| 微小尺度流动应力波动尺度效应 |
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| 引用本文： | 申昱,于沪平,阮雪榆.微小尺度流动应力波动尺度效应[J].上海交通大学学报,2006,40(6):906-908. |
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| 作者姓名： | 申昱 于沪平 阮雪榆 |
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| 作者单位： | 上海交通大学,国家模具CAD工程研究中心,上海,200030 |
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| 摘 要： | 通过对常温下具有不同晶粒直径的微型铜圆柱体进行镦粗实验,研究了微小尺度下流动应力波动尺度效应现象.结果表明,在应变量相同条件下,流动应力波动幅度随晶粒尺寸的增大而线性增大;在晶粒尺寸相同条件下,流动应力波动幅度随应变量的增大而增大.基于晶体塑性理论及数理统计理论,建立了流动应力波动幅度与晶粒尺寸和坯料几何尺寸间的关系.
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| 关 键 词： | 微成形 尺度效应 流动应力 波动 |
| 文章编号： | 1006-2467(2006)06-0906-03 |
| 收稿时间： | 2005-06-13 |
| 修稿时间： | 2005年6月13日 |
The Scale Effect of Flow Stress Fluctuation in Micro Scale |
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| SHEN Yu,YU Hu-ping,RUAN Xue-yu.The Scale Effect of Flow Stress Fluctuation in Micro Scale[J].Journal of Shanghai Jiaotong University,2006,40(6):906-908. |
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| Authors: | SHEN Yu YU Hu-ping RUAN Xue-yu |
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| Institution: | National Die and Mold CAD Eng. Research Center, Shanghai Jiaotong Univ. , Shanghai 200030, China |
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| Abstract: | In order to study the scale effect of flow stress fluctuation,micro copper cylinders with different grain size were compressed at room temperature.The result shows that in micro scale,under the condition of same strain,the fluctuation of flow stress is linearly increased with the increase of grain dimensions;under the condition of same grain dimensions,the fluctuation of flow stress is increased with the increase of strain.Based on the crystal plasticity theory and mathematical theory of statistics,the relation of flow stress fluctuation quantity to grain dimension as well as billet dimensions was built. |
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| Keywords: | microform scale effect flow stress fluctuation |
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