The Hydraulic Effect On Cracks In Rails

• Main Author: 郭光凱
• Other Authors: 褚晴暉
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/41194944495561538746

碩士 === 國立成功大學 === 機械工程學系 === 85 === The pitting phenomenon occurs on rail surface is a major factor cause failure. From the previous extensive research works, the hydraulic pressure induced inside the surface cracks, such as transverse cracks, tache ovale cracks and squat cracks, plays an important role in discussing the crack instability due to pitting. In this paper, the hydraulic effect on surface cracks in rails are estimated by means of calculating the stress intensity factor and applying the strain energy density theory under the two- dimensional finite element analysis. The results show that hydraulic effect significantly reduce the fatigue life of the cracked rail than no hydraulic effect case. The behaviors of the surface cracks with hydraulic pressure are different from these without hydraulic pressure.