The artificial periodic lattice phase analysis method applied to deformation evaluation of TiNi shape memory alloy in micro scale

The artificial periodic lattice phase analysis method applied to deformation evaluation of TiNi shape memory alloy in micro scale
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人工周期晶格相分析方法应用于TiNi形状记忆合金微观尺度变形评估

DOI:
10.1088/0957-0233/22/12/125702
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发表时间:
2011-12
影响因子:
2.4
通讯作者:
Du, H.
Du, H.
中科院分区:
工程技术3区
文献类型:
--
作者:
Liu, Z. W.;Huang, X. F.;Xie, H. M.;Lou, X. H.;Du, H.

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介绍了基于人工周期晶格的人工周期晶格相分析方法的基本原理。改进的技术旨在从纳米级扩展到微观和宏观领域的实验力学的测试领域结合亚微米网格,这是由聚焦离子束(FIB)产生的。滤波后的图像经过快速傅里叶变换(FFT)和逆FFT后,可以得到相位信息。因此,面内位移场以及与相位信息相关的局部应变分布将被评估。通过模拟实验得出了该技术的适用范围。利用该方法计算了多孔TiNi形状记忆合金在微尺度压缩载荷作用下的位移场和应变分布。通过采用FIB在测试的平坦表面上直接制造试样网格。揭示了孔隙附近微区剪切带的演化规律。结果表明,该技术不仅可以很好地应用于全场变形的测量,而且更重要的是,可以在微观尺度上呈现力学性能。
The basic principle of the artificial periodic lattice phase analysis method on the basis of an artificial periodic lattice was thoroughly introduced in this investigation. The improved technique is intended to expand from nanoscale to micro- and macroscopic realms on the test field of experimental mechanics in combination with a submicron grid, which is produced by a focused ion beam (FIB). Phase information can be obtained from the filtered images after fast Fourier transform (FFT) and inverse FFT. Thus, the in-plane displacement fields as well as the local strain distributions related to the phase information will be evaluated. The application scope of the technique was obtained by the simulation experiment. The displacement fields as well as strain distributions of porous TiNi shape memory alloy were calculated by the technique after compressive loading in micro scale. The specimen grid was directly fabricated on the tested flat surface by employing a FIB. The evolution rule of shear zones in micro area near porous has been discovered. The obtained results indicate that the technique not only could be well applied to measuring full field deformation, but also, more significantly, is available to present mechanical properties in micro scale.
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