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Broadband nanoindentation of glassy polymers:Part Ⅱ. Viscoplasticity

机译：玻璃态聚合物的宽带纳米压痕：第二部分。黏塑性

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摘要

The relationship between hardness and flow stress in glassy polymers is examined. Materials studied include poly(methylmethacrylate), polystyrene, and polycarbonate. Properties are strongly rate dependent, so broadband nanoindentation creep (BNC) is used to measure hardness across a broad range of indentation strain rates (10~(-4) to 10 s~(-1)). Molybdenum (Mo) is also studied to serve as a "control" whose rate-dependent hardness properties have been measured previously and whose flow stress, unlike the polymers, is pressure insensitive. The BNC hardness data are converted to uniaxial flow stress using two methods based on the usual Tabor-Marsh-Johnson correlation. With both methods the resulting BNC-derived uniaxial flow stress data agree closely with literature compression uniaxial flow stress data for all materials. For the polymers, the BNC hardness data depend on initial rate of loading, indicating that the measured properties are path dependent. Path dependence is not detected in Mo.
机译：检查了玻璃状聚合物中硬度与流动应力之间的关系。研究的材料包括聚（甲基丙烯酸甲酯），聚苯乙烯和聚碳酸酯。由于性质与速率密切相关，因此宽带纳米压痕蠕变（BNC）用于测量压痕应变速率范围很广（10〜（-4）至10 s〜（-1））的硬度。还研究了钼（Mo）作为“对照”，它的速率相关硬度特性已被预先测量，并且其流动应力与聚合物不同，对压力不敏感。根据通常的Tabor-Marsh-Johnson相关性，使用两种方法将BNC硬度数据转换为单轴流动应力。通过这两种方法，得出的BNC派生的单轴流应力数据与所有材料的文献压缩单轴流应力数据非常吻合。对于聚合物，BNC硬度数据取决于初始加载速率，这表明测得的性能与路径有关。 Mo中未检测到路径依赖性。

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  • 来源
    《Journal of Materials Research》 |2012年第2期|p.475-484|共10页
  • 作者

    Joseph E. Jakes; Rod S. Lakes; Don S. Stone;

  • 作者单位

    Performance Enhanced Biopolymers, USDA Forest Service, Forest Products Laboratory, Madison, Wisconsin 53726 and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706;

    Department of Engineering Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706;

    Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin 53706 and Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706;

  • 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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