| 一种用微弯曲实验测定内禀材料长度的新方法 |
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| 引用本文： | 俞叶峰,穆宏巍,邹化民. 一种用微弯曲实验测定内禀材料长度的新方法[J]. 材料研究学报, 2007, 21(1): 37-40 |
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| 作者姓名： | 俞叶峰 穆宏巍 邹化民 |
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| 作者单位： | 武汉大学物理科学与技术学院,武汉,430072;武汉大学物理科学与技术学院,武汉,430072;武汉大学物理科学与技术学院,武汉,430072 |
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| 摘 要： | 提出了一种用微弯曲实验测定材料的与应变梯度塑性相联系的内禀长度的新方法.由一组不同的加载时曲率半径Ri和对应的卸载后曲率半径RFi的比值与Ri的关系,求出屈服强度与杨氏模量的比和硬化系数与杨氏模量的比;再应用这两个比值求出不同样品厚度的无量纲弯曲力矩与表面应变的实验关系曲线,对曲线拟合求出材料的内禀长度.将这种方法用于测定铝的内禀材料长度,研究其弯曲强度的尺寸效应,所得结果与前人用微弯曲和微拉伸两种实验方法得到的结果符合得很好.
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| 关 键 词： | 材料检测与分析技术 微弯曲实验 材料内禀长度 应变梯度塑性 |
| 文章编号： | 1005-3093(2007)01-0037-04 |
| 修稿时间： | 2006-04-03 |
A modified method of micro-bend test for measuring the intrinsic material length |
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| YU Yefeng,MU Hongwei,ZOU Huamin. A modified method of micro-bend test for measuring the intrinsic material length[J]. Chinese Journal of Materials Research, 2007, 21(1): 37-40 |
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| Authors: | YU Yefeng MU Hongwei ZOU Huamin |
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| Affiliation: | School of Physical Science and Technology, Wuhan University, Wuhan 430072 |
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| Abstract: | A modified micro-bend test method for determining the intrinsic materials length in strain gradient plasticity has been developed and described.The ratios of yield strength over Young's modulus and of hardening coefficient over Young's modulus are determined by fitting the variation of the ratio of the curvature radius in loading state,R_i,over the curvature radius in unloading state,R_i~F,with the loaded radius of curvature,R_i.By using these two ratios,the experimental curves of the non-dimensional moment and the surface strain in loading state for different thicknesses are obtained,by which the intrinsic material length can be determined.This method was employed to study the size effect in bending strength of aluminum.The results agreed very well with those measured with both micro-bending and micro-tensile tests reported before. |
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| Keywords: | measuring and analysis for materials micro-bend test material intrinsic length strain gradient plasticity |
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