The contours of stress,strain and the positions of stress concentration in one cycle,during which the pressure varies from 4MPa to 31.5 MPa at the frequency of 100 cycle/min,are obtained.

• 得到了缸体内压按100次/分的频率在4~31.；5 MPa之间变化时一个周期内的应力分布云图及应力集中位置。