关键词: 螺栓, 表面裂纹, 应力强度因子, 疲劳试验, 断裂力学, 螺纹要素

Abstract:

The stress intensity factors(SIFs)- K are investigated for surface cracks in the thread ground of 30CrMnSiA bolts used in aircraft structure on the basis of the simulated experiments.According to the SIF research achievements obtained of the thread fastener,the epuations for the SIF- K are devdloped by means of analogy for surface cracks in the thread ground of bolts under the condition of well-considered thread elements.Experments are conducted to study the influence of the thread on fracture mechanics features of the structure member.The SIFs are compared between the analytical solution and experimental results.It is shown that good agreement is achieved between the experimental results and analytical solution evaluated using the SIFs' epuation derived by the author.

Key words: bolt, surface crack, stress intensity factor, fatigue test, fracture mechanics, thread elements