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  • 1
    Electronic Resource
    Electronic Resource
    Relaxation of Residual Stresses in and around Mechanical Fasteners Due to Fatigue Loading (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 153-158 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The residual stresses around clearance-fit mechanical fasteners have been found to besimilar to those around cold expanded holes where compressive hoop stresses close to the fastenerhole are balanced by far-field tensile stresses. This compressive zone has been shown to prolongfatigue lifetimes around fastener holes. Constant amplitude fatigue loading was applied to singleplate rivet specimens for varying numbers of cycles to investigate the redistribution of these stressesafter fatiguing. Synchrotron diffraction was used to map the evolution of the residual stressesaround the rivets. Little change in the hoop stress local to the rivets occurred until visible fatiguecracks were observed suggesting that relaxation of these stresses is due to the cracks rather thantheir cause
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.153.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Measuring and Predicting the Effects of Residual Stresses on Crack Propagation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 524-525 (Sept. 2006), p. 77-82 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This article presents the first part of a study on the interaction between residual stresses and crackdriving force. Blunt notched CT specimens were pre-strained to introduce residual stresses at thenotch, where a crack is subsequently introduced. FE modelling is used to model the specimen preloadand pre-cracking. Modelling predictions are validated by two different methods. The totalpredicted surface residual strains are compared to image correlation measurements. The predictedresidual strains were measured using neutron diffraction, both before and after fatigue cracking. Theresidual strain profiles show good agreement with the 3D FE model in the far field but the peak strainsmeasured near the notch are smaller those predicted. This is a result of the low spatial resolution ofthe technique
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.77.pdf
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    Paper (German National Licenses)
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  • 3
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    A scheme for theoretical and experimental evaluation of multivariable system stability robustness (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A scheme for theoretical and experimental evaluation of multivariable system stability robustness measures is described. The experimental scheme is based on the estimation of frequency responses from power-spectra analyses of a set of time responses due to sine-sweep excitation at each input and then computation of the appropriate singular values. The procedure can also be used on an open-loop stable system to predict the closed-loop stability before closing the loop. Classical Nyquist diagrams can also be constructed to determine one-loop-at-a-time gain or phase margins. The scheme has been implemented in a wind tunnel test for singular-value evaluation of digital flutter suppression control laws and compared with theory. The singular values at the plant input and output of the actual system and the theoretical model are qualitatively similar but have some discrepancies.
    Keywords: CYBERNETICS
    Format: text
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    NASA TECHNICAL REPORTS
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