Frequency-dependent random fatigue of panel-type structures made of ceramic matrix composites

【Author】

Yadong Zhou;Xiaochen Hang;Shaoqing Wu;Qingguo Fei;Natasa Trisovic;Department of Engineering Mechanics,Southeast University;Department of Civil and Environmental Engineering and Department of Mechanical Engineering,Northwestern University;Department of Aerospace Engineering and Mechanics,University of Alabama;School of Mechanical Engineering,Southeast University;Faculty of Mechanical Engineering,Department of Mechanics,University of Belgrade;

【Institution】

Department of Engineering Mechanics,Southeast University;Department of Civil and Environmental Engineering and Department of Mechanical Engineering,Northwestern University;Department of Aerospace Engineering and Mechanics,University of Alabama;School of Mechanical Engineering,Southeast University;Faculty of Mechanical Engineering,Department of Mechanics,University of Belgrade;

【Abstract】

The panel-type structures used in aerospace engineering can be subjected to severe highfrequency acoustic loadings in service. This paper evaluates the frequency-dependent random fatigue of panel-type structures made of ceramic matrix composites(CMCs) under acoustic loadings. Firstly, the high-frequency random responses from the broadband random excitation will result in more stress cycles in a deinite period of time. The probability density distributions of stress amplitudes will be different in different frequency bandwidths, though the peak stress estimations are identical. Secondly, the fatigue properties of CMCs can be highly frequency-dependent. The fatigue evaluation method for the random vibration case is adopted to evaluate the fatigue damage of a representative stiffened panel structure. The frequency effect through S-N curves on random fatigue damage is numerically veriied. Finally, a parameter is demonstrated to characterize the mean vibration frequency of a random process, and hence this parameter can further be considered as a reasonable loading frequency in the fatigue tests of CMCs to obtain more reliable S-N curves.Therefore, the inluence of vibration frequency can be incorporated in the random fatigue model from the two perspectives.

【Keywords】

Random fatigue;;Frequency effect;;Ceramic matrix composites(CMCs);;S-N curve;;Loading frequency

References

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Total: 34 articles

  • [1] Wei Li;Yueming Li;State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University;, VIBRATION AND SOUND RADIATION OF AN ASYMMETRIC LAMINATED PLATE IN THERMAL ENVIRONMENTS, Acta Mechanica Solida Sinica, 2015 (01)
  • [2] Yadong Zhou;Shaoqing Wu;Zhiyong Tan;Qingguo Fei;Department of Engineering Mechanics, Southeast University;Jiangsu Key Laboratory of Engineering Mechanics, Southeast University;State Key Laboratory of Space Physics;, Temperature-dependence of acoustic fatigue life for thermal protection structures, Theoretical & Applied Mechanics Letters, 2014 (02)
  • [3] GENG Qian;WANG Di;LIU Yuan;LI YueMing;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi'an Jiaotong University;, Experimental and numerical investigations on dynamic and acoustic responses of a thermal post-buckled plate, Science China(Technological Sciences), 2015 (08)
  • [4] Seung-Ho Han;;Dae-Gyun An;;Seong-Jong Kwak;;Ki-Weon Kang, Vibration fatigue analysis for multi-point spot-welded joints based on frequency response changes due to fatigue damage accumulation, International Journal of Fatigue, 2012

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