Simulation study on residual stress and fatigue life of the 7050 lug holes after cold extrusion strengthening

ZHENG Zeting; LI Xiangfeng; YI Zhidong; TANG Wei; LI Wensheng; LIU Yexin

doi:10.16579/j.issn.1001.9669.2026.01.004

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Simulation study on residual stress and fatigue life of the 7050 lug holes after cold extrusion strengthening

·Fatigue·Damage·Fracture·Failure Analysis· | 更新时间：2026-01-21

- Simulation study on residual stress and fatigue life of the 7050 lug holes after cold extrusion strengthening
- Journal of Mechanical Strength Vol. 48, Issue 1, Pages: 33-41(2026)
- 作者机构：
  
  1.南京航空航天大学机电学院，南京 210016
  2.航天精工股份有限公司，天津 300300
  3.天津市紧固连接技术企业重点实验室，天津 300300
- 作者简介：
  
  LI Xiangfeng, E-mail: fxli@nuaa.edu.cn
- 基金信息：
  
  Joint Fund Project of the National Natural Science Foundation of China(U20A20293);Open Subject of Tianjin Key Enterprise Laboratory of Fastening Connection Technology(HTJG-TJ-YJ-2024-2002)
- DOI：10.16579/j.issn.1001.9669.2026.01.004
  CLC： V215.5
- Received：28 April 2024，
  
  Revised：2024-07-10，
  
  Published：15 January 2026
- 稿件说明：
移动端阅览
郑泽庭，黎向锋，易志东，等. 7050耳片孔冷挤压强化残余应力及疲劳寿命仿真研究［J］. 机械强度，2026，48（1）：33-41.

ZHENG Zeting，LI Xiangfeng，YI Zhidong，et al. Simulation study on residual stress and fatigue life of the 7050 lug holes after cold extrusion strengthening［J］. Journal of Mechanical Strength，2026，48（1）：33-41.
郑泽庭，黎向锋，易志东，等. 7050耳片孔冷挤压强化残余应力及疲劳寿命仿真研究［J］. 机械强度，2026，48（1）：33-41. DOI： 10.16579/j.issn.1001.9669.2026.01.004.

ZHENG Zeting，LI Xiangfeng，YI Zhidong，et al. Simulation study on residual stress and fatigue life of the 7050 lug holes after cold extrusion strengthening［J］. Journal of Mechanical Strength，2026，48（1）：33-41. DOI： 10.16579/j.issn.1001.9669.2026.01.004.

摘要

目的

基于冷挤压强化质量的优劣与工艺参数的选取密切相关这一事实，探究不同工艺参数对7050耳片孔经冷挤压强化后的残余应力及疲劳寿命的影响。

方法

首先，利用有限元法探究带PH13-8Mo压合衬套的7050-T7451铝合金耳片孔经冷挤压强化后的残余应力的分布和变化，利用能量法和拉拔力测试证明了建立的有限元模型的有效性。然后，基于有限元疲劳分析软件FE-Safe探究不同工艺参数对耳片孔疲劳寿命的影响规律。最后，通过疲劳试验验证仿真模型和结果的可靠性。

结果

结果表明，芯棒过渡圆弧半径过大或过小均不利于提高耳片孔的疲劳寿命，当芯棒过渡圆弧半径为2 mm左右时，耳片孔的疲劳寿命最长；随着衬套铰孔量的增加，耳片孔的疲劳寿命先变长后变短，当铰孔量为0.8 mm左右时，耳片孔的疲劳寿命最长；孔与衬套的安装间隙越大，耳片孔的疲劳寿命越短。

Abstract

Objective

Based on the fact that the quality of cold extrusion strengthening is closely related to the selection of process parameters

this study investigates the effects of different process parameters on the residual stress and fatigue life of 7050 aluminum alloy lug holes after cold extrusion strengthening.

Methods

Firstly

the distribution and variation of residual stress in 7050-T7451 aluminum alloy lug holes with PH13-8Mo pressed-in bushings after cold extrusion strengthening were explored by using the finite element method. The validity of the established finite element model was confirmed through energy methods and pull-out force tests. Subsequently

the influence patterns of different process parameters on the fatigue life of lug holes were explored based on the finite element fatigue analysis software FE-Safe. Finally

fatigue tests were conducted to verify the reliability of the simulation model and results.

Results

The results indicate that both excessively large and small fillet radii of the mandrel transition are detrimental to improving the fatigue life of the lug holes. When the fillet radius of the mandrel transition is approximately 2 mm

the fatigue life of the lug holes is maximized. With the increase of the bushing reaming allowance

the fatigue life of the lug holes first increases and then decreases

reaching the longest fatigue life at a reaming allowance of about 0.8 mm. Additionally

the larger the installation clearance between the hole and the bushing

the shorter the fatigue life of the lug holes.

关键词

Keywords

references

FU Y C ， GE E D ， SU H H ， et al . Cold expansion technology of connection holes in aircraft structures：a review and prospect ［J］. Chinese Journal of Aeronautics ， 2015 ， 28 （ 4 ）： 961 - 973 .

王燕礼，朱有利，曹强，等 . 孔挤压强化技术研究进展与展望［J］. 航空学报， 2018 ， 39 （ 2 ）： 1 - 17 .

WANG Yanli ， ZHU Youli ， CAO Qiang ， et al . Progress and prospect of research on hole cold expansion technique ［J］. Acta Aeronautica et Astronautica Sinica ， 2018 ， 39 （ 2 ）： 1 - 17 . （In Chinese）

MAHENDRA BABU N C ， JAGADISH T ， RAMACHANDRA K ， et al . A simplified 3-D finite element simulation of cold expansion of a circular hole to capture through thickness variation of residual stresses ［J］. Engineering Failure Analysis ， 2008 ， 15 （ 4 ）： 339 - 348 .

MANN J Y ， JOST G S . Stress fields associated with interference fitted and cold-expanded holes with particular reference to the fatigue life enhancement of aircraft structural joints ［C］. Metals Forum ， 1983 ， 6 （ 1 ）： 43 - 53 .

李敏 . 小直径开缝衬套翻边工艺及冷挤压强化性能研究［D］. 南京：南京航空航天大学， 2017 ： 66 - 67 .

LI Min . Research on flanging process and cold expansion strengthening performance of small-diameter split sleeve ［D］. Nanjing ： Nanjing University of Aeronautics and Astronautics ， 2017 ： 66 - 67 . （In Chinese）

王彩勇 . 小直径开缝衬套冷挤压强化孔疲劳寿命研究［D］. 南京：南京航空航天大学， 2016 ： 64 - 65 .

WANG Caiyong . Research on fatigue life for small diameter split sleeve cold expansion strengthening hole ［D］. Nanjing ： Nanjing University of Aeronautics and Astronautics ， 2016 ： 64 - 65 . （In Chinese）

董卫萍，高飞，邢欣，等 . 开缝衬套冷挤压强化工艺对7050铝合金孔连接结构疲劳寿命的影响［J］. 工具技术， 2021 ， 55 （ 12 ）： 68 - 72 .

DONG Weiping ， GAO Fei ， XING Xin ， et al . Effect of cold extrusion strengthening technology of split-sleeve bushing on fatigue life of 7050 Al alloy hole connection structure ［J］. Tool Engineering ， 2021 ， 55 （ 12 ）： 68 - 72 . （In Chinese）

曹增强，胡朝阳，甘学东，等 . 小边距孔的压合衬套强化工艺研究［J］. 机械强度， 2016 ， 38 （ 5 ）： 1093 - 1098 .

CAO Zengqiang ， HU Zhaoyang ， GAN Xuedong ， et al . The research of bushing strengthening process on short edge-margin hole ［J］. Journal of Mechanical Strength ， 2016 ， 38 （ 5 ）： 1093 - 1098 . （In Chinese）

唐伟，林忠亮，吴保全，等 . 孔结构压合衬套冷挤压强化的疲劳寿命试验研究［J］. 航空精密制造技术， 2022 ， 58 （ 4 ）： 11 - 15 .

TANG Wei ， LIN Zhongliang ， WU Baoquan ， et al . Test study on fatigue life of cold extrusion strengthening bushings for hole structure ［J］. Aviation Precision Manufacturing Technology ， 2022 ， 58 （ 4 ）： 11 - 15 . （In Chinese）

林忠亮，白清顺，唐伟，等 . 压合衬套冷挤压强化的残余应力的数值模拟［J］. 材料导报， 2024 ， 38 （ 3 ）： 192 - 199 .

LIN Zhongliang ， BAI Qingshun ， TANG Wei ， et al . Numerical simulation on the residual stress of compression bushing in cold expansion strengthening ［J］. Materials Reports ， 2024 ， 38 （ 3 ）： 192 - 199 . （In Chinese）

张志贤，张立新，王凡 . 压合衬套强化耳片的疲劳寿命评估［J］. 航空科学技术， 2022 ， 33 （ 3 ）： 97 - 105 .

ZHANG Zhixian ， ZHANG Lixin ， WANG Fan . Evaluation of fatigue life of lug with cold expanded bushing ［J］. Aeronautical Science & Technology ， 2022 ， 33 （ 3 ）： 97 - 105 . （In Chinese）

王幸 . 孔挤压强化钛合金中心孔板疲劳寿命预测与验证［D］. 上海：上海交通大学， 2017 ： 32 - 34 .

WANG Xing . Fatigue life prediction and verification of TC4 central hole plate strengthened by cold expansion ［D］. Shanghai ： Shanghai Jiao Tong University ， 2017 ： 32 - 34 . （In Chinese）

王雨，谢丹，何珞玉，等 . 大型异形环件径-轴向轧制芯辊运动自适应控制［J］. 塑性工程学报， 2021 ， 28 （ 12 ）： 81 - 89 .

WANG Yu ， XIE Dan ， HE Luoyu ， et al . Motion self-adaptive control of mandrel roll in radial-axial rolling for large profiled ring ［J］. Journal of Plasticity Engineering ， 2021 ， 28 （ 12 ）： 81 - 89 . （In Chinese）

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