Investigation of the fracture characteristics of mixed-mode I/III crack by using two kinds of sandstone specimens

被引：5

作者：

Shui, Xin ^{[1
]}

Zhou, Lei ^{[1
]}

Zhu, Zheming ^{[1
]}

Nie, Fukuan ^{[1
]}

Wang, Haohan ^{[1
]}

Zhang, Hongdan ^{[1
]}

机构：

[1] Sichuan Univ, Coll Architecture & Environm, State Key Lab Intelligent Construct & Hlth Operat, Chengdu 610065, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2024年 / 310卷

基金：

中国国家自然科学基金;

关键词：

I/III mixed-mode; Single-edge notch bending; Edge-notched disc bend; Fracture toughness; Failure patterns; TOUGHNESS DETERMINATION; HMA MIXTURES; BEHAVIOR; TESTS; ROCKS;

D O I：

10.1016/j.engfracmech.2024.110488

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This study aims to identify specimens that are more suitable for examining the failure properties of I/III mixed-mode cracks under static loads. We employed single-edge notched bending (SENB) and edge-notched disc bending (ENDB) specimens, and used ABAQUS finite element method software to calculate the stress intensity factors for modes I and III at various crack inclination angles theta . Fracture toughness was tested using three-point bending experiments on two types of sandstone specimens. The evolution of mixed-mode I/III fracture morphology and failure patterns was investigated with a monocular microscope. Additionally, the evolution of the strain field and crack tip opening displacement was analyzed using the digital image correlation method. Our findings indicate that the fracture toughness of the ENDB specimens surpassed that of the SENB specimens. The effective fracture toughness of both SENB and ENDB specimens initially increased with crack inclination angle theta but then decreased. The fracture mode correlated with energy release; the energy release rate of the ENDB specimens exceeded that of the SENB specimens, making the former more brittle. For SENB specimens, crack initiation was primarily intergranular, while ENDB specimens exhibited predominantly transgranular fractures. The crack initiation moments for both specimen types increased with higher crack inclination angles. Furthermore, at the same crack inclination angle, ENDB specimens cracked earlier than SENB specimens.

引用

页数：19