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Mechanistic origin of high-cycle fatigue enhancement by grain refinement in AZ81 magnesium alloy for sports equipment. [PDF]
PLoS OneLi D, He L.
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Dynamic punching of holes in an aluminium pipe using impulsive hydraulic pressure
Journal of Materials Processing Technology, 1999Abstract An assembly using high-velocity impact of a plastic or steel projectile on a water chamber was designed for punching holes in the wall of a metal pipe. The impulsive hydraulic pressure obtained via high-velocity impact of the projectile was not sufficiently high to generate a strong shock wave, but the pressure was sufficient to punch some ...
Yasuhiro Nakiyama +2 more
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Fault Diagnosis Model for Hydraulic Punching Machine
Materials Science Forum, 2009A modeling method termed as the discrete time hybrid Diagnosis (DTHD) is presented to constructure models for a hydraulic punching machine. The DTHD method is an extension of the works on FDD (the fault detection and diagnosis) which are based on FSM-based modeling.
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Arabian Journal of Geosciences, 2019
In low permeability and soft coal seams, the boreholes are often blocked due to the rheology of coal, which leads to low flow and gas concentrations. Therefore, additional measures are needed to artificially increase the permeability of coal seams, such as hydraulic flushing.
Liguo Wang, Yanpeng Xu
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In low permeability and soft coal seams, the boreholes are often blocked due to the rheology of coal, which leads to low flow and gas concentrations. Therefore, additional measures are needed to artificially increase the permeability of coal seams, such as hydraulic flushing.
Liguo Wang, Yanpeng Xu
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Arabian Journal of Geosciences, 2021
As shallow coal resources deplete in industrialized nations, mining operations expand to the deeper resources to meet the requirements of the society. Deep coal seams in China have the characteristics of high gas pressure and high gas content. There is a persistent track record of gas-related accidents in Chinese coal mines.
Liguo Wang +2 more
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As shallow coal resources deplete in industrialized nations, mining operations expand to the deeper resources to meet the requirements of the society. Deep coal seams in China have the characteristics of high gas pressure and high gas content. There is a persistent track record of gas-related accidents in Chinese coal mines.
Liguo Wang +2 more
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QA35Y-16 hydraulic combined punching & shearing machine design
2012 2nd International Conference on Consumer Electronics, Communications and Networks (CECNet), 2012A new QA35Y-16 hydraulic combined punching & shearing machine has designed. The shearing mechanism has been analyzed and established mathematical model between size and motion parameters. The machine can be realized the parametric design by to solve nonlinear equations. It's simpler with the same power and structure, the shearing width increase of 37.5%
Nian Hu, Qingsong Yan
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Arabian Journal of Geosciences, 2020
Punching-induced cover-collapse sinkholes occur rapidly, and multiple collapses occur simultaneously compared with those caused by other common factors, such as pumping, rainstorms and mining. Erosion cannot explain the formation of this type of collapse entirely.
Yan Meng, Long Jia, Jia Long
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Punching-induced cover-collapse sinkholes occur rapidly, and multiple collapses occur simultaneously compared with those caused by other common factors, such as pumping, rainstorms and mining. Erosion cannot explain the formation of this type of collapse entirely.
Yan Meng, Long Jia, Jia Long
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Physics of Fluids
With the gradual increase in China's coal mining depth, coal seams exhibit high gas content, high gas pressure, and low permeability, exacerbating the difficulty of gas drainage. Hydraulic punching has become an effective means to improve the efficiency of coal seam gas drainage by relieving pressure and increasing permeability in coal seams.
Zhaofeng Wang +2 more
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With the gradual increase in China's coal mining depth, coal seams exhibit high gas content, high gas pressure, and low permeability, exacerbating the difficulty of gas drainage. Hydraulic punching has become an effective means to improve the efficiency of coal seam gas drainage by relieving pressure and increasing permeability in coal seams.
Zhaofeng Wang +2 more
exaly +2 more sources