工业纯钛TA2拉伸及低周疲劳性能的各向异性

梁远长; 常乐; 周昌玉

doi:10.7513/j.issn.1004-7638.2022.02.007

工业纯钛TA2拉伸及低周疲劳性能的各向异性

doi: 10.7513/j.issn.1004-7638.2022.02.007

南京工业大学机械与动力工程学院, 江苏南京 210000

基金项目: 国家自然科学基金资助（编号：51905260，51975271）。

详细信息

作者简介:
梁远长（1999—），男，四川达州人，硕士，主要从事钛金属力学行为研究，E-mail: 860332179@qq.com

通讯作者:
常乐（1991—），男，副研究员，主要从事化工设备的结构强度研究，E-mail: chellechang@163.com

中图分类号: TF823,TG146.2
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出版历程
- 收稿日期: 2022-01-21
- 网络出版日期: 2022-05-11
- 刊出日期: 2022-04-28

Anisotropy of tensile and low cycle fatigue properties of commercial pure titanium TA2

School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210000, Jiangsu, China

摘要

摘要: 为系统研究工业纯钛TA2拉伸性能及低周疲劳性能的各向异性，沿轧制方向（RD）、与RD呈30°方向（RD-30°）、与RD呈60°方向（RD-60°）及垂直轧制方向（TD）开展了室温拉伸及低周疲劳试验。结果表明：随着取样角度增加，屈服强度增加，屈强比上升，材料的塑性下降。基于Hollomon模型及Johnson-Cook模型对工业纯钛真实应力应变曲线进行预测，发现Hollomon模型预测精度更高。低周疲劳试验结果表明：不同取样方向的试样均呈现循环软化特征，随着取样角度增加，恒定应变幅下循环应力幅值增加，总的应变能密度增加，导致疲劳寿命呈下降趋势。不同取向试样的低周疲劳寿命满足Manson-coffin经验关系式。
- 工业纯钛 /
- 拉伸性能 /
- 低周疲劳性能 /
- 各向异性
Abstract: To systematically study the anisotropy of tensile and low cycle fatigue properties of commercial pure titanium, tensile and low cycle fatigue tests at room temperature were carried out along the rolling direction (RD), 30° to RD (RD-30°), 60° to RD (RD-60°) and transverse direction (TD). With the increase of sample angle, the yield strength and yield ratio increase, and the plasticity of the material decreases. The Hollomon model and Johnson-Cook model were used to predict the true stress-strain curve of commercial pure titanium, and it was found that the Hollomon model has higher prediction accuracy. Low cycle fatigue test results find that all samples show cyclic softening feature. The cyclic stress amplitude increases with the increase of sample angle, and the total strain energy density increases, resulting in a decreasing trend of fatigue life. The low cycle fatigue life of specimens with different orientations satisfies Manson- Coffin empirical relation.
- commercial pure titanium /
- tensile properties /
- low cycle fatigue properties /
- anisotropy

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图 1 拉伸试样尺寸

Figure 1. Tensile sample size

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图 2 疲劳试样尺寸

Figure 2. Fatigue sample size

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图 3 试样排布情况

Figure 3. Sample arrangement

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图 4 母材金相

Figure 4. Metallography of base metal

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图 5 TA2拉伸力学性能随加载方向和应变速率变化

（a）屈服强度；(b)抗拉强度；(c)断后延伸率；(d)屈强比

Figure 5. Variations of tensile mechanical properties of TA2 with loading direction and strain rate

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图 6 Hollomon本构模型和JC本构模型预测情况

Figure 6. Prediction results of Hollomon and JC constitutive model

(a) RD；(b) RD-30°；(c) RD-60°；(d) TD

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图 7 循环应力幅与（a）应变幅值及（b）加载方向的相关性

Figure 7. Dependence of cyclic stress amplitude with (a) strain amplitude and (b) loading direction

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图 8 疲劳寿命随加载方向的变化情况

Figure 8. Variation of fatigue life with loading direction

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图 9 总应变能密度随加载方向和幅值变化情况

Figure 9. Variation of total strain energy density with loading direction and amplitude

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图 10 基于总应变能密度的疲劳寿命预测与试验结果对比

Figure 10. Comparison between fatigue life prediction by total strain energy density and experimental results

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图 11 Manson-coffin模型预测寿命与试验结果对比

Figure 11. Comparison between predicted life by Manson-coffin model and experimental results

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表 1 TA2的化学成分

Table 1. Chemical compositions of TA2 %

Ti	Fe	C	N	H	O	其它元素
Ti	Fe	C	N	H	O	单个	总和
> 99	0.02	0.01	0.01	0.002	0.14	< 0.1	< 0.4

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表 2 不同疲劳模型参数拟合值

Table 2. Fitting values of different fatigue model parameters

加载方向	Manson-coffin模型				基于总能量密度模型
加载方向	$\sigma _{{f}}^{'}$	$\varepsilon _f^{'}$	b	c	k	c
RD	852.23	5.57	−0.1072	−0.3104	1.99	−0.524
30^o	804.06	6.35	−0.0966	−0.3378	2.84	−0.568
60^o	862.81	7.46	−0.1008	−0.3908	2.99	−0.590
TD	925.24	8.21	−0.1028	−0.4191	4.3	−0.651

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