吉林大学学报(工学版) ›› 2024, Vol. 54 ›› Issue (6): 1563-1569.doi: 10.13229/j.cnki.jdxbgxb.20220958

• 材料科学与工程 • 上一篇    

2024-O铝合金搅拌摩擦焊接头疲劳裂纹扩展行为及寿命预测

王磊1,2(),李东侠2,周松2,3,回丽3,沈振鑫2   

  1. 1.苏州科技大学 机械工程学院，江苏 苏州 215009
    2.沈阳航空航天大学 机电工程学院，沈阳 110136
    3.沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室，沈阳 110136
  • 收稿日期:2022-07-31 出版日期:2024-06-01 发布日期:2024-07-23
  • 作者简介:王磊（1981-），男，教授，博士.研究方向：机械材料及焊接结构强度评定与寿命分析.E-mail：leiwang@sau.edu.cn
  • 基金资助:
    国家自然科学基金项目(51775355)

Fatigue crack propagation behavior and life prediction of 2024-O aluminum alloy FSW joints

Lei WANG1,2(),Dong-xia LI2,Song ZHOU2,3,Li HUI3,Zhen-xin SHEN2   

  1. 1.College of Mechanical Engineering，Suzhou University of Science and Technology，Suzhou 215009，China
    2.School of Mechatronics Engineering，Shenyang Aerospace University，Shenyang 110136，China
    3.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process，Shenyang Aerospace University，Shenyang 110136，China
  • Received:2022-07-31 Online:2024-06-01 Published:2024-07-23

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摘要：

通过试验和基于FRANC 3D与ABAQUS联合仿真的方法对2024-O高配铝合金搅拌摩擦焊预制裂纹于焊核区、热影响区和垂直于焊缝方向的裂纹扩展行为进行了分析及寿命预测。结果表明，预制裂纹于3个区域裂纹扩展路径和裂纹扩展速率的仿真结果与试验结果基本吻合；预制裂纹于3个区域的裂纹扩展寿命由短到长依次为：焊核区、热影响区、垂直于焊缝方向；通过FRANC 3D对3种试样进行寿命预测结果与试验结果的相对误差在5%左右，验证了通过联合仿真的方法对焊接接头分区域模拟高配铝合金搅拌摩擦焊裂纹扩展行为和寿命预测的准确可行性。

关键词: 机械设计, 2024-O铝合金, 搅拌摩擦焊, FRANC 3D, 裂纹扩展, 寿命预测

Abstract:

The crack propagation behavior of 2024-O high-profile aluminum alloy friction stir welding prefabricated cracks in the weld nugget region， heat-affected region and perpendicular to the weld direction is analyzed through experiments and the method based on FRANC 3D and ABAQUS co-simulation， and the life prediction was carried out. The results show that the simulation results of crack propagation path and crack propagation rate in three regions are in good agreement with the experimental results. The crack propagation life of prefabricated cracks in three regions from low to high is weld core region， heat affected region， perpendicular to the weld. The relative error between the life prediction results of three kinds of samples and the test results by FRANC 3D is about 5%， which verifies the accuracy and feasibility of the co-simulation method to simulate the crack propagation behavior and life prediction of high-distribution aluminum alloy friction stir welding in different regions of welded joints.

Key words: mechanical design, 2024-O aluminum alloy, friction stir welding, FRANC 3D, crack propagation, life prediction

中图分类号: 

  • TG405

图1

预制裂纹于不同区域的裂纹扩展试样（单位：mm）"

图2

裂纹扩展仿真流程图"

表1

ABAQUS输入焊接接头不同分区材料参数"

分区弹性模量E/MPa泊松比μ屈服强度σs/MPa
母材73 0000.3362.7
热机影响区73 0000.33113.6
热影响区73 0000.33101.3
焊核73 0000.33201.5

图3

模型分区的CT试样图"

表2

疲劳裂纹扩展Paris基本参数"

裂纹位置mC门槛值ΔKth/MPa
NZ2.978.58×10-1242.1
HAZ3.11.11×10-1135.4
PWZ3.955.98×10-1338.9

图4

2024-O铝合金FSW多区域裂纹扩展路径"

图5

FRANC 3D仿真2024-O铝合金FSW多区域裂纹扩展路径"

图6

2024-O铝合金FSW多区域裂纹扩展速率曲线"

图7

2024-O铝合金FSW多区域裂纹扩展a-N曲线"

图8

2024-O铝合金FSW多区域裂纹扩展寿命"

图9

2024-O铝合金FSW多区域裂纹低速扩展区微观断口形貌"

图10

2024-O铝合金FSW多区域裂纹中速扩展区微观断口形貌"

图11

2024-O铝合金FSW多区域裂纹高速扩展区微观断口形貌"

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