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首页> 外文期刊>Journal of Materials Research >Effect of surface detection error due to elastic-plastic deformation on nanoindentation measurements of elastic modulus and hardness
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Effect of surface detection error due to elastic-plastic deformation on nanoindentation measurements of elastic modulus and hardness

机译：表面检测误差对弹性模量和硬度纳米狭窄测量弹性变形的影响

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摘要

Elastic modulus and hardness are commonly measured using nanoindentation. Calculating these properties from measured force-displacement curves typically requires knowledge of the contact depth of the indenter into the specimen. However, surface detection methods in many nanoindentation experiments can lead to an error in the contact depth measurement and, subsequently, the measured properties. Here, the contributions of elastic and plastic deformations to surface detection errors in nanoindentation experiments are examined through experiments and modeling. The model is used to quantify errors in elastic modulus and hardness measurements due to elastic-plastic deformation during surface detection as a function of the specimen properties, indenter geometry, preload, and contact depth. Nanoindentation measurements on polystyrene, an aluminum alloy, and fused silica specimens with a Berkovich indenter are used to illustrate the effects of surface detection error and are compared to the model. The experiments and model both demonstrate that surface detection error can lead to measurement of apparent depth-dependent properties in homogenous materials.
机译：使用纳米凸缘通常测量弹性模量和硬度。从测量的力 - 位移曲线计算这些性质通常需要了解压痕进入样本的接触深度。然而，许多纳米狭窄实验中的表面检测方法可以导致接触深度测量中的误差，随后是测量的性质。这里，通过实验和建模检查了纳米狭窄实验中的弹性和塑性变形对表面检测误差的贡献。该模型用于量化弹性模量和硬度测量中的误差，由于表面检测期间的弹性塑性变形，作为样品特性，压痕几何，预载和接触深度的函数。用Berkovich压痕的聚苯乙烯，铝合金和熔融二氧化硅样本的纳米狭窄测量用于说明表面检测误差的影响，并与模型进行比较。实验和模型既表明，表面检测误差可能导致均质材料中表观深度依赖性的测量。

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  • 来源
    《Journal of Materials Research》 |2021年第11期|2176-2188|共13页
  • 作者

    Sage Fulco; Sarah Wolf; Joseph E. Jakes; Zahra Fakhraai; Kevin T. Turner;

  • 作者单位

    Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Philadelphia PA 19104 USA;

    Department of Chemistry University of Pennsylvania Philadelphia PA 19104 USA;

    Forest Biopolymers Science and Engineering Forest Products Laboratory USD A Forest Service One Gifford Pinchot Drive Madison WI53726 USA;

    Department of Chemistry University of Pennsylvania Philadelphia PA 19104 USA;

    Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Philadelphia PA 19104 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);
  • 原文格式 PDF
  • 正文语种 eng
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