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首页> 外文学位 >Determination de la resistance en compression uniaxiale et du module d'elasticite d'un materiau poreux a l'aide d'un essai de poinconnement.
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Determination de la resistance en compression uniaxiale et du module d'elasticite d'un materiau poreux a l'aide d'un essai de poinconnement.

机译：使用冲压试验确定多孔材料的单轴抗压强度和弹性模量。

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摘要

The purpose of this research is to verify the applicability, on a very porous and ductile material, of an indentation test that can estimate the Young's modulus and the uniaxial compressive strength. A parameter, the module d'enfoncement permanent (MEP), is presented in this research for the purpose of establishing a possible correlation between indentation test results and uniaxial compressive strength determined by standard test methods.;The proposed test method implies cyclic loading using a constant load increment throughout the test procedure. In this manner indentor penetration can be analyzed in its elastic and plastic components. The Young's modulus is obtained by calculating the average secant modulus of the unloading part of the load-penetration curve while the unconfined compressive strength is determined by a model of interpretation that makes use of the permanent penetration caused by indentor loading. The permanent penetration modulus (MEP) is presented in this research as a mean to properly estimate the unconfined compressive strength of rock by resorting mainly on indentor geometry and its permanent penetration.;A laboratory test program consisting in 214 indentation tests and 39 unconfined compressive tests was performed on a material for which the porosity would range from 40% to 70%. Good agreement between the unconfined compressive strength results determined by both conventional and indentation tests was found. The ratio between MEP and unconfined compressive strength was practically constant for the range of porosity tested indicating a possible correlation. However the proposed indentation test tends to underestimate the Young's modulus in comparison to values obtained by the conventional method.
机译：这项研究的目的是验证一种压痕测试在非常多孔和易延展的材料上的适用性，该压痕测试可以估算杨氏模量和单轴抗压强度。为了确定压痕测试结果与标准测试方法确定的单轴抗压强度之间的可能关系，本研究提出了一个参数，即永久性永久模量（MEP）模块。在整个测试过程中保持恒定的载荷增量。通过这种方式，可以分析压头的弹性和塑性成分的渗透情况。杨氏模量是通过计算载荷-穿透曲线的卸载部分的平均正割模量而获得的，而无约束抗压强度是通过解释模型确定的，该模型利用了压头加载引起的永久性穿透。永久渗透模量（MEP）是本研究的一种手段，主要通过依靠压头的几何形状及其永久渗透来适当估计岩石的无侧限抗压强度;实验室测试程序包括214个压痕测试和39个无侧限抗压测试在孔隙率范围为40％至70％的材料上进行抛光。发现通过常规和压痕测试确定的无侧限抗压强度结果之间具有良好的一致性。在测试的孔隙率范围内，MEP与无侧限抗压强度之间的比率实际上是恒定的，表明可能存在相关性。然而，与通过常规方法获得的值相比，所提出的压痕测试倾向于低估杨氏模量。

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  • 作者

    Ferland, Francois.;

  • 作者单位

    Ecole Polytechnique, Montreal (Canada).;

  • 授予单位 Ecole Polytechnique, Montreal (Canada).;
  • 学科 Civil engineering.;Mechanical engineering.;Materials science.
  • 学位 M.Sc.A.
  • 年度 1999
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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