTRAN are outlined.
    Schlagwort(e): STRUCTURAL MECHANICS
    Materialart: COSMIC 14th NASTRAN (R) Users' Colloquium; p 56-60
    Format: application/pdf
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  • 10
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    Case histories involving fatigue and fracture mechanics; Proceedings of the Symposium, Charleston, SC, Mar. 21, 22, 1985 (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2016-03-09
    Beschreibung: Papers are presented on cracking at nozzle corners in the nuclear pressure vessel industry, applied fracture mechanics for assessing defect significance in a crude oil pipeline, failure analysis of a large wind-tunnel compressor blade, analysis of a compressor-wheel failure, and preventing fracture by inspection and analysis. Consideration is also given to the fatigue crack growth predictions of welded aircraft structures containing flaws in the residual stress field, the fatigue and fracture mechanics analysis of a compression loaded aircraft structure, fracture of an aircraft horizontal stabilizer, fatigue life analysis of fuel tank skins under combined loads, and aircraft structural maintenance recommendations based on fracture mechanics analysis. Additional papers discuss an analysis of two metal-forming die failures, an analysis of a failed saw arbor, and the role of fracture mechanics in assessing the effect on fatigue life of design changes in welded fabrications.
    Schlagwort(e): STRUCTURAL MECHANICS
    Format: text
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