双头螺柱断裂分析

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风力发电机齿轮箱使用M30×280双头螺柱固定.安装过程中,常常在扭力还没有达到额定扭矩时便发生螺杆部分断裂.采用宏观断口观察、化学成分分析、扫描电镜断口观察和显微组织检验等方法,对断裂的双头螺柱进行了分析.结果表明：双头螺柱断裂的原因是由于螺柱原材料中存在横向裂纹,在安装过程中裂纹在拉应力的作用下扩展,以致发生断裂.

The gearbox of wind generator is fixed by M30 x 280 studs. During the fixing procedure ,its screw is cracked when the mounting torque dese not come up to the rated torque.The Macroscopic analysis, chemical composition analysis, SEM observation and metallographic examination are used to analyze the fractured stud bolt. The results indicate that its fracture is caused by the ex- tension of the pre-existing horizontal crack when the bolt is under a tensile stress during the fixing procedure.

裂纹，风电齿轮箱，双头螺柱，crack，wind power gearbox，stud bolt。

双头螺柱断裂分析。