Crack Stress Intensity Factor Analysis of Spherical Pressure Vessels
In order to investigate the effect of initial crack angle on the stress intensity factor of a bimaterial spherical pressure vessel,N6-Q345 bimaterial spherical pressure vessel was taken as the research object.By establishing a finite element model for numerical simulation,different initial crack angles of N vessel were simulated,and the stress intensity factor was calculated using the interaction integration method.The results show that the Type Ⅰ and Type Ⅱ stress intensity factors of cracks increase with the increase of the initial angle of the crack,but the Type Ⅱ stress intensity factor reaches its maximum value at an initial angle of 45 °,and decreases when it exceeds 45 °;The stress intensity factor at the crack tip on the high-strength Q345 material side should always be higher than that on the low-strength N6 material side;The J-integral and equivalent stress intensity factor will increase with the increase of the initial angle,but the Type Ⅰ stress intensity factor dominates,and cracks are more likely to propagate towards the interface side of high-strength materials(Q345).
spherical pressure vesselcrackingstress intensity factorcomposite material
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