Experimental and Numerical Indentation Tests to Study the Crack Growth Properties Caused by Various Indenters Under High Temperature

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-11-05 DOI:10.1002/nag.3885
Vahab Sarfarazi, Hadi Haeri, Jinwei Fu, Amir Namdarmanesh, Gholamreza Saeedi, Naser Golsanami
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Abstract

This paper investigates the influence of indenter shape and rock texture on the crack growth properties and rock hardness. For this purpose, two different rock specimens such as basalt and marble with various textures were prepared and tested by Vickers indentation hardness device with rhombus indenter shape under two different temperatures of 35°C and 100°C. Concurrent with the experimental test, Vickers indentation simulations have been done on three calibrated rock models with nine different indenter shapes. The tensile strength of marble was 8 MPa, while basalt had a tensile strength of 10.8 MPa. Regarding compressive strength, marble exhibited 71 MPa, whereas basalt had a compressive strength of 153 MPa. Marble and basalt had elastic moduli of 45 and 95 GPa, respectively. The physical loading was applied vertically at a rate of 0.004 mm/min. The rock's texture and temperature significantly impact Vickers indentation hardness. Penetration by the Vickers indenter creates an elastic‐plastic stress field, leading to radial cracks due to exceeding the critical stress level. Ring cracks are caused by bulging of the test material and nested cracks directly under the indentation due to high shear and bending stresses in the region. The indentation shape affected the extent of the damage zone below it, leading to increased crack growth with smaller indentation diameters. The radial fracture number increased when the cross‐section changed from circular to quadrilateral shape. The crack growth and damage zone area increased with higher rock temperature due to increased rock brittleness.
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通过实验和数值压痕试验研究高温下各种压痕引起的裂纹生长特性
本文研究了压头形状和岩石质地对裂纹生长特性和岩石硬度的影响。为此,我们制备了两种不同质地的岩石试样,如玄武岩和大理石,并在 35°C 和 100°C 两种不同温度下使用菱形压头的维氏硬度仪进行测试。在进行实验测试的同时,还对三种校准过的岩石模型进行了维氏压痕模拟,模拟了九种不同的压头形状。大理石的抗拉强度为 8 兆帕,而玄武岩的抗拉强度为 10.8 兆帕。在抗压强度方面,大理石的抗压强度为 71 兆帕,而玄武岩的抗压强度为 153 兆帕。大理石和玄武岩的弹性模量分别为 45 和 95 GPa。物理加载以 0.004 毫米/分钟的速度垂直施加。岩石的质地和温度对维氏硬度的影响很大。维氏压头的穿透会产生弹塑性应力场,超过临界应力水平会导致径向裂纹。环状裂纹是由测试材料的隆起和压痕正下方的嵌套裂纹引起的,原因是该区域的剪切应力和弯曲应力较大。压痕形状会影响其下方破坏区的范围,导致压痕直径越小,裂纹增长越快。当横截面从圆形变为四边形时,径向断裂数增加。由于岩石脆性增加,随着岩石温度升高,裂纹增长和破坏区面积也随之增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
期刊最新文献
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