Mo-ZrC梯度金属陶瓷的冲击响应行为

谢雨珊; 陆建华; 徐松林; 舒在勤; 张金咏

doi:10.11883/bzycj-2022-0374

Mo-ZrC梯度金属陶瓷的冲击响应行为

doi: 10.11883/bzycj-2022-0374

谢雨珊^1,,
陆建华¹,
徐松林^{1, 2, ,},
舒在勤³,
张金咏³

1.
中国科学技术大学中国科学院材料力学行为和设计重点实验室，安徽合肥 230027
2.
中国地震局地震预测研究所高压物理与地震科技联合实验室，北京 100036
3.
武汉理工大学材料复合新技术国家重点实验室，湖北武汉430070

基金项目: 国家自然科学基金（11672286,11602267,11872361）；安徽省自然科学基金（1708085MA05）；高压物理与地震科技联合实验室室开放基金（2019HPPES01）

详细信息

作者简介:
谢雨珊（1998－　），女，硕士，sa20005048@mail.ustc.edu.cn

通讯作者:
徐松林（1971－　），男，博士，研究员，博士生导师， slxu99@ustc.edu.cn

中图分类号: O382
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出版历程
- 收稿日期: 2022-08-26
- 修回日期: 2022-11-03
- 网络出版日期: 2023-02-23
- 刊出日期: 2023-03-05

On impact properties of Mo-ZrC gradient metal ceramics

1.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China
2.
United Laboratory of High Pressure Physics and Earthquake Science, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China
3.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, Hubei, China

摘要

摘要: 分层梯度材料特定的梯度变化能有效增强材料性能。为研究梯度结构、冲击方向对分层梯度材料冲击响应的影响，利用分离式霍普金森压杆结合高速摄影技术对Mo-ZrC分层梯度金属陶瓷进行了动态压缩实验，基于数字图像相关技术讨论了梯度结构、冲击方向对金属陶瓷材料破坏模式的影响，利用Mori-Tanaka理论计算得到金属陶瓷等效性质，结合应力波理论研究波在分层梯度复合材料中的传播规律。结果表明：(1) 相同加载条件下，梯度结构对材料的强度、韧性和破坏产物的完整性具有重要影响，在冲击过程中，样品响应可以分为压紧阶段、裂纹成核发展阶段和贯穿阶段，对于不同梯度结构和冲击方向，样品在加载过程中呈现出不同的破坏时序和失效模式；(2) 利用数字图像相关方法跟踪分层梯度陶瓷的局部变形发展，分析发现局部增量达到临界状态后，局部变形发展转化为微裂纹的形成和累积，最终导致整体性破碎失效；(3) 通过分层梯度材料一维应力波传播理论推导得到，改变冲击梯度方向对应力波透反射系数存在一定影响，不同梯度结构设计对改变冲击梯度方向敏感性不同，且存在极值情况。
- 冲击动力学 /
- Mo-ZrC金属陶瓷 /
- 分层结构 /
- 应力波传播
Abstract: Molybdenum (Mo) and zirconium carbide (ZrC) ceramic possess high strength and good wear resistance. Specific gradient changes of layered gradient structure can effectively take advantage of the two materials. To study the effects of gradient structure and impact direction on the dynamic responses of Mo-ZrC layered gradient cermet, the low-speed dynamic compression test of layered gradient cermet was launched by the split Hopkinson pressure bar device combined with high-speed photography technology, and three kinds of samples with different graded structures were pre-designed and sintered. Based on the digital image correlation (DIC) technology, the effects of gradient structure and impact direction on the failure modes of layered gradient cermet were discussed in detail. The propagation of the one-dimensional stress wave in the layered gradient composite was analyzed according to the equivalent properties of each layer of graded cermet calculated by the Mori-Tanaka theory. Results show as follows. (1) Under the same loading condition, the layered gradient structure has an important influence on material strength and integrity of the damaged product. Samples with a higher overall metal content exhibit better performance. In the process of impaction, the dynamic impaction responses can divide into three stages: compression, crack nucleation, and penetration. According to the results of high-speed photography, different gradient structure and direction of impact damage present different temporal and modes. (2) With the help of the calculation results based on the DIC method, the local deformation development of layered gradient cermet is tracked. When the local incremental development reaches a critical state, the local deformation development turns to the formation and accumulation of micro-cracks, which would lead to overall failure eventually. (3) Based on the one-dimensional stress wave propagation theory of layered gradient materials, the changing of impact direction influences the permeability and reflection coefficient of the stress wave, different gradient structure design shows sensitivity difference to the impact direction change, and there are extreme values.
- impact dynamics /
- Mo-ZrC cermet /
- layered structure /
- stress wave propagation

HTML全文

图 1 不同Mo-ZrC梯度金属陶瓷样品中Mo体积分数的空间分布及样品2 中不同位置的SEM形貌

Figure 1. Spatial distribution of Mo volume fraction in different Mo-ZrC gradient metal ceramics smaples and SEM morphologies at different positions in sample 2

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图 2 实验装置示意简图

Figure 2. Schematic diagram of experimental devices

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图 3 不同Mo-ZrC梯度金属陶瓷样品的工程应力-应变曲线

Figure 3. Engineering stress-strain curves of different Mo-ZrC gradient metal ceramics smaples

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图 4 样品1冲击加载破碎过程

Figure 4. Crushing process of sample 1 under impact loading

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图 5 样品2冲击加载破碎过程

Figure 5. Crushing processes of sample 2 under impact loading

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图 6 样品3冲击加载破碎过程

Figure 6. Crushing processes of sample 3 under impact loading

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图 7 冲击过程中样品2的灰度标准差沿梯度方向的分布

Figure 7. Distribution of gray standard deviation of sample 2along the graded direction during impact

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图 8 样品2全场灰度标准差分布

Figure 8. Distribution of full-field gray standard deviation of sample 2 at different times

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图 9 不同时刻，样品1等效应变场

Figure 9. Equivalent shear strain fields of sample 1 at different times

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图 10 不同时刻，样品2的等效应变场

Figure 10. Equivalent shear strain fields of sample 2 at different times

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图 11 不同时刻，样品3的等效应变场

Figure 11. Equivalent shear strain field of sample 3 at different times

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图 12 一维应力波在不同结构中的传播^[22]

Figure 12. One-dimensional stress wave propagation in different structures^[22]

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图 13 透射系数的实验结果及理论分布情况

Figure 13. Variation of the transmission coefficientwith gradient direction based on experiment and theoretical calculation

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图 14 改变冲击方向归一化透射系数差值分布情况

Figure 14. Variation of the normalized transmission difference with gradient exponent

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图 15 不同入射角频率下透射系数的分布

Figure 15. Distribution of transmission coefficients at different incident angular frequencies

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图 16 不同入射角频率下归一化透射系数差值的分布

Figure 16. Distribution of normalized transmission differences at different incident angular frequencies

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图 17 不同模量下归一化透射系数差值的分布

Figure 17. Distribution of normalized transmission differences at different moduli

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表 1 Mo和ZrC材料力学能参数^{[16, 18]}

Table 1. Mechanical properties of Mo and ZrC^{[16, 18]}

材料	密实度	密度/(kg·m⁻³)	模量/GPa	波速/(m·s⁻¹)	泊松比	熔点/℃
Mo	0.95	10200	279	5230	0.32	3400
ZrC	0.98	6510	390	7740	0.191	2620

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表 2 Mo-ZrC梯度金属陶瓷梯度结构

Table 2. Gradient structure of Mo-ZrC gradient metal ceramics

层编号	质量分数/%
	样品 1		样品 2		样品 3
	Mo	ZrC	Mo	ZrC	Mo	ZrC
1	100	0	100	0	100	0
2	80	20	90	10	65	35
3	60	40	80	20	30	70
4	40	60	70	30	20	80
5	20	80	35	65	10	90
6	0	100	0	100	0	100

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