Transactions of Materials and Heat Treatment

Title：Influence of fillet rolling on residual stress distribution and fatigue life for bolts

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ClassificationCode：TG379

year,vol(issue):pagenumber：2023,48(1):108-114

Abstract：

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.

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

Reference：

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