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  • 1
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    Comparison of Fatigue Cycle Identification Methods (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Structural Mechanics
    Type: NF1676L-21154 , International Conference on Engineering Vibration; Sep 07, 2015 - Sep 10, 2015; Ljublijana; Slovenia
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  • 2
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    A Comparison of PSD Enveloping Methods for Nonstationary Vibration (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There is a need to derive a power spectral density (PSD) envelope for nonstationary acceleration time histories, including launch vehicle data, so that components can be designed and tested accordingly. This paper presents the results of the three methods for an actual flight accelerometer record. Guidelines are given for the application of each method to nonstationary data. The method can be extended to other scenarios, including transportation vibration.
    Keywords: Instrumentation and Photography
    Type: NF1676L-23727 , ESTECH 2016 Annual Technical Meeting and Exposition; May 02, 2016 - May 05, 2016; Glendale, AZ; United States
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  • 3
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    Seismic Analysis and Testing of Launch Vehicles and Equipment Using Historical Strong Motion Data Scaled to Satisfy Shock Response Spectra Specifications (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Geophysics; Structural Mechanics
    Type: NF1676L-21153 , Spacecraft and Launch Vehicle Dynamic Environments Workshop (SCLV 2015); Jun 02, 2015 - Jun 04, 2015; El Segundo, CA; United States
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  • 4
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    Modified Spectral Fatigue Methods for S-N Curves With MIL-HDBK-5J Coefficients (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The rainflow method is used for counting fatigue cycles from a stress response time history, where the fatigue cycles are stress-reversals. The rainflow method allows the application of Palmgren-Miner's rule in order to assess the fatigue life of a structure subject to complex loading. The fatigue damage may also be calculated from a stress response power spectral density (PSD) using the semi-empirical Dirlik, Single Moment, Zhao-Baker and other spectral methods. These methods effectively assume that the PSD has a corresponding time history which is stationary with a normal distribution. This paper shows how the probability density function for rainflow stress cycles can be extracted from each of the spectral methods. This extraction allows for the application of the MIL-HDBK-5J fatigue coefficients in the cumulative damage summation. A numerical example is given in this paper for the stress response of a beam undergoing random base excitation, where the excitation is applied separately by a time history and by its corresponding PSD. The fatigue calculation is performed in the time domain, as well as in the frequency domain via the modified spectral methods. The result comparison shows that the modified spectral methods give comparable results to the time domain rainflow counting method.
    Keywords: Structural Mechanics
    Type: NF1676L-25047 , European Conference on Spacecraft Structures, Materials and Environmental Testing (ECSSMET) 2016; Sep 27, 2016 - Sep 30, 2016; Toulouse; France
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  • 5
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    A Review of Spectral Methods for Variable Amplitude Fatigue Prediction and New Results (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A comprehensive review of the available methods for estimating fatigue damage from variable amplitude loading is presented. The dependence of fatigue damage accumulation on power spectral density (psd) is investigated for random processes relevant to real structures such as in offshore or aerospace applications. Beginning with the Rayleigh (or narrow band) approximation, attempts at improved approximations or corrections to the Rayleigh approximation are examined by comparison to rainflow analysis of time histories simulated from psd functions representative of simple theoretical and real world applications. Spectral methods investigated include corrections by Wirsching and Light, Ortiz and Chen, the Dirlik formula, and the Single-Moment method, among other more recent proposed methods. Good agreement is obtained between the spectral methods and the time-domain rainflow identification for most cases, with some limitations. Guidelines are given for using the several spectral methods to increase confidence in the damage estimate.
    Keywords: Structural Mechanics
    Type: NF1676L-19432 , International Conference on Material and Component Performance under Variable Amplitude Loading (VAL2015); Mar 23, 2015 - Mar 26, 2015; Prague; Czechoslovakia
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