Results 41 to 50 of about 5,494,240 (282)

Unloading deterioration and mechanism of rock under different loading and unloading stress paths [PDF]

, 2022
In order to study the failure mechanism of deep coal seam floor under unloading, pseudo-triaxial mechanical tests were carried out under different loading and unloading stress paths.
Yujun ZHANG, Fengda ZHANG, Qiuge YU
core   +1 more source

Finite element based surface roughness study for ohmic contact of microswitches [PDF]

, 2012
Finite element method (FEM) is used to model ohmic contact in microswitches. A determinist approach is adopted, including atomic force microscope (AFM) scanning real contact surfaces and generating rough surfaces with three-dimensional mesh.
Colin, Stephane, Hong Liu, Dimitri Leray, Stéphane Colin, Liu, Hong, Patrick Pons, Leray, Dimitri, Liu, H., Pons, P., Broué, A., Adrien Broué, Broue, Adrien, Pons, Patrick   +12 more
core   +1 more source

Time-effect properties and mechanisms of marble failure under different unloading rates

Yantu gongcheng xuebao, 2017
In the process of tunnel excavation, the failure properties of rock mass are obviously affected by unloading rates, and the failure properties show a clear time effect.
LI Xi-bing 1, 2, CHEN Zheng-hong 1,2, CAO Wen-zhuo 1, 2, TAO Ming 1, 2, ZHOU Jian 1, 2
doaj   +1 more source

Rock strength and deformation characteristics under different unloading rates

Shuili Shuiyun Gongcheng Xuebao, 2020
The excavation of rock mass engineering is essentially the unloading process of rock mass, and different unloading rates will significantly affect the strength and deformation characteristics of rock mass, which is of great significance to the safety and
QIAN Yajun, WU Yingli, PEI Weiwei, ZHU Yueyan   +3 more
doaj   +1 more source

Investigation of the Shear Mechanical Behavior of Sandstone with Unloading Normal Stress after Freezing–Thawing Cycles

Machines, 2021
Freezing–thawing action has a great impact on the physical and mechanical deterioration processes of rock materials in cold areas where environmental changes are very complicated.
Shuailong Lian, Jiashen Li, Fei Gan, Jing Bi, Chaolin Wang, Kun Zheng   +5 more
doaj   +1 more source

Fractured samples after unloading with different unloading rate.

, 2019
Fractured samples after unloading with different unloading rate.
Lei Wang (6656), Xin Chang (741323), Yintong Guo (7827806)   +2 more
core   +1 more source

Effect of intermediate principal stress and minimum principal stress unloading stress path and rate on energy evolution of sandstone under true triaxial compression

Meitan xuebao
In the process of deep coal mining, the unloading stress path and unloading rate of deep rock are complicated and changeable due to the influence of excavation and unloading.
Zhixi LIU, Guangming ZHAO, Xiangrui MENG, Zhihong QIN   +3 more
doaj   +1 more source

Deformation and Failure Characteristics of Loading and Unloading Rock Based on Volume Crack Strain

Frontiers in Earth Science, 2022
In order to study the laws of crack evolution in rock and explain its fracture instability mechanism, a series of laboratory tests were carried out with Jinping Marbles.
Xiaohui Liu, Xiaohui Liu, Xiaohui Liu, Yu Zheng, Yu Zheng, Yu Zheng, Jinyun Guo, Qijun Hao, Yang Xue, Yang Xue   +9 more
doaj   +1 more source

Numerical Experimental Investigations of the Effect of Confining Pressure Unloading Rate on Sandstone Mechanical Properties

Taiyuan Ligong Daxue xuebao, 2023
Purposes This work is conducted to exclude the superimposed effect of natural rock specimen discreteness and multiple stress path conversion in test process on results, and to further investigate the influence mechanism of the confining pressure ...
Jian ZHANG, Liangliang GUO
doaj   +1 more source

Modelling Minimum Flow Rate Required for Unloading Liquid in Gas Wells [PDF]

SPE Nigeria Annual International Conference and Exhibition, 2020
Abstract Liquid loading in gas well has been an interest in the Oil and Gas sector due to the reduction of ultimate recovery and also the reduction of production from such wells. Several authors have presented various models for predicting the beginning of liquid loading in a gas well, yet there are regular errors in the model outcomes ...
Adesina Fadairo, Gbadegesin Adeyemi, Temitope Ogunkunle, Oreoluwa Lawal, Olugbenga Oredeko   +4 more
openaire   +1 more source