高应变率载荷下纯钛的非连续冲击疲劳失效模型及其微观机理

惠煜中; 徐浩嘉; 郝宏炜; 沈将华

doi:10.11883/bzycj-2023-0073

高应变率载荷下纯钛的非连续冲击疲劳失效模型及其微观机理

doi: 10.11883/bzycj-2023-0073

惠煜中^1,,
徐浩嘉¹,
郝宏炜¹,
沈将华^{1, 2, ,}

1.
西北工业大学航空学院，陕西西安 710072
2.
陕西省冲击动力学及工程应用重点实验室，陕西西安 710072

基金项目: 国家自然科学基金（11802247）

详细信息

作者简介:
惠煜中（1995－　），男，博士研究生，huiyuzhong@mail.nwpu.edu.cn

通讯作者:
沈将华（1985－　），男，博士，教授，j.shen@nwpu.edu.cn

中图分类号: O383
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- 文章访问数: 162
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- PDF下载量: 57
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-01
- 修回日期: 2023-07-20
- 网络出版日期: 2023-11-16
- 刊出日期: 2024-01-11

Discontinuous impact fatigue failure model and microscopic mechanism of pure titanium under high strain-rate loading

1.
School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China
2.
Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application, Xi’an 710072, Shaanxi, China

摘要

摘要: 基于传统的分离式霍普金森拉杆系统，设计了应变控制的冲击疲劳寿命测试实验，研究了冲击疲劳加载下纯钛的微观演化机制及冲击疲劳对材料宏观力学行为的影响。通过对不同冲击疲劳试验阶段的试样开展准静态力学性能测试，借助扫描电子显微镜 (scanning electron microscope, SEM) 和电子背散射衍射 (electron backscatter diffraction, EBSD) 技术表征试样在不同阶段的微观组织以及冲击疲劳失效后的断口形貌，研究纯钛在冲击疲劳失效过程中的循环硬化/软化规律及其微观演化机制。结果表明：通过改变子弹长度可以实现应变控制的冲击疲劳寿命测试；Manson-Coffin疲劳寿命模型可以较好地反映纯钛的冲击疲劳寿命与应变幅值之间的关系；纯钛在冲击疲劳失效过程中表现出循环硬化的现象，这主要是疲劳过程中孪生变形引起的细晶强化和塑性变形引起的应变硬化共同作用的结果，纯钛的冲击疲劳损伤主要表现为变形能力的损失。
- 冲击疲劳 /
- 纯钛 /
- Manson-Coffin模型 /
- 微观组织
Abstract: The fatigue failure behavior of structural materials under repeated impact loads has always attracted much attention. Mastering its damage accumulation process and evolution mechanism at the micro-scale is the fundamental way to understand the impact fatigue failure mechanism. Due to the complexity of the impact fatigue load itself and the limitations of the current experimental equipment, there are still major problems in the study of impact fatigue failure of materials. Therefore, pure titanium was used as the research object and a strain-controlled impact fatigue life test was designed based on the traditional split Hopkinson tension bar system. The strain-controlled impact fatigue life test was achieved by changing the length of the striker, and the amplitude of the incident wave needed to be kept at the same level when using different striker tests. The relationship between strain amplitude and impact fatigue life was analyzed. The impact fatigue interruption experiments of 5 times, 10 times and 20 times were carried out with 100 mm bullets. The microstructure of the samples after different impact times were characterized by electron backscatter diffraction (EBSD) and then the quasi-static mechanical properties were tested. The fracture morphology after impact fatigue failure was observed by scanning electron microscope (SEM). The cyclic hardening/softening law and its microscopic evolution mechanism of pure titanium during impact fatigue failure were studied. The results show that the strain-controlled impact fatigue life test can be realized by changing the striker length. The Manson-Coffin fatigue life model can better reflect the relationship between impact fatigue life and strain amplitude of pure titanium. Moreover, pure titanium exhibits cyclic hardening during impact fatigue failure, which is mainly due to the combined effect of fine grain strengthening caused by twin deformation and strain hardening caused by plastic deformation during fatigue. Finally, the impact fatigue damage of pure titanium is mainly manifested as the loss of deformation ability.
- impact fatigue /
- pure titanium /
- Manson-Coffin model /
- microstructure

HTML全文

图 1 原始材料的初始微观结构组织

Figure 1. Initial microstructures of the as-received material

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图 2 应变控制的冲击疲劳实验示意图

Figure 2. Schematic diagram of strain-controlled impact fatigue experiment

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图 3 不同长度子弹产生的冲击载荷波形

Figure 3. Impact load waveforms of strikers with different lengths

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图 4 准静态拉伸、动态拉伸和应变率跳跃的真实应力-应变曲线

Figure 4. True stress-strain curves of quasi-static tensile, dynamic tensile and strain rate jump

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图 5 冲击疲劳断裂后及冲击疲劳不同次数后试样的宏观形貌

Figure 5. Macroscopic morphology of the samples after impact fatigue fracture and different times of impact fatigue.

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图 6 冲击疲劳寿命测试结果与Manson-Coffin模型拟合的对比

Figure 6. Comparison between impact fatigue life test results and Manson-Coffin model

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图 7 冲击疲劳不同次数后微观组织的EBSD表征结果

Figure 7. EBSD characterization results of microstructure after different times of impact fatigue

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图 8 冲击疲劳后准静态拉伸的真实应力-应变曲线

Figure 8. True stress-strain curves of quasi-static tension after impact fatigue

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图 9 屈服强度、抗拉强度和伸长率随冲击次数的变化

Figure 9. Changes of yield strength, tensile strength and elongation with impact times

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图 10 冲击疲劳断裂的断口形貌

Figure 10. Fracture morphology of impact fatigue fracture

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图 11 冲击疲劳断裂断面收缩率随应变幅值的变化

Figure 11. Variation of area reduction of impact fatigue fracture surface with impact strain amplitude

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表 1 不同冲击应变幅值下纯钛的冲击疲劳寿命

Table 1. Impact fatigue life of pure titanium under different impact strain amplitudes

Δε_t/2 冲击疲劳寿命/次

0.017 58 62

0.023 21 23 25

0.026 12 16 17

0.035 10 8 11

0.051 5 6 7

0.070 4 4 4

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