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首页> 外文期刊>Journal of Materials Engineering and Performance >Analysis of Indentation-Derived Power-Law Creep Response
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Analysis of Indentation-Derived Power-Law Creep Response

机译：压痕动力律蠕变响应分析

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摘要

The use of instrumented indentation to characterize power-law creep is studied by computational modeling. Systematic finite element analyses were conducted to examine how indentation creep tests can be employed to retrieve the steady-state creep parameters pertaining to regular uniaxial loading. The constant indentation load hold and constant indentation-strain-rate methods were considered, first using tin (Sn)-based materials as a model system. The simulated indentation-strain rate-creep stress relations were compared against the uniaxial counterparts serving as model input. It was found that the constant indentation-strain-rate method can help establish steady-state creep, and leads to a more uniform behavior than the constant-load hold method. An expanded parametric analysis was then performed using the constant indentation-strain-rate method, taking into account a wide range of possible power-law creep parameters. The indentation technique was found to give rise to accurate stress exponents, and a certain trend for the ratio between indentation strain rate and uniaxial strain rate was identified. A contour-map representation of the findings serves as practical guidance for determining the uniaxial power-law creep response based on the indentation technique.
机译：通过计算建模研究了使用仪器压痕来表征幂律蠕变。进行了系统的有限元分析，以检查压痕蠕变测试如何可以用来检索与规则单轴载荷有关的稳态蠕变参数。考虑了恒定压痕载荷保持和恒定压痕应变率方法，首先使用锡（Sn）基材料作为模型系统。将模拟的压痕-应变率-蠕变应力关系与作为模型输入的单轴对应物进行了比较。已经发现，恒定压痕应变率方法可以帮助建立稳态蠕变，并且比恒定载荷保持方法导致更均匀的行为。然后使用恒定压痕-应变率方法进行了扩展的参数分析，同时考虑了各种可能的幂律蠕变参数。发现压痕技术可以产生精确的应力指数，并且确定了压痕应变率与单轴应变率之比的一定趋势。研究结果的等值线图表示法可作为基于压痕技术确定单轴幂律蠕变响应的实用指南。

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