| 引用本文: | 俞建超,姜峰,融亦鸣.AISI D2钢力学性能尺寸效应实验研究[J].材料科学与工艺,2012,20(3):83-88.DOI:10.11951/j.issn.1005-0299.20120316. |
| YU Jian-chao,JIANG Feng,RONG Yi-ming.Experimental research on mechanical property size effects of AISI D2 steel[J].Materials Science and Technology,2012,20(3):83-88.DOI:10.11951/j.issn.1005-0299.20120316. |
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| 摘要: |
| 为研究AISI D2钢力学性能尺寸效应现象，在常温下采用电子万能试验机和分离式霍普金森压杆（SHPB）实验装置对3种不同剪切带宽度(分别为800，400，50 μm)的帽形试样进行了准静态和动态加载实验.实验结果表明，流动应力和失效应变随着剪切带宽度的减小而增大，但产生流动应力和失效应变尺寸效应现象的剪切带宽度不同.基于应变率强化项修正的Johnson-Cook本构模型，通过实验数据拟合得到材料的本构关系.研究表明,修正的Johnson-Cook本构模型与实验结果吻合较好. |
| 关键词: 尺寸效应 AISI D2钢 帽形试样 修正的Johnson-Cook本构模型 分离式霍普金森压杆 |
| DOI：10.11951/j.issn.1005-0299.20120316 |
| 分类号:TG115 |
| 基金项目:国家自然科学基金资助项目（No.51105224）;国家重点基础研究发展计划资助项目（2011CB013404）;摩擦学国家重点实验室自主科研重点项目（No.SKLT10A01）. |
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| Experimental research on mechanical property size effects of AISI D2 steel |
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YU Jian-chao1, JIANG Feng1, RONG Yi-ming1,2
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1.State Key Laboratory of Tribology,Department of Precision Instruments and Mechanology,Tsinghua University,Beijing 100084,China;2.Mechanical Engineering Department,Worcester Polytechnic Institute,Worcester 01609,USA
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| Abstract: |
| Quasi-static and dynamic shear deformation of hat shaped specimen with three different widths of shear zone（800,400,50 μm respectively）were performed by electronic universal testing machine and Split Hopkinson Pressure Bar（SHPB）at room temperature.The size effects of AISI D2 steel mechanical property were studied.The experimental results show that the flow stress and failure strain of material increase with the decrease of shear zone widths,however the shear zone widths which induce the size effect of flow stress and failure strain are different.Based on the Johnson-Cook constitutive model,the constitutive relation of material with different shear zone widths was fitted by the experiment results.The item of strain rate sensitivity is modified,and the modified Johnson-Cook constitutive model agrees well with the experimental results. |
| Key words: size effect AISI D2 steel hat shaped specimen modified Johnson-Cook constitutive model Split Hopkinson Pressure Bar |
