微结构对多孔材料应变率效应影响的机理研究

王鹏飞; 徐松林; 李志斌; 胡时胜

doi:10.11883/1001-1455(2014)03-0285-07

微结构对多孔材料应变率效应影响的机理研究

doi: 10.11883/1001-1455(2014)03-0285-07

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

基金项目: 国家自然科学基金项目（90916026）

详细信息

作者简介:
王鹏飞(1985—), 男, 博士

通讯作者:
Xu Song-lin, slxu99@ustc.edu.cn

中图分类号: O347.3
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- 文章访问数: 2896
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- 被引次数: 0
出版历程
- 收稿日期: 2012-11-13
- 修回日期: 2013-04-25
- 刊出日期: 2014-05-25

Effect of micro-structure on the strain rate of cellular materials

CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China

摘要

摘要: 通过数值模拟讨论了圆环结构对多孔材料应变率效应的影响，计算结果表明，圆环结构与折板结构一样，同样存在结构的屈曲失稳，因此也具有应变率效应。只是其应变率效应不如折板结构敏感，在小应变下的率效应不明显，在后屈曲失稳阶段率效应较为明显。另外，对于壁厚较薄的圆环结构，加载过程中更容易出现结构的屈曲失稳，此时微结构所引起的应变率效应较明显。壁厚较厚的圆环结构，微结构引起的应变率效应则不显著。通过蜂窝结构的模型更清楚地揭示了微结构对多孔材料变形过程的影响。
- 固体力学 /
- 应变率 /
- 应力均匀 /
- 微结构 /
- 失稳 /
- 多孔材料
Abstract: The strain-rate effects of ring structure are discussed by the numerical simulation method.The calculated results show that the buckling instability exists in both the ring structure and the folded plate structure.For the ring structure, there is a strain-rate effect at the post-buckling stage, but the degree of the strain-rate effect is not more obvious than that for the folded plate structure.In addition, the collapse instability is more obvious, and the strain-rate effect is more sensitive for a thinner thickness ring structure during the compression process.For the thicker thickness, it is difficult to buckling and the strain-rate effect is insensitive during the compression process.The model of circular honeycomb structure is created to indicate that the bucking also exists and is sensitive to the strain rate.
- solid mechanics /
- strain rate /
- stress uniform /
- micro-structure /
- buckling /
- cellular material

HTML全文

图 1 2种类型的率敏感结构^[5]

Figure 1. Two types of velocity sensitive structures^[5]

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图 2 准静态和动态加载模型

Figure 2. Load models under quasi-static and dynamic

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图 3 圆环结构的名义应力应变曲线

Figure 3. Normal stress-strain curves of ring structure

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图 4 圆环结构的变形过程图（ε≤0.45）

Figure 4. Deformation process of ring structure(ε≤0.45)

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图 5 不同应变率下的屈曲失稳模式（ε≈0.72）

Figure 5. Buckling models under different strain-rate(ε≈0.72)

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图 6 圆环结构的变形过程图（H＝0.5 mm，D＝10 mm，网格尺寸0.05 mm）

Figure 6. Deformation process of ring structure(H＝0.5 mm, D＝10 mm, grid size 0.05 mm)

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图 7 不同壁厚的圆环变形过程图（＝10 s^-1）

Figure 7. Deformation process with different wall thickness(＝10 s^-1)

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图 8 圆形蜂窝结构的SHPB模型

Figure 8. SHPB model of circular honeycomb

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图 9 圆环蜂窝的应变率效应

Figure 9. Strain-rate effect of circular honeycomb

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