TECHNIQUE OF FATIGUE STRENGTH ESTIMATION FOR MECHANICAL STRUCTURE PARTS UNDER MULTI-STAGE RANDOM VIBRATIONAL LOAD
N. A. Bilyk, T. N. Artem'eva
VANT. Ser.: Mat. Mod. Fiz. Proc 2014. Вып.2. С. 36-44.
The paper describes the method and the algorithm of fatigue strength estimation for mechanical structure parts under multi-stage random vibration with random spectrum. The acting load is determined at the piece mounting points or on the unsafe cross-section of the part. The method allows the estimation of the part fatigue breakdown probability, the level of cumulative damage at each load stage and for the whole loading period, the mean value and the root-mean-square deviation of the part life-time logarithm. The program complex realizing this approach has been created for an AWP. The fatigue strength and the strength reliability were calculated for copper and steel piping under the impact of three-stage random vibration at the piece mounting points. The proposed approach is able to decrease the cost of designing and mechanical structures development, and to reduce the duration of preproduction efforts.Keywords: random vibration, multi-stage random vibration, part life-time, level of cumulative damage, reliability index.
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