宽应变率范围下2A16-T4铝合金动态力学性能

惠旭龙 白春玉 刘小川 牟让科 王计真

惠旭龙, 白春玉, 刘小川, 牟让科, 王计真. 宽应变率范围下2A16-T4铝合金动态力学性能[J]. 爆炸与冲击, 2017, 37(5): 871-878. doi: 10.11883/1001-1455(2017)05-0871-08
引用本文: 惠旭龙, 白春玉, 刘小川, 牟让科, 王计真. 宽应变率范围下2A16-T4铝合金动态力学性能[J]. 爆炸与冲击, 2017, 37(5): 871-878. doi: 10.11883/1001-1455(2017)05-0871-08
Xi Xulong, Bai Chunyu, Liu Xiaochuan, Mu Rangke, Wang Jizhen. Dynamic mechanical properties of 2A16-T4 aluminum alloy at wide-ranging strain rates[J]. Explosion And Shock Waves, 2017, 37(5): 871-878. doi: 10.11883/1001-1455(2017)05-0871-08
Citation: Xi Xulong, Bai Chunyu, Liu Xiaochuan, Mu Rangke, Wang Jizhen. Dynamic mechanical properties of 2A16-T4 aluminum alloy at wide-ranging strain rates[J]. Explosion And Shock Waves, 2017, 37(5): 871-878. doi: 10.11883/1001-1455(2017)05-0871-08

宽应变率范围下2A16-T4铝合金动态力学性能

doi: 10.11883/1001-1455(2017)05-0871-08
详细信息
    作者简介:

    惠旭龙(1989—),男,硕士,助理工程师, 742839400@qq.com

  • 中图分类号: O347.1

Dynamic mechanical properties of 2A16-T4 aluminum alloy at wide-ranging strain rates

  • 摘要: 为了研究2A16-T4铝合金的动态力学性能,利用电子万能试验机、高速液压伺服试验机及霍普金森压杆(SHPB)装置进行常温下准静态、中应变率和高应变率的动态力学性能实验,得到不同应变率下的应力应变曲线,基于修正的Johnson-Cook本构模型对它进行拟合,并分析材料中应变率力学特性对模型应变率敏感参量的影响。结果表明:2A16-T4铝合金在应变率10-4~102 s-1范围内应变率敏感性较弱,而在102~103 s-1范围内应变率敏感性较强,且应变率强化效应随塑性应变的增大而减小;同时,在10-4~103 s-1范围内具有较强的应变硬化效应,且应变硬化效应随应变率的增大而减小;此外,修正Johnson-Cook本构模型的拟合结果与实验结果吻合很好,能够很好表征材料的动态力学行为,且考虑材料中应变率力学特性可提高本构模型参量的准确性。
  • 图  1  电子万能试验机

    Figure  1.  INSTRON 8801 test system

    图  2  真实应力应变曲线

    Figure  2.  True stress-strain curve

    图  3  准静态下试件破坏结果

    Figure  3.  Failure results in quasi-static state

    图  4  高速液压伺服试验机

    Figure  4.  INSTRON VHS 160 test system

    图  5  非接触分析系统

    Figure  5.  DIC system

    图  6  试件表面应变场

    Figure  6.  Strain field of specimen's surface

    图  7  动态拉伸应变结果

    Figure  7.  Strain result of dynamic tensile process

    图  8  载荷间接测试方法

    Figure  8.  Indirect loading measurement

    图  9  真实塑性应力应变曲线

    Figure  9.  True plastic stress-strain curves

    图  10  流动应力与应变率的关系

    Figure  10.  Relation of flow stress with strain rates

    图  11  试件拉伸破坏结果

    Figure  11.  Failure result of specimen

    图  12  SHPB装置

    Figure  12.  SHPB setup

    图  13  真实塑性应力应变曲线

    Figure  13.  True plastic stress-strain curves

    图  14  流动应力与应变率的关系

    Figure  14.  Flow stress vs strain rate

    图  15  材料流动应力与应变率关系

    Figure  15.  Relation of flow stress with strain rates

    图  16  2A16-T4铝合金应变率敏感性拟合结果与实验结果对比

    Figure  16.  Comparison of fitted results of Johnson-Cook model with experiment results for 2A16-T4

    图  17  外推结果与实验结果的对比

    Figure  17.  Comparison of extrapolated results with experimental results

    图  18  拟合结果与实验结果的对比

    Figure  18.  Comparison of fitted results with experimental results

    表  1  2A16-T4铝合金应变率参数拟合结果

    Table  1.   Fitted results of strain rate sensitive parameters

    情况 C P C P C P ${\bar{C}} $ ${\bar{P}} $
    ε=0.03 ε=0.08 ε=0.12
    1 2.3×10-3 1.29 1.80×10-3 1.04 1.20×10-3 0.95 1.77×10-3 1.093
    2 4.9×10-9 6.69 4.75×10-9 6.60 4.72×10-9 6.55 4.79×10-9 6.630
    3 1.9×10-11 8.71 1.82×10-11 8.63 1.78×10-11 8.58 1.83×10-11 8.660
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出版历程
  • 收稿日期:  2016-02-02
  • 修回日期:  2016-08-13
  • 刊出日期:  2017-09-25

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