Investigation of the fracture process zone and behavior of the macro-scale fatigue cracks in brittle rock specimens

ERARSLAN Nazife

doi:10.16285/j.rsm.2022.00244

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Investigation of the fracture process zone and behavior of the macro-scale fatigue cracks in brittle rock specimens

更新时间：2026-06-25

- Investigation of the fracture process zone and behavior of the macro-scale fatigue cracks in brittle rock specimens
- Vol. 44, Issue 7, Pages: 2041-2049(2023)
- 作者机构：
  
  1. 伊兹密尔民主大学土木工程系,伊兹密尔,土耳其,35140
  2. 昆士兰大学土木工程学院,昆士兰,布里斯班,澳大利亚,4072
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2022.00244
  CLC： TU45
- Online First：16 July 2023，
  
  Published：2023
- 稿件说明：
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ERARSLAN Nazife. Investigation of the fracture process zone and behavior of the macro-scale fatigue cracks in brittle rock specimens[J]. 2023, 44(7): 2041-2049.
DOI：

ERARSLAN Nazife. Investigation of the fracture process zone and behavior of the macro-scale fatigue cracks in brittle rock specimens[J]. 2023, 44(7): 2041-2049. DOI： 10.16285/j.rsm.2022.00244.

摘要

通过脆性岩石试样巴西圆盘试验研究了疲劳效应对脆性岩石断裂韧度KIC的影响，阐释了脆性岩石的疲劳损伤机制，首次展示了脆性岩石破坏前宏观裂纹的张开和闭合行为。巴西圆盘试验结果表明，循环荷载作用下，脆性岩样的KIC降低了35%，巴西劈裂拉伸强度降低了30%。通过高速相机数小时的记录观测到了岩石力学领域从未观测到的过程，即脆性岩样破坏前，疲劳裂纹在正弦荷载作用下弹性张合。扫描电镜和计算机断层扫描结果显示，巴西圆盘和V形切槽巴西圆盘试样的破坏是由断裂过程区（fracture process zone，简称FPZ）引起的，FPZ中包含许多异于循环荷载作用下单条宏观裂纹的微裂纹，切槽裂纹尖端FPZ的形成导致未破坏脆性岩样中可视疲劳裂纹弹性张合。室内试验和数值计算结果表明，切槽裂纹倾角为60º时获得最大FPZ（即FPZ），这表明最大FPZ的形成可能与I-II型（拉伸和剪切）组合加载模式有关。

Abstract

The importance of this study is to explain the fatigue damage mechanism while addressing the effect of fatigue on the fracture toughness (KIC) using the brittle Brazilian specimens and to show for the first time in the literature the behavior of macroscale cracks that open and close in brittle rock without leading to eventual failure. The KIC was reduced by 35% due to the cyclic loading

and the reduction of the indirect Brazilian strength was found to be reduced by 30%. The fatigue cracks were observed to open and close elastically without failure and have been recorded by a camera for hours in brittle rock specimens with sinusoidal loading for the first time in the rock mechanics field in this study. The findings of the scanning electron microscope (SEM) and computed tomography (CT) revealed that the failure of the Brazilian disc and chevron crack notched Brazilian disc (CCNBD) specimens was caused by the formation of the fracture process zone (FPZ)

which included many microcracks rather than a single macrocrack propagation during the cyclic loading tests. Moreover

SEM and CT findings indicated the FPZ took place ahead of the kerf crack tip

leading to the visible fatigue crack opening and closing elastically in brittle rock specimens without any rupture. According to the experimental and numerical analysis results

the FPZ could be obtained with the 60º inclined notch crack. This demonstrates the maximum FPZ development possible with combined mode I-II (tensile and shear) loading.

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