薄板孔边挤压强化对低循环疲劳寿命影响的试验  

Low cycle fatigue life experiment of sheet metal with coldworking hole

作　　者：杨兴宇[1] 王逾涯[1] 董立伟[1] 孟祥明[1] 脱伟[1] 

机构地区：[1]北京航空工程技术研究中心,北京100076

出　　处：《航空动力学报》2011年第6期1257-1265,共9页Journal of Aerospace Power

摘　　要：为提高某压气机封严篦齿盘均压孔的疲劳强度,根据均压孔的具体结构形式,设计了三种冷挤压强化方法:单侧多次挤压法、柱形头挤压法和T形头挤压法.用两种材料(不锈钢1Cr11Ni2W2MoV和镍基高温合金ЗП742)设计加工了低循环疲劳薄板有孔模拟件,用两种工艺强化薄板有孔模拟件,同时进行了室温和高温温度的低循环疲劳对比考核试验.试验结果表明,对于薄板倒圆孔,T形头挤压工艺强化效果较好,可以有效提高薄板有孔模拟件的低循环疲劳寿命;在同样的强化工艺条件下,低循环疲劳载荷大小影响强化效果,载荷越小效果越明显.In order to enhance the fatigue strength of the pressure equalizing hole on labyrinth seal disc for a compressor,three kinds of coldworking techniques with different processes were designed,namely,one-sided multiple extrusion process,cylindrical extrusion process and T shape extrusion process.Simulations on sheet metal with hole specimen for low cycle fatigue experimentation were designed using two kinds of materials（stainless steel 1Cr11Ni2W2MoV and high temperature nickel-alloy ЗП742）.Sheet metal with hole specimen was strengthened using two kinds of coldworking techniques,namely,single-side and repetitious extrusion method and T head extrusion method.And contrastive low cycle fatigue experimentation was done under two kinds of experiment temperatures,i.e.normal temperature and high temperature.The experimentation and analysis was made for different fatigue loads on how to influence the strength effect.The experiment results show that the effect of T head coldworking techniques is better for sheet metal filleted hole to improve low-cycle fatigue intension of the sheet metal with hole simulation specimen effectively.Under the same strength technique conditions,the size of low cycle fatigue load will influence the strength effect,and the smaller load means more obvious effect.

关 键 词：薄板有孔模拟件 疲劳强度 挤压强化 低循环疲劳 对比试验 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]