Stress Distribution and Dynamic Evolution of Coal Surface Under a Single Droplet of Discrete Water Jet.
Saved in:
| Title: | Stress Distribution and Dynamic Evolution of Coal Surface Under a Single Droplet of Discrete Water Jet. |
|---|---|
| Authors: | Yuan, Man1,2 (AUTHOR), Zhao, Xun3 (AUTHOR), Jiang, Mingjun1,2 (AUTHOR), Liu, Yingke1,2 (AUTHOR) ykliu@cumt.edu.cn, Wang, Fengchao4 (AUTHOR), Yang, Tengrui2 (AUTHOR), Yin, Lingxiao2 (AUTHOR), Wen, XiaoJiang1,2 (AUTHOR) |
| Source: | Rock Mechanics & Rock Engineering. Dec2024, Vol. 57 Issue 12, p10533-10549. 17p. |
| Subjects: | Stress concentration, Radial stresses, Water distribution, Time pressure, Call centers |
| Abstract: | The morphology of the water jet in the far field is a discrete flow consisting of multiple disorganized discrete single droplets. However, the stress distribution and dynamic evolution of the coal surface under the impact of a single droplet is still unclear, which makes it difficult to obtain the key factors affecting the coal stress. In this paper, a mathematical model for coal surface stress distribution and dynamic evolution under single droplet impact was established, the stress concentration characteristics and the key affecting factors of coal surface were studied, and the synergistic effects of these factors on the stress distribution and damage characteristics were explored. The results show that the impact velocity of the droplet is the main controlling factor in determining the coal surface's stress distribution and dynamic evolution. The principal stresses are concentrated by compressive stress in the center of the droplet-coal contact area, and the radial stress is concentrated by tensile stress in the edge of the contact area. The principal stresses have the same evolutionary trend with time and the stress attenuation decreases with increasing distance between the material point and the center of the contact area. The droplet's impact velocity and the Poisson's ratio of coal synergistically affect the stress distribution and damage on the coal surface by changing the value of the principal stresses and the proportionality between the principal stresses, respectively. The results lay a theoretical foundation for clarifying the parameter adjustment and the coal damage mechanism under discrete flow impact. Highlights: A mathematical model for surface stress distribution and dynamic evolution of coal under single droplet impact is established. Stress concentration characteristics of coal surface under single droplet impact are revealed. The impact velocity of the droplet affects the stress distribution and damage on the coal surface by changing the value of the principal stresses. The Poisson's ratio of coal affects the stress distribution and damage on the coal surface by changing the proportionality between the principal stresses. [ABSTRACT FROM AUTHOR] |
| Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | The morphology of the water jet in the far field is a discrete flow consisting of multiple disorganized discrete single droplets. However, the stress distribution and dynamic evolution of the coal surface under the impact of a single droplet is still unclear, which makes it difficult to obtain the key factors affecting the coal stress. In this paper, a mathematical model for coal surface stress distribution and dynamic evolution under single droplet impact was established, the stress concentration characteristics and the key affecting factors of coal surface were studied, and the synergistic effects of these factors on the stress distribution and damage characteristics were explored. The results show that the impact velocity of the droplet is the main controlling factor in determining the coal surface's stress distribution and dynamic evolution. The principal stresses are concentrated by compressive stress in the center of the droplet-coal contact area, and the radial stress is concentrated by tensile stress in the edge of the contact area. The principal stresses have the same evolutionary trend with time and the stress attenuation decreases with increasing distance between the material point and the center of the contact area. The droplet's impact velocity and the Poisson's ratio of coal synergistically affect the stress distribution and damage on the coal surface by changing the value of the principal stresses and the proportionality between the principal stresses, respectively. The results lay a theoretical foundation for clarifying the parameter adjustment and the coal damage mechanism under discrete flow impact. Highlights: A mathematical model for surface stress distribution and dynamic evolution of coal under single droplet impact is established. Stress concentration characteristics of coal surface under single droplet impact are revealed. The impact velocity of the droplet affects the stress distribution and damage on the coal surface by changing the value of the principal stresses. The Poisson's ratio of coal affects the stress distribution and damage on the coal surface by changing the proportionality between the principal stresses. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 07232632 |
| DOI: | 10.1007/s00603-024-04086-z |
