动态压缩下Zr基非晶合金失效释能机理

张云峰; 罗兴柏; 施冬梅; 张玉令; 刘国庆; 甄建伟

doi:10.11883/bzycj-2018-0114

动态压缩下Zr基非晶合金失效释能机理

doi: 10.11883/bzycj-2018-0114

陆军工程大学石家庄校区，河北石家庄 050000

详细信息

作者简介:
张云峰（1990－　），男，博士研究生，1193954881@qq.com

通讯作者:
张玉令（1983－　），男，博士，讲师，zhangyuling2009@163.com

中图分类号: O347; TB33
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- 被引次数: 0
出版历程
- 收稿日期: 2018-04-09
- 修回日期: 2018-05-30
- 网络出版日期: 2019-07-25
- 刊出日期: 2019-06-01

Failure behavior and energy release of Zr-based amorphous alloy under dynamic compression

Shijiazhuang Campus, Army Engineering University, Shijiazhuang 050000, Hebei, China

摘要

摘要: 为研究Zr基非晶合金动态压缩条件下的失效释能机理，采用力学试验机、霍普金森杆、高速摄影、差示扫描量热分析（differential scanning calorimetry, DSC）、扫描电镜（scanning electron microscope，SEM）等，得到了材料应力应变曲线、高速摄影图像、失效式样微观形貌及DSC曲线，根据实验数据计算了材料的晶化激活能，并拟合了材料的JH-2（Johnson-Holmquist II）模型，对材料动态失效过程进行有限元数值模拟。实验结果表明，压缩条件下材料为脆性断裂，断口处观察到典型的脉状纹样及液滴状结构，材料失效过程伴随着释能现象；数值模拟结果表明，材料裂纹局部的瞬时内能大于材料晶化激活能。动态压缩下材料的失效释能机理即为材料破碎释放储存的弹性势能，并导致材料局部晶化释能，释能强度与应变率成正相关。
- Zr基非晶合金 /
- 动态压缩 /
- 失效 /
- 释能 /
- 高速摄影
Abstract: To study the mechanism of failure behavior and energy release mechanism of Zr-based amorphous alloys, Instron machine, split hopkinson bar, high-speed photography, DSC and SEM are used to achieve the stress-strain curves at low strain rate, stress-strain curves at high strain rate, failure processes, DSC curves and failure morphologies, respectively. The crystallization enthalpy is obtained from DSC curves. The stress-strain curves are fitted by the Johnson-Holmquist II model, and the finite element method using this model is executed to simulate the failure process of material under dynamic compression. The experimental results suggest that the material fractures brittle under compression. Typical vein-like pattern is observed at the fracture surface of the material. The energy releasing occurs simultaneously with the material failure. The simulation results reveal that the internal energy of local crack is higher than crystallization enthalpy of the material. The energy release of Zr-based amorphous alloys results in the elastic potential energy and crystallization energy released by the material with instantaneous crack. The strength of energy release is in direct proportion to strain rates.
- Zr-based amorphous alloys /
- dynamic compression /
- failure /
- energy release /
- high-speed imaging

HTML全文

图 1 动态压缩实验装置

Figure 1. Dynamic compression experimental facility

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图 2 不同升温速率下热流随温度变化曲线

Figure 2. Curves of endothermic heat flow as a function of temperature at different heating rates

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图 3 材料压缩应力应变曲线

Figure 3. Stress-strain curves of Zr-based amorphous alloys in compression

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图 4 静态实验试样SEM照片

Figure 4. SEM images of static compressed samples

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图 5 动态实验试样SEM照片

Figure 5. SEM images of dynamic compressed samples

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图 6 材料高速摄影图像

Figure 6. High-speed photography of material failure

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图 7 材料动态压缩高速摄影图像

Figure 7. High-speed photography of material under dynamic compression

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图 8 材料的应变率敏感性

Figure 8. Strain rate sensitivity of the material

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图 9 3 129 s⁻¹应变率下材料损伤云图

Figure 9. Damage maps of material under the strain rate of of 3 129 s⁻¹

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图 10 不同应变率下材料损伤云图

Figure 10. Damage patterns of materials at different strain rates

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图 11 材料失效时内能云图

Figure 11. Internal energy patterns of materials when failure occurs

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表 1 材料的JH-2材料模型参数

Table 1. JH-2 model constants of the material

材料	K₁/GPa	K₂ /GPa	K₃/GPa	D₁	D₂
ZrTiNiCuBe	114.3	268.5	1 386	0.21	1.75

材料	A	B	C	M	N
ZrTiNiCuBe	1.162	0.258	0.017 3	0.59	0.829

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