Stress Analysis and Life Prediction of the VL Sealing Structure in Wide Temperature Ranges
The VL sealing structure model was established to investigate stress distribution under different temperature conditions.Basing on analyzing Miner damage mechanism and being directed by the fatigue cumulative damage theory,the fatigue life variation law and fatigue life status of both O-ring and L-ring which boasting of VL sealing structure under different temperature conditions were studied.The results show that,with the increase of temperature,the Mises stress of O-ring doesn't change much,and the fa-tigue life first increases and then decreases.When the temperature stays at 25℃,the fatigue life at the danger point becomes maximum,which is 7.341×107 times.The Mises stress of the L-ring gradually de-creases from 60.19 MPa to 26.38 MPa and the position shifts to the inner wall from the bottom,and finally reaches the inner part of the L-ring and the minimum fatigue life is 2.21×105 times.In addition,in the low temperature environment,the minimum fatigue life of L-ring becomes small,but the average fatigue life becomes large.In the high temperature environment,the minimum fatigue life of the L-ring is larger while the average fatigue life becomes smaller.
VL sealing structurewide temperature rangefatigue cumulative damage theory
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