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鋁合金6061-T6高速切削物理仿真材料本構(gòu)模型
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國家自然科學(xué)基金資助項目(50975153),、中央高?；究蒲袠I(yè)務(wù)費專項資金項目(TD2011-26)和北京林業(yè)大學(xué)青年教師科研啟動基金資助項目(BLX2011018)


Constitutive Model of Physical Simulation in High Speed Cutting 
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    在分離式Hopkinson壓桿實驗（SHPB）和準(zhǔn)靜態(tài)壓縮實驗裝置上對鋁合金6061-T6進(jìn)行了高溫（20~500℃）高應(yīng)變率（達(dá)104/s）下的動、靜態(tài)力學(xué)性能實驗，在獲得應(yīng)變強(qiáng)化,、應(yīng)變率強(qiáng)化和熱軟化效應(yīng)曲線的基礎(chǔ)上,，修正了經(jīng)典的JC(Johnson-Cook)方程,，并在仿真模型中驗證了所得MJC方程的有效性,。研究表明：鋁合金6061-T6材料流變應(yīng)力隨應(yīng)變和應(yīng)變率的升高而升高，隨變形溫度升高而降低,；提出的JC修正方程較JC方程具有更高的本構(gòu)關(guān)系描述精度,；所獲得的鋁合金6061-T6材料本構(gòu)方程，為該材料高速切削物理仿真提供了精確的動,、靜態(tài)材料模型參數(shù),。

    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.

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徐道春,馮平法,郁鼎文,吳志軍.鋁合金6061-T6高速切削物理仿真材料本構(gòu)模型[J].農(nóng)業(yè)機(jī)械學(xué)報,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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  • 在線發(fā)布日期: 2012-12-13
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