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首页> 外文期刊>Journal of Materials Research >Crack growth behavior in an aluminum alloy under very low stress amplitudes
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Crack growth behavior in an aluminum alloy under very low stress amplitudes

机译：在非常低的应力振幅下铝合金的裂纹扩展行为

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摘要

The near-threshold behavior of long cracks is studied in this paper using precracked flat dogbone specimens of a commercial aluminum alloy in peak-aged and overaged conditions. After introducing the initial crack in compression precracking, the crack was propagated approximately with the constant range of the stress intensity factor at values just above or below the corresponding threshold values. It was found that there were two major mechanisms which kept the crack from continuous extension. First, the crack front was pinned by primary precipitates. This effect was rather pronounced and lead to significant kinking in the crack front and ductile ridges on the fracture surface. The second mechanism was shear-controlled crack extension of very long cracks with plastic zones ahead of the crack tip, very similar to stage-I small cracks. Interaction with primary precipitates deflected the shear-controlled cracks but did not change the crack extension mode.
机译：本文使用商品铝合金在峰值时效和超时效条件下的预裂平狗骨标本研究了长裂纹的近阈值行为。在将初始裂纹引入压缩预裂纹后，裂纹以应力强度因子的恒定范围近似在相应的阈值之上或之下传播。结果发现，有两种主要的机制可以防止裂纹连续扩展。首先，裂纹前沿被主要的析出物钉住。这种效果相当明显，并导致裂纹前缘和断裂表面的韧性脊明显扭结。第二种机制是剪切控制的非常长的裂纹的扩展，在裂纹尖端处有塑性区，这与第一阶段小裂纹非常相似。与初次析出物的相互作用使剪切控制的裂纹偏转，但没有改变裂纹扩展方式。

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  • 来源
    《Journal of Materials Research》 |2017年第23期|4354-4361|共8页
  • 作者

    Tobias Stein; Marcel Wicke; Angelika Brueckner-Foit; Tina Kirsten; Martina Zimmermann; Fatih Buelbuel; Hans-Juergen Christ;

  • 作者单位

    Institute for Materials Engineering, University of Kassel, Kassel D-34125, Germany;

    Institute for Materials Engineering, University of Kassel, Kassel D-34125, Germany;

    Institute for Materials Engineering, University of Kassel, Kassel D-34125, Germany;

    Institute for Materials Engineering, Technical University of Dresden, Dresden D-01069, Germany;

    Institute for Materials Engineering, Technical University of Dresden, Dresden D-01069, Germany;

    Institute for Materials Engineering, University of Siegen, Siegen D-57068, Germany;

    Institute for Materials Engineering, University of Siegen, Siegen D-57068, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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