Investigation of the microstructure damage and mechanical properties evolution of limestone subjected to high-pressure water

2022 ◽  
Vol 316 ◽  
pp. 125871
Author(s):  
Shengyuan Fan ◽  
Zhanping Song ◽  
Tian Xu ◽  
Yuwei Zhang
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Pressure Water

Deep Mining Optimization of Rock Burst Mines

2013 ◽  
Vol 448-453 ◽  
pp. 3859-3862
Author(s):  
Yong Mei
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Rock Burst ◽  
Water Injection ◽  
Coal Face ◽  
Deep Mining ◽  
Organization Model ◽  
Pressure Water ◽  
Injection Effect ◽  
System Layout

To prevent threaten of impact disaster, high-pressure water is injected into coal face, which is most widely used in impact-type mine. In such cases, by analyzing the rock burst tendency of a particular type of deep mining pit and occurrence of the mining process, rock samples drilled from the coal mine were taken for the conventional mechanical properties test and rock burst tendency test respectively under dry and wet state. Cuttings volume indicator affected by injection has been optimized to improve the prediction sensitivity. "One shift anti-impact, two-shift production "patterns labor organization model, adjusted development system layout and cut drilling index optimizations, as well as the allocation of high-pressure water injection drilling means, greatly improving the water injection effect, which probably provide a reference for similar mines to safe and efficiently mining.

Experimental Study on Enhancement of Steel Mechanical Properties by High Pressure Jet Quenching

2014 ◽  
Vol 893 ◽  
pp. 634-637
Author(s):  
Chia Hao Chang ◽  
Fang Zhou Lin ◽  
Zong Han Lee ◽  
Bo Han Wang ◽  
Rin Yo Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Test Sample ◽  
Jet Quenching ◽  
Metallographic Analysis ◽  
Quenching Process ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Martensite Microstructure ◽  
Martensite Structure

The purpose of this study is to enhance the strength of steel by increasing the percentage of martensite microstructure with a high pressure water jet quenching. JIS SS400 carbon steel was chosen as a test sample. The cooling rate of surface and center reached approximately 180oC/sec and 65oC/sec, respectively. After this quenching process, the metallographic analysis showed that the steel turned into martensite structure. Furthermore, the tensile strength of sample increased from 363MPa to 543MPa; the yielding strength increased from 284MPa to 420Mpa. In general, the overall enhancement of mechanical strength was about 140%.

scholarly journals Characterization of Cellulosic Fibres from Coconut Peduncle Leaf Stalk Fibres (CPLSF)

2021 ◽  
Vol 36 (1) ◽  
pp. 204-208
Author(s):  
Dr.M. Mohan Prasad ◽  
Dr.S. Padmavathy ◽  
P. Gowshick ◽  
P. Kavinkumar ◽  
O.A. Kishore
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Testing Machine ◽  
Distilled Water ◽  
Universal Testing ◽  
Naoh Solution ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Cellulosic Fibres

In this examination the Mechanical Properties of Coconut Leaf Stalk Fibre Peduncle is found for the various lengths (3mm, 6mm, 9mm) are taken and treating with two different process. One set of fibre is washed with the distilled water and another set of fibre is treated with sodium hydroxide (NaOH) solution to increase the strength of the fibre. Here the NaOH mixer is about 5% are considered. After treatment the fibre are dried for 2 days and cut to the required sample size. All sample composite materials were made using the standard die (hand layup method) and samples were cut using high-pressure water jet cutter as per ASTM standard. The test was taken with ASTM D638, ASTM D790 and ASTM D256 standard Universal testing machine (UTM). The result exemplify that the 6 mm alkali-treated CPLSF (6 NTCPLSF) composite exhibited the maximum tensile strength of 26.14MPa, the flexural strength of 79.81MPa and impact strength (Izod) 9.7 kJ/m2.

The mechanism and application of high-pressure water jet technology to prevent compound dynamic disaster

2021 ◽  
Vol 14 (13) ◽  
Author(s):  
Zeng-qiang Yang ◽  
Chang Liu ◽  
Feng-shuo Li ◽  
Lin-ming Dou ◽  
Gang-wei Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
Dynamic Disaster ◽  
High Pressure Water Jet
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