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  • Other Sources  (1,861)
  • STRUCTURAL MECHANICS  (1,861)
  • 1
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    An evaluation of the pressure proof test concept for 2024-T3 aluminium alloy sheet (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The concept of pressure proof testing of fuselage structures with fatigue cracks to insure structural integrity was evaluated from a fracture mechanics viewpoint. A generic analytical and experimental investigation was conducted on uniaxially loaded flat panels with crack configurations and stress levels typical of longitudinal lap splice joints in commercial transport aircraft fuselages. The results revealed that the remaining fatigue life after a proof cycle was longer than that without the proof cycle because of crack growth retardation due to increased crack closure. However, based on a crack length that is slightly less than the critical value at the maximum proof stress, the minimum assured life or proof test interval must be no more than 550 pressure cycles for a 1.33 proof factor and 1530 pressure cycles for a 1.5 proof factor to prevent in-flight failures.
    Keywords: STRUCTURAL MECHANICS
    Type: In: Structural integrity of aging airplanes (A93-45772 19-01); p. 115-129.
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  • 2
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    The research background of the telstar experiment (1963)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Research background of telstar experiment
    Keywords: STRUCTURAL MECHANICS
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  • 3
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    Probabilistic evaluation of uncertainties and risks in aerospace components (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: A methodology is presented for the computational simulation of primitive variable uncertainties, and attention is given to the simulation of specific aerospace components. Specific examples treated encompass a probabilistic material behavior model, as well as static, dynamic, and fatigue/damage analyses of a turbine blade in a mistuned bladed rotor in the SSME turbopumps. An account is given of the use of the NESSES probabilistic FEM analysis CFD code.
    Keywords: STRUCTURAL MECHANICS
    Type: In: Computational nonlinear mechanics in aerospace engineering (A93-12151 02-31); p. 365-415.
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  • 4
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    Finite element large-amplitude free and forced vibrations of rectangular thin composite plates (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A finite element formulation is presented for determining the large-amplitude free and steady-state forced vibration response of arbitrarily laminated anisotropic composite rectangular thin plates. The nonlinear stiffness and harmonic force matrices of an arbitrarily laminated composite rectangular plate element are developed for nonlinear free and forced vibration analyses. The linearized updated-mode method with nonlinear time function approximation is employed for the solution of the system nonlinear eigenvalue equations. The amplitude-frequency relations for convergence with gridwork refinement, different boundary conditions, aspect ratios, lamination angles and number of plies are presented. The finite element results are compared with available approximate continuum solutions.
    Keywords: STRUCTURAL MECHANICS
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  • 5
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    Internal fracture caused by focusing of explosive waves. (1966)
    In:  Other Sources
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    Publication Date: 2011-08-11
    Description: Internal fracture of spheroids caused by focusing explosive waves
    Keywords: STRUCTURAL MECHANICS
    Type: JOURNAL OF APPLIED PHYSICS
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  • 6
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    Direct Transient Analysis of a Fuze Assembly by Axisymmetric Solid Elements (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A fuze assembly, which consists of three major parts, nose, collar and sleeve, was designed to survive severe transverse impact giving a maximum base acceleration of 20.000 G. It is shown that hoop failure occurred in the collar after the impact. They also showed that by bonding the collar to the nose, the collar was able to survive the same impact. To find out the effectiveness of the bonding quantitatively, axisymmetric solid elements TRAPAX and TRIAAX were used in modelling the fuze and direct transient analysis was performed. The dynamic stresses in selected elements on the bonded and unbonded collars were compared. The peak hoop stresses in the unbonded collar were found to be up to three times higher than those in the bonded collar. The NASTRAN results explained the observed hoop failure in the unbonded collar. In addition, static and eigenvalue runs were performed as checks on the models prior to the transient runs. The use of the MPCAX cards and the existence and contributors of the calculated first several nearly identical natural frequencies are addressed.
    Keywords: STRUCTURAL MECHANICS
    Type: COSMIC 13th NASTRAN (R) Users' Colloq.; p 431-452
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  • 7
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    A semi-implicit dynamic relaxation algorithm for static nonlinear structural analysis (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A semiimplicit dynamic relaxation technique for solution of the nonlinear structural equlibrium equation is presented. A previously presented basic transient response analysis algorithm is employed, permitting use of one solution method and one software module for both static and dynamic analyses. A theoretical comparison of the method with explicit dynamic relaxation techniques shows that it offers a substantially improved convergence property without additional computational overhead.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Res. in Struct. and Solid Mech., 1982; p 1-10
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  • 8
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    Probabilistic structural analysis methods for space transportation propulsion systems (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Information on probabilistic structural analysis methods for space propulsion systems is given in viewgraph form. Information is given on deterministic certification methods, probability of failure, component response analysis, stress responses for 2nd stage turbine blades, Space Shuttle Main Engine (SSME) structural durability, and program plans. .
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, Washington, Space Transportation Propulsion Technology Symposium. Volume 3: Panel Session Summaries and Presentations; p 895-914
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  • 9
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    Development and application of a unified balancing approach with multiple constraints (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The development of a general analytic approach to constrained balancing that is consistent with past influence coefficient methods is described. The approach uses Lagrange multipliers to impose orbit and/or weight constraints; these constraints are combined with the least squares minimization process to provide a set of coupled equations that result in a single solution form for determining correction weights. Proper selection of constraints results in the capability to: (1) balance higher speeds without disturbing previously balanced modes, thru the use of modal trial weight sets; (2) balance off-critical speeds; and (3) balance decoupled modes by use of a single balance plane. If no constraints are imposed, this solution form reduces to the general weighted least squares influence coefficient method. A test facility used to examine the use of the general constrained balancing procedure and application of modal trial weight ratios is also described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Marshall Space Flight Center Advan. High Pressure O2(H2 Technol.; p 381-399
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  • 10
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    On internal fracture of solids. (1966)
    In:  Other Sources
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    Publication Date: 2018-12-01
    Description: Internal fracture of solids analyzing initiation by converging tensile pulses in prolate spheroid and crack propagation in infinite solid
    Keywords: STRUCTURAL MECHANICS
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