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2. Study on dynamic crack initiation and propagation behavior of surrounding rock of adjacent roadway

Author

Yang Liyun, Zhang Fei, Chen Siyu, Hu Huanning, Wang Ziyang, and Lin Changyu

Subjects
impact load, caustics, crack propagation, stress intensity factor, numerical simulation, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712, Mining engineering. Metallurgy, TN1-997
Abstract

In order to study the mechanical behavior characteristics of dynamic crack initiation and propagation of surrounding rock of adjacent roadway under impact load, with the help of a new digital laser dynamic caustics experimental system, a rock-like medium material PMMA was used to make a double-section roadway model for impact tests, and the crack propagation simulation was carried out based on the ABAQUS numerical simulation platform. The results show that when the pre-crack deflection angle α of adjacent sections is 45°, 22. 5°, 0°, -22. 5°, -45°, the dynamic stress intensity factor are different when the cracks were initiated. The dynamic stress intensity factor change after crack initiation has a "platform section" with a duration of about 160 μs. When the right crack gradually moves away from the left cross-section, the crack propagation speed of left crack after initiation will increase. When the dynamic crack initiation and propagation of the double-section roadway, the adjacent sections will affect the dynamic stress intensity factor and propagation speed to a certain extent. When the tip of the right crack is close to the left crack, the latter's crack initiation toughness is reduced, that is, it is easier to crack.

Published
2021
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4. Determination of stress intensity factor of sharp V-notch under pure shear loading by the caustic method

Author

Hu Huanning, Liyun Yang, Song Ye, and Yuh J Chao

Subjects
Digital image correlation, Materials science, Characteristic length, business.industry, Isotropy, Pure shear, 01 natural sciences, Atomic and Molecular Physics, and Optics, Finite element method, 010309 optics, Stress (mechanics), Optics, 0103 physical sciences, Caustic (optics), Electrical and Electronic Engineering, Composite material, business, Engineering (miscellaneous), Stress intensity factor
Abstract

The caustic method has proven to be a useful optical method to determine stress intensity factors. This paper evaluates the stress intensity factors of a sharp V-notch under pure shear loading by the caustic method for isotropic materials. The elastic stress fields and caustics formation near the V-notch tip under pure shear loading are first introduced. The theoretical relationship between the stress intensity factor of the sharp V-notch and the characteristic length is derived. Then, the experiment on the V-notched polymethyl methacrylate specimens under pure shear loading is carried out to obtain the stress intensity factor with the derived caustic formulation. Finally, the present results obtained from caustics are compared to the results available in the literature. The good accuracy of the results obtained demonstrates the ability of the caustics method in the determination of the stress intensity factor of a sharp V-notch.

Published
2020

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