Volume 38 Issue 3
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JOURNAL OF MECHANICAL ENGINEERING  > 2022  >  38(3): 121300.
P. Wang, Z. Liu, D. Xie, S. Qu, Z. Zhuang, and D. Zhang,Probing the constitutive behavior of microcrystals by analyzing the dynamics of the micromechanical testing system. Acta Mech. Sin., 2022, 38, http://www.w3.org/1999/xlink' xlink:href='https://doi.org/10.1007/s10409-021-09077-5'>https://doi.org/10.1007/s10409-021-09077-5
Citation: P. Wang, Z. Liu, D. Xie, S. Qu, Z. Zhuang, and D. Zhang,Probing the constitutive behavior of microcrystals by analyzing the dynamics of the micromechanical testing system. Acta Mech. Sin., 2022, 38, http://www.w3.org/1999/xlink" xlink:href="https://doi.org/10.1007/s10409-021-09077-5">https://doi.org/10.1007/s10409-021-09077-5
shu

Probing the constitutive behavior of microcrystals by analyzing the dynamics of the micromechanical testing system

doi: 10.1007/s10409-021-09077-5
  • 1.

    Applied Mechanics Laboratory, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;

  • 2.

    Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;

  • 3.

    State Key Laboratory of Fluid Power & Mechatronic System, Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province,Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China

Funds:

the National Natural Science Foundation of China Grant

the Fundamental Research Funds for the Central Universities Grant

and the China Postdoctoral Science Foundation Grant

More Information
    Abstract
  • The constitutive behavior of microcrystals remains mysterious since very little, or no information regarding plastic deformation in the measured stress-strain curve is available due to plastic instability. Furthermore, the measured stress-strain curves vary greatly under different control modes, while constitutive behavior should remain unaffected by test methods. Beyond these reasons, probing the real constitutive behavior of microcrystals has long been a challenge because the nonlinear dynamical behaviors of micromechanical testing systems are unclear. Here, we perform and carefully analyze the experiments on single-crystal aluminum micropillars under displacement control and load control. To interpret these experimental results, a lumped-parameter physical model based on the principle of micromechanical testing is developed, which can directly relate nonlinear dynamics of the micromechanical testing system to the constitutive behavior of microcrystals. This reveals that some stages of the measured stress-strain curve attributed to the control algorithm are not related to constitutive behavior. By solving the nonlinear dynamics of the micromechanical testing system, intense plastic instability (large strain burst) starting from the equilibrium state is attributed to the strain-softening stage of microcrystals. Parametric studies are also performed to reduce the influence of plastic instability on the measured responses. This study provides critical insights for developing various constitutive models and designing a reliable micromechanical testing system.

     

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