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  • 1
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    Frequency domain stress intensity calibration of damped cracked panels (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper discusses two schemes for doing finite element K calibration in the frequency domain. The baseline scheme uses the definition of K as a limit toward the crack tip. The limiting process requires using a very fine mesh around the crack tip making the scheme computationally very expensive. It is shown that the behavior of K as a function of frequency is very similar to a modal response. Taking advantage of this, a more efficient scheme involves a modal analysis of the cracked sheet and scaling the response to that of the static stress intensity. In this way, only a static K calibration need be performed. All the examples shown are for a frequency range spanning multiple resonances and with two levels of damping.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal of Fracture (ISSN 0376-9429); 61; 2; p. 123-130.
    Format: text
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  • 2
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    Dynamic fracture mechanics analysis for an edge delamination crack (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A global/local analysis is applied to the problem of a panel with an edge delamination crack subject to an impulse loading to ascertain the dynamic J integral. The approach uses the spectral element method to obtain the global dynamic response and local resultants to obtain the J integral. The variation of J integral along the crack front is shown. The crack behavior is mixed mode (Mode 2 and Mode 3), but is dominated by the Mode 2 behavior.
    Keywords: ACOUSTICS
    Type: NASA-TM-109106 , NAS 1.15:109106 , International Conference on Recent Advances in Structural Dynamics; Jul 18, 1994 - Jul 21, 1994; Southampton; United Kingdom
    Format: application/pdf
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  • 3
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    Application of the Spectral Element Method to Acoustic Radiation (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This report summarizes research to develop a capability for analysis of interior noise in enclosed structures when acoustically excited by an external random source. Of particular interest was the application to the study of noise and vibration transmission in thin-walled structures as typified by aircraft fuselages. Three related topics are focused upon. The first concerns the development of a curved frame spectral element, the second shows how the spectral element method for wave propagation in folded plate structures is extended to problems involving curved segmented plates. These are of significance because by combining these curved spectral elements with previously presented flat spectral elements, the dynamic response of geometrically complex structures can be determined. The third topic shows how spectral elements, which incorporate the effect of fluid loading on the structure, are developed for analyzing acoustic radiation from dynamically loaded extended plates.
    Keywords: Acoustics
    Type: NASA/CR-2000-210642 , NAS 1.26:210642
    Format: application/pdf
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  • 4
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    Frequency domain analysis of the random loading of cracked panels (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The primary effort concerned the development of analytical methods for the accurate prediction of the effect of random loading on a panel with a crack. Of particular concern was the influence of frequency on the stress intensity factor behavior. Many modern structures, such as those found in advanced aircraft, are lightweight and susceptible to critical vibrations, and consequently dynamic response plays a very important role in their analysis. The presence of flaws and cracks can have catastrophic consequences. The stress intensity factor, K, emerges as a very significant parameter that characterizes the crack behavior. In analyzing the dynamic response of panels that contain cracks, the finite element method is used, but because this type of problem is inherently computationally intensive, a number of ways of calculating K more efficiently are explored.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-196021 , NAS 1.26:196021
    Format: application/pdf
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  • 5
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    Application of the Spectral Element Method to Interior Noise Problems (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The primary effort of this research project was focused the development of analytical methods for the accurate prediction of structural acoustic noise and response. Of particular interest was the development of curved frame and shell spectral elements for the efficient computational of structural response and of schemes to match this to the surrounding fluid.
    Keywords: Acoustics
    Format: application/pdf
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