有效阻止裂纹扩展的一种新方法

A New Method to Effectively Prevent from Crack Expansion

当外加应力强度因子变化幅度低于材料的疲劳裂纹扩展门槛值时,裂纹不会产生和发展,疲劳损伤几乎不能产生。裂纹尖端韧化区止裂工艺提高了裂纹尖端局部区域材料的疲劳裂纹扩展门槛值,减慢了疲劳裂纹扩展速率,使裂纹扩展寿命大为延长。

When the external strain factor changing factor is less than the threshold value for the material fatigue crack expansion,the crack will not generate or expand. The fatigue damage strengthening method increases the threshold value of crack expansion at the crack sion speed of fatigue crack,and extends the life time of fatigue crack. can be avoided. Crack end end area, lowers the expansion speed of fatigue crack,and extends the life time of fatigue crack.