Stress Concentration Numerical Analysis of a Panel with Big Grooves

To improve the fatigue life of a panel with grooves, the stress relief groove is added after machining the tangent round transition structure. The purpose of this method is to reduce the stress concentration at the edges of rounded transition structure in the present study. To confirm the effectiveness of the method, analyses were performed by using software for two-dimensional elastic problems based on the body-force method. The calculation results show that the existence of stress relief grooves further reduced the stress concentration at the edges of rounded transition structure. A close distance between two stress relief grooves results in little influence on stress concentration at the edge of rounded transition structure and much stress reduction at the edge of stress relief grooves. Also, a lower stress concentration was obtained by increasing the diameter and numbers of stress relief grooves. Results prove the effectiveness and certain engineering practicability of this method. The method is helpful for structure design.