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首页> 外文期刊>Journal of Materials Research >Effects of applied strain on pileup morphology during quasi-static and dynamic nanoindentation of cyclic olefin copolymers
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Effects of applied strain on pileup morphology during quasi-static and dynamic nanoindentation of cyclic olefin copolymers

机译：应变对环烯烃共聚物准静态和动态纳米压痕过程中堆积形态的影响

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摘要

The local micromechanical properties of two cyclic olefin copolymers (COCs) under an applied strain were measured using quasi-static (QS) and dynamic nanoindentation. Samples were prepared by compression molding and tested at five various applied strain levels, leading to a variation in pileup around the residual indentation impression. The variation in the resulting pileup morphology and the subsequent perceived changes in modulus and hardness as a function of applied strain was quantified for these COCs. The perceived mechanical properties determined using both QS and dynamic tests were influenced by the relative out of plane deformation, and as such provide a method to map local variations in residual stresses and strains without the need to measure residual impression pileup for each indentation. The dynamically measured properties appear to provide a more consistent correlation with both the applied strain and pile up behavior around the indents than the modulus and hardness determined from QS nanoindentation.
机译：使用准静态（QS）和动态纳米压痕测量了两种环状烯烃共聚物（COC）在施加应变下的局部微机械性能。通过压缩成型制备样品，并在五种不同的施加应变水平下进行测试，从而导致残留压痕周围堆积的变化。对于这些COC，量化了所得堆积形态的变化以及随后的模量和硬度随施加应变的变化。使用QS和动态测试确定的可感知机械性能受相对于平面外变形的影响，因此，它提供了一种方法来绘制残余应力和应变的局部变化，而无需测量每个压痕的残余压痕堆积。动态测量的性能似乎提供了与在压痕周围施加的应变和堆积行为相比更一致的相关性，而不是根据QS纳米压痕确定的模量和硬度。

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  • 来源
    《Journal of Materials Research》 |2015年第11期|1779-1787|共9页
  • 作者

    Nannan Tian; David F. Bahr;

  • 作者单位

    School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2045, USA;

    School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2045, USA;

  • 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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  • 正文语种 eng
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