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  • STRUCTURAL MECHANICS  (397)
  • 2020-2024
  • 1985-1989  (176)
  • 1965-1969  (220)
  • 1955-1959  (1)
  • 1
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    Study of Apollo water impact. Volume 8 - Unsymmetric shells of revolution analysis Final report (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Numerical analysis of static, and dynamic shell response to water impact loads
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-92024 , SID-67-498, V. 8
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  • 2
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    The analysis of shells of revolution having arbitrary stiffness distributions. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Shells of revolution having arbitrary stiffness distribution of loads and temperatures
    Keywords: STRUCTURAL MECHANICS
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  • 3
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    Stress state of a plane weakened by a broken-line crack (1967)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Critical load for crack propagation due to tension forces in plane weakened by broken-line crack
    Keywords: STRUCTURAL MECHANICS
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  • 4
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    Dynamics of flexible bodies in tree topology - A computer-oriented approach (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 8; 584-590
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  • 5
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    Constraint elimination in dynamical systems (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Large space structures (LSSs) and other dynamical systems of current interest are often extremely complex assemblies of rigid and flexible bodies subjected to kinematical constraints. A formulation is presented for the governing equations of constrained multibody systems via the application of singular value decomposition (SVD). The resulting equations of motion are shown to be of minimum dimension.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Langley Research Center, Computational Methods for Structural Mechanics and Dynamics; p 537-541
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  • 6
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    Thermomechanical characterization of Hastelloy-X under uniaxial cyclic loading (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: 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.
    Keywords: STRUCTURAL MECHANICS
    Type: Turbine Engine Hot Section Technology 1986; p 293-305
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  • 7
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    An automated procedure for material parameter evaluation for viscoplastic constitutive models (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An automated procedure is presented for evaluating the material parameters in Walker's exponential viscoplastic constitutive model for metals at elevated temperature. Both physical and numerical approximations are utilized to compute the constants for Inconel 718 at 1100 F. When intermediate results are carefully scrutinized and engineering judgement applied, parameters may be computed which yield stress output histories that are in agreement with experimental results. A qualitative assessment of the theta-plot method for predicting the limiting value of stress is also presented. The procedure may also be used as a basis to develop evaluation schemes for other viscoplastic constitutive theories of this type.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center, Nonlinear Constitutive Relations for High Temperature Applications, 1986; p 317-352
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  • 8
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    An experimental comparison of several current viscoplastic constitutive models at elevated temperature (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Four current viscoplastic models are compared experimentally for Inconel 718 at 593 C. This material system responds with apparent negative strain rate sensitivity, undergoes cyclic work softening, and is susceptible to low cycle fatigue. A series of tests were performed to create a data base from which to evaluate material constants. A method to evaluate the constants is developed which draws on common assumptions for this type of material, recent advances by other researchers, and iterative techniques. A complex history test, not used in calculating the constants, is then used to compare the predictive capabilities of the models. The combination of exponentially based inelastic strain rate equations and dynamic recovery is shown to model this material system with the greatest success. The method of constant calculation developed was successfully applied to the complex material response encountered. Backstress measuring tests were found to be invaluable and to warrant further development.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center, Nonlinear Constitutive Relations for High Temperature Applications, 1986; p 253-289
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  • 9
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    Numerical synthesis of tri-variate velocity realizations of turbulence (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An approach for synthesizing trivariate turbulence velocity field spatial realizations is presented. Some of the spatial frequency characteristics of the random velocity field are described by the von Karman spectrum. The simulation algorithm is based on an efficient autoregressive-moving average (ARMA) scheme involving coefficient square matrices of order three. The determination of the efficient low order ARMA algorithm is preceded by the determination of a suitable high order autoregressive (AR) simulation algorithm. The numerical results are presented in a dimensionless form. Thus, they are applicable for any scale of turbulence.
    Keywords: STRUCTURAL MECHANICS
    Format: text
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  • 10
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    Cryogenic insulation strength and bond tester (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method and apparatus for testing the tensile strength and bonding strength of sprayed-on foam insulation attached to metal cryogenic fuel tanks is described. A circular cutter is used to cut the insulation down to the surface of the metal tank to form plugs of the insulation for testing in situ on the tank. The apparatus comprises an electromechanical pulling device powered by a belt battery pack. The pulling device comprises a motor driving a mechanical pulling structure comprising a horizontal shaft connected to two bell cracks which are connected to a central member. When the lower end of member is attached to a fitting, which in turn is bonded to a plug, a pulling force is exerted on the plug sufficient to rupture it. The force necessary to rupture the plug or pull it loose is displayed as a digital read-out.
    Keywords: STRUCTURAL MECHANICS
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