基于能量耗散的激光焊对接接头高周疲劳性能快速评估

魏巍; 张运通; 刘柯; 贾昕; 杨鑫华

doi:10.12073/j.hjxb.20210607001

基于能量耗散的激光焊对接接头高周疲劳性能快速评估

魏巍^{1, 2,},
张运通^{1, 2},
刘柯^{1, 2},
贾昕^{1, 2},
杨鑫华^{1, 2, ,}

1.
大连交通大学, 大连, 116028
2.
辽宁省轨道交通装备焊接与可靠性重点实验室, 大连, 116028

基金项目: 国家自然科学基金资助项目(51875072, 52005071)；辽宁省高等学校国(境)外培养项目(2018LNGXGJWPY-YB012)

详细信息

作者简介:
魏巍，博士研究生；主要研究方向为焊接结构疲劳服役与可靠性分析；Email： ouyangweirui1995@163.com

通讯作者:
杨鑫华，教授；Email：yangxh@djtu.edu.cn.

中图分类号: TG 405
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出版历程
- 收稿日期: 2021-06-06
- 网络出版日期: 2021-12-22
- 刊出日期: 2021-12-24

Rapid high-cycle fatigue performance evaluation of laser-butt joints based on energy dissipation

WEI Wei^{1, 2,},
ZHANG Yuntong^{1, 2},
LIU Ke^{1, 2},
JIA Xia^{1, 2},
YANG Xinhua^{1, 2, ,}

1.
Dalian Jiaotong University, Dalian, 116028, China
2.
Liaoning Key Laboratory of Welding and Reliability of Rail Transportation Equipment, Dalian, 116028, China

摘要

摘要: 基于红外热像法获得对接接头疲劳自热温升数据，建立激光焊对接接头能量耗散疲劳评估模型. 借助能量耗散模型，对Q310NQL2-Q345NQR2激光焊接头高周疲劳过程的疲劳性能进行了研究. 结果表明，随着应力幅值的增加，Q310NQL2-Q345NQR2激光焊接头的能量耗散随之增加，并在疲劳极限附近出现了拐点. 结合 RVE(representative volume element)模型分析，该拐点正是材料内部从单一的可逆微结构运动到同时包括可逆和不可逆的微结构运动的转折点. 其中不可逆微结构运动相应于引起材料损伤的非弹性耗散，当损伤累积到一定程度，其相应的非弹性能量耗散也存在阀值. 以此阀值作为疲劳寿命预测参量，建立高周疲劳激光焊对接接头疲劳寿命预测模型，实现S-N曲线的快速预测.
- 激光焊对接接头 /
- 能量耗散 /
- 疲劳极限 /
- S-N曲线
Abstract: The fatigue evaluation model of laser-welded butt joint based on energy dissipation is established using the data of fatigue self-heating measured by an infrared thermal imager. The fatigue performance of the Q310NQL2-Q345NQR2 laser welded joint during the high-cycle fatigue (HCF) process is studied based on the presented model. The results show that as the stress amplitude increases, the energy dissipation of the Q310NQL2-Q345NQR2 laser welded joint increases, and when combined with the (representative volume element) RVE model to analyze, the knee point is exactly the turning point near the fatigue limit where the microstructure movement within the material gradually changes from only reversible behavior to both reversible and irreversible behaviors. The irreversible microstructure movement corresponds to the induced-damage inelastic dissipation. When the damage accumulates to a certain extent, the corresponding inelastic energy dissipation reaches a threshold value. Therefore, if taking this threshold value as the fatigue life prediction index, the HCF fatigue life prediction model of the laser-welded butt joint is well established for realizing the rapid prediction of the S-N curve.
- laser-butt joints /
- energy dissipation /
- fatigue limit /
- S-N curve

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图 1 基于RVE模型的宏微观力学行为分析示意图

Figure 1. Fig. 1 Schematic of macro and micro mechanical behavior analysis based on RVE model. (a) RVE model; (b) number of the activated atoms

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图 2 温升进程示意图

Figure 2. Schematic of temperature evolution

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图 3 基于能量耗散的疲劳极限预测模型

Figure 3. Fatigue limit prediction model based on energy dissipation

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图 4 试件几何尺寸

Figure 4. Dimension of specimen

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图 5 疲劳试验设备

Figure 5. Fatigue test equipment

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图 6 基于能量耗散的疲劳极限预测

Figure 6. Fatigue limit prediction based on energy dissipation

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图 7 基于传统升降法的疲劳极限评估

Figure 7. Fatigue limit evaluation based on traditional staircase method

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图 8 基于能量方法和传统试验获得的S-N曲线

Figure 8. S-N curve obtained based on energy method and traditional tests

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表 1 Q310NQL2耐候钢主要化学成分

Table 1 Main chemical composition of Q310NQL2 weathering steel

C Si Mn P S Cu Cr Ni Fe

≤0.12 0.25 ~ 0.75 0.20 ~ 0.50 0.06 ~ 0.12 ≤0.02 0.25 ~ 0.50 0.30 ~ 1.25 0.12 ~ 0.65 96.09 ~ 98.68

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表 2 Q345NQR2耐候钢主要化学成分

Table 2 Main chemical composition of Q345NQL2 weathering steel

C Si Mn P S Cr Ni Cu Ti Fe

≤0.12 0.25 ~ 0.75 0.20 ~ 0.50 0.06 ~ 0.12 ≤0.02 0.30 ~ 1.25 0.12 ~ 0.65 0.25 ~ 0.50 — 96.09 ~ 98.68

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表 3 激光焊对接接头力学性能

Table 3 Mechanical property of laser welding butt joints

屈服强度
R_eL/MPa 抗拉强度
R_m/MPa 屈强比
R 断后伸长率
A(%)

406 537 0.76 ≥14.28

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表 4 应力幅为148.5 MPa的试件能量耗散值

Table 4 Energy dissipation of three specimens under the stress amplitude equals 148.5 MPa

编号能量耗散E_c/(10⁹ J·m⁻³) 平均能量耗散$\bar E_{\rm{c}} $/(10⁹ J·m⁻³)

1 2.55
2 3.06 3.31
3 4.33

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参考文献(17)

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C	Si	Mn	P	S	Cu	Cr	Ni	Fe
≤0.12	0.25 ~ 0.75	0.20 ~ 0.50	0.06 ~ 0.12	≤0.02	0.25 ~ 0.50	0.30 ~ 1.25	0.12 ~ 0.65	96.09 ~ 98.68

	屈服强度 R_eL/MPa	抗拉强度 R_m/MPa	屈强比 R	断后伸长率 A(%)
	406	537	0.76	≥14.28

编号	能量耗散E_c/(10⁹ J·m⁻³)	平均能量耗散$\bar E_{\rm{c}} $/(10⁹ J·m⁻³)
1	2.55
2	3.06	3.31
3	4.33

基于能量耗散的激光焊对接接头高周疲劳性能快速评估

作者简介: 魏巍，博士研究生；主要研究方向为焊接结构疲劳服役与可靠性分析；Email： ouyangweirui1995@163.com

通讯作者: 杨鑫华，教授；Email：yangxh@djtu.edu.cn.

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出版历程

Rapid high-cycle fatigue performance evaluation of laser-butt joints based on energy dissipation

计量

出版历程

目录

作者简介:
魏巍，博士研究生；主要研究方向为焊接结构疲劳服役与可靠性分析；Email： ouyangweirui1995@163.com

通讯作者:
杨鑫华，教授；Email：yangxh@djtu.edu.cn.