锻压技术

圆角滚压对螺栓残余应力分布及疲劳寿命的影响

英文标题：Influence of fillet rolling on residual stress distribution and fatigue life for bolts

分类号：TG379

出版年,卷(期):页码：2023,48(1):108-114

摘要：

利用ABAQUS 结合Fe-safe 建立了TC4 钛合金高锁螺栓的圆角滚压和拉拉疲劳有限元模型, 并进行了试验验证。分析了滚压深度、滚轮圆角半径对螺栓残余应力分布和疲劳寿命的影响规律。滚压后, 螺栓的疲劳寿命由3 万次提高至20 万次以上; 随着滚压深度的增加, 螺栓圆角的最大压应力和压应力深度也随之增加并趋向于稳定, 疲劳寿命出现先增后减的趋势;随着滚轮圆角半径的增加, 滚压后螺栓的压应力区域增大, 表面最大压应力减小, 并在滚轮圆角半径为螺栓圆角半径的90%时趋于稳定, 最佳滚轮圆角半径为螺栓圆角半径的90% ~95%, 尺寸过大或过小均会导致疲劳寿命显著降低。结果表明, 在滚压深度为0. 02 mm、滚轮圆角半径为0. 47 mm 时, 螺栓圆角的疲劳寿命达到最大值。

By using ABAQUS combined with Fe-safe, a finite element model of fillet rolling and tensile fatigue for TC4 titanium alloy high-lock bolts was established, and the experimental verification was carried out. Then, the influences of rolling depth and roller fillet radius on residual stress distribution and fatigue life of bolts were analyzed. And after rolling, the fatigue life of bolt increased from 30000 times to more than 200000 times. Furthermore, with the increasing of rolling depth, the maximum compressive stress and compressive stress depth of bolt fillet also increased and tended to be stable, and the fatigue life first increased and then tended to decrease. With the increasing of roller fillet radius, the compressive stress area of bolt after rolling increased, and the maximum compressive stress on the surface decreased and tended to be stable when the roller fillet radius was 90% of the bolt fillet radius. Thus, the optimal roller fillet radius was 90%-95% of the bolt fillet radius, excessive size or too small size significantly reduced the fatigue life. The results show that the fatigue life of bolt fillet reaches the maximum when the rolling depth is 0. 02 mm and the roller fillet radius is 0. 47 mm.

基金项目：

作者简介: 袁武华(1973-), 男, 博士, 教授 E-mail: yuan46302@ 163. com

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