徐道春,冯平法,郁鼎文,吴志军.铝合金6061-T6高速切削物理仿真材料本构模型[J].农业机械学报,2012,43(12):273-277.
Xu Daochun,Feng Pingfa,Yu Dingwen,Wu Zhijun.Constitutive Model of Physical Simulation in High Speed Cutting [J].Transactions of the Chinese Society for Agricultural Machinery,2012,43(12):273-277.
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铝合金6061-T6高速切削物理仿真材料本构模型   [下载全文]
Constitutive Model of Physical Simulation in High Speed Cutting    [Download Pdf][in English]
  
DOI:10.6041/j.issn.1000-1298.2012.12.049
中文关键词:  分离式Hopkinson压杆技术  应变强化  应变率强化  热软化效应
基金项目:国家自然科学基金资助项目(50975153)、中央高校基本科研业务费专项资金项目(TD2011-26)和北京林业大学青年教师科研启动基金资助项目(BLX2011018)
作者单位
徐道春 北京林业大学 
冯平法 清华大学 
郁鼎文 清华大学 
吴志军 清华大学 
中文摘要:在分离式Hopkinson压杆实验(SHPB)和准静态压缩实验装置上对铝合金6061-T6进行了高温(20~500℃)高应变率(达104/s)下的动、静态力学性能实验,在获得应变强化、应变率强化和热软化效应曲线的基础上,修正了经典的JC(Johnson-Cook)方程,并在仿真模型中验证了所得MJC方程的有效性。研究表明:铝合金6061-T6材料流变应力随应变和应变率的升高而升高,随变形温度升高而降低;提出的JC修正方程较JC方程具有更高的本构关系描述精度;所获得的铝合金6061-T6材料本构方程,为该材料高速切削物理仿真提供了精确的动、静态材料模型参数。
Xu Daochun  Feng Pingfa  Yu Dingwen  Wu Zhijun
Beijing Forestry University;Tsinghua University;Tsinghua University;Tsinghua University
Key Words:SHPB, Strain hardening, Strain rate strengthening, Thermal softening
Abstract:The quasi-static and dynamic mechanical properties experiment of Al6061-T6 in high temperature (20~500℃) and high strain rate (up to 104/s) was carried out on the quasi-static press and split Hopkinson press bar (SHPB) equipment. Then the effect curves of strain hardening, strain rate strengthening and thermal softening were obtained. According to these curves, the classic JC (Johnson-Cook) equation was modified. Furthermore, the modified JC equation was validated in the high speed cutting physical simulation model. The results showed that the Al6061-T6 flow stress increased with the increasing of strain and strain rate, and obviously decreased with the increasing of deformation temperature. The description accuracy of the modified JC equation was higher than the JC equation. The obtained Al6061-T6 constitutive equation can provide important material parameters for physical simulation models of its high speed machining process.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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