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  • 1
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    Probabilistic fracture finite elements (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Probabilistic Fracture Mechanics (PFM) is a promising method for estimating the fatigue life and inspection cycles for mechanical and structural components. The Probability Finite Element Method (PFEM), which is based on second moment analysis, has proved to be a promising, practical approach to handle problems with uncertainties. As the PFEM provides a powerful computational tool to determine first and second moment of random parameters, the second moment reliability method can be easily combined with PFEM to obtain measures of the reliability of the structural system. The method is also being applied to fatigue crack growth. Uncertainties in the material properties of advanced materials such as polycrystalline alloys, ceramics, and composites are commonly observed from experimental tests. This is mainly attributed to intrinsic microcracks, which are randomly distributed as a result of the applied load and the residual stress.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center, Structural Integrity and Durability of Reusable Space Propulsion Systems; p 137-144
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  • 2
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    Probabilistic finite elements for fracture and fatigue analysis (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The fusion of the probabilistic finite element method (PFEM) and reliability analysis for probabilistic fracture mechanics (PFM) is presented. A comprehensive method for determining the probability of fatigue failure for curved crack growth was developed. The criterion for failure or performance function is stated as: the fatigue life of a component must exceed the service life of the component; otherwise failure will occur. An enriched element that has the near-crack-tip singular strain field embedded in the element is used to formulate the equilibrium equation and solve for the stress intensity factors at the crack-tip. Performance and accuracy of the method is demonstrated on a classical mode 1 fatigue problem.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Lewis Research Center, Structural Integrity and Durability of Reusable Space Propulsion Systems; p 181-195
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  • 3
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    Unconditionally stable implicit-explicit algorithms for coupled thermal stress waves (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An unconditionally stable implicit-explicit method is proposed for the analysis of transient coupled thermal stress waves, and the computer-implementation aspects of the method are discussed. In the method proposed here, the mechanical displacement and temperature are used as independent variables. The resulting coupled finite element matrix equations are symmetric.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 17; 3, 19; 1983
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  • 4
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    Monitoring ocean surface wind vector from space (2001)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Talks about how spaceborne scatterometers are the only proven mean to measure ocean surface wind vector.
    Keywords: Geophysics
    Type: American Geophysical Union Fall Meeting; San Francisco, CA; United States
    Format: text
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  • 5
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    Improving NSCAT Winds for Tropical Cyclones (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: There has been a question on whether it is possible to measure the surface wind speeds of tropical cyclones with a spaceborne Ku-band scatterometer.
    Keywords: Geophysics
    Type: Journal of Geophysical Research-Ocean
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  • 6
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    CO2 exchange coefficients from remotely-sensed wind speed measurements: SSM/I versus QuikSCAT in 2000 (2002)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: We compare here the air-sea exchange coefficient for C02 estimated with monthly mean wind speed measured by the Special Sensing Microwave Imager (SSM/I), Ks , and by the scatterometer QuikSCAT, Kq, for the year 2000.
    Keywords: Geophysics
    Type: Geophysical Research Letters
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  • 7
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    Finite elements for contact problems in two-dimensional elastodynamics (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A finite element approach for contact problems in two dimensional elastodynamics was proposed. Sticking, sliding, and frictional contact were taken into account. The method consisted of a modification of the shape functions, in the contact region, in order to involve the nodes of the contacting body. The formulation was symmetric (both bodies were contactors and targets), in order to avoid interpenetration. Compatibility over the interfaces was satisfied. The method was applied to the impact of a block on a rigid target. It is shown that the formulation can be applied to fluid structure interaction, and to problems involving material nonlinearity.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center Res. in Nonlinear Struct. and Solid Mech.; p 225-235
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  • 8
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    A Comparison of NASA Scatterometer and ECMWF Winds and their Oceanic Response Over the North Atlantic (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Wind taken from the National Aeronautics and Space Administration (NASA) scatterometer (NSCAT) is compared with the operational analysis from European Center for Medium-Range Forecast (ECMWF) for the entire duration (about 9 months) of the NSCAT mission.
    Keywords: Geophysics
    Type: Geophysical Research Letters
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  • 9
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    Annual Variation of the Arabian Sea and South China Sea in Response to Monsoons (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Geophysics
    Type: Western Pacific Geophysics Meeting; Taipei, Taiwan; Republic of China
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  • 10
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    Importance of Salinity Measurements in the Heat Storage Estimation from Topex/Poseidon (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Sea surface height anomaly signals from satellite altimeter data are used to estimate heat storage. Since variability in sea surface height is mostly due to expansion and contraction of the water column it can be correlated with variations in the heat and salt content.
    Keywords: Geophysics
    Type: Geophysical Research Letters
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