Effect of temperature on pure mode III fracture behavior and fracture morphology of granite after thermal shock

被引：19

作者：

Shi, Zhanming ^{[1
]}

Li, Jiangteng ^{[1
]}

Wang, Mengxiang ^{[1
]}

Tan, Han ^{[1
]}

Lin, Hang ^{[1
]}

Li, Kaihui ^{[1
]}

机构：

[1] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China

来源：

THEORETICAL AND APPLIED FRACTURE MECHANICS | 2023年 / 127卷

基金：

中国国家自然科学基金;

关键词：

Pure mode III fracture; Fracture morphology; Temperature; Fracture toughness; Fractal dimension; ROCK FRACTURE; TOUGHNESS;

D O I：

10.1016/j.tafmec.2023.104024

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

To investigate the effect of temperature on the pure mode III fracture behavior and fracture morphology of granite after thermal shock, edge-notched disc bend granite specimens are selected for heat treatment and a series of fracture tests. Firstly, the effect of temperature on the macroscopic fracture behavior of the rock is analyzed regarding the physical and mechanical properties and fracture toughness. Then, the impact of temperature on the microscopic fracture morphology of the rocks is discussed based on a fractal theory using 3D laser scanning techniques. The results show that temperature affects the fracture behavior of rock by changing its physical parameters and mechanical properties. High temperatures can change the fracture mode of rocks and have a softening effect on rocks. The heat treatment temperature of 325 & DEG;C above can convert rocks from brittle to ductile failure. When the heat treatment temperature is above 525 & DEG;C can evolve rocks from pure mode III fracture to mixed mode I/III fracture. The fracture toughness of the rock and the joint roughness coefficient are highly linearly correlated with temperature. The fracture toughness of the rock decreases by 0.5 MPa & BULL;m0.5, and the joint roughness coefficient increases by 1.7 for every 100 & DEG;C increase in temperature in the range of 25 & DEG;C to 625 & DEG;C. The asperity height and slope angle of the rock obey a normal distribution. The higher the temperature, the larger the fracture surface area, the larger the fractal dimension, the stronger the anisotropy of the surface protrusions, and the rougher the rock surface.

引用

页数：15

共 45 条

[1] Box-counting methods to directly estimate the fractal dimension of a rock surface [J].

Ai, T. ;

Zhang, R. ;

Zhou, H. W. ;

Pei, J. L. .

APPLIED SURFACE SCIENCE, 2014, 314 :610-621

[2] Fracture toughness determination of modified HMA mixtures with two novel disc shape configurations [J].

Aliha, M. R. M. ;

Sarbijan, M. J. ;

Bahmani, A. .

CONSTRUCTION AND BUILDING MATERIALS, 2017, 155 :789-799

[3] Rock Fracture Toughness Study Under Mixed Mode I/III Loading [J].

Aliha, M. R. M. ;

Bahmani, A. .

ROCK MECHANICS AND ROCK ENGINEERING, 2017, 50 (07) :1739-1751

[4] Determination of mode III fracture toughness for different materials using a new designed test configuration [J].

Aliha, M. R. M. ;

Bahmani, A. ;

Akhondi, Sh. .

MATERIALS & DESIGN, 2015, 86 :863-871

[5] Numerical analysis of a new mixed mode I/III fracture test specimen [J].

Aliha, M. R. M. ;

Bahmani, A. ;

Akhondi, Sh. .

ENGINEERING FRACTURE MECHANICS, 2015, 134 :95-110

[6] On the comparison of two mixed-mode I plus III fracture test specimens [J].

Bahmani, A. ;

Farahmand, F. ;

Janbaz, M. R. ;

Darbandi, A. H. ;

Ghesmati-Kucheki, H. ;

Aliha, M. R. M. .

ENGINEERING FRACTURE MECHANICS, 2021, 241

[7] Mixed mode I/III fracture parameters for edge-notched diametrically compressed disc specimen [J].

Bahmani A. ;

Farahmand F. ;

Ataei F. ;

Aliha M.R.M. .

Material Design and Processing Communications, 2019, 1 (06)

[8]

Bahrami B, 2022, ROCK MECH ROCK ENG, V55, P3353, DOI 10.1007/s00603-022-02809-8

[9] Theory and experiment on true mode II fracturing of rocks [J].

Bahrami, Bahador ;

Nejati, Morteza ;

Ayatollahi, Majid Reza ;

Driesner, Thomas .

ENGINEERING FRACTURE MECHANICS, 2020, 240

[10]

Barton N., 1977, Rock Mechanics, V10, P1, DOI 10.1007/BF01261801

← 1 2 3 4 5 →