Effect of Rock Stress Evolution on Failure Under Transverse Plain Water Jet

2020 ◽  
Vol 38 (4) ◽  
pp. 3941-3954
Author(s):  
Mengmeng Hu ◽  
Biao Li ◽  
Bo Zhang ◽  
Chao Zhang ◽  
Lichao Nie ◽  
...  
Keyword(s):  
Water Jet ◽  
Plain Water ◽  
Stress Evolution ◽  
Rock Stress

Research on Hole Making Mechanism of High Pressure Hydraulic Perforation

2014 ◽  
Vol 590 ◽  
pp. 96-100 ◽  
Author(s):  
Hai Cheng Li ◽  
Xu Jing Zhang ◽  
Fu Min Liang
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Stress Distribution ◽  
Tensile Stress ◽  
Water Jet ◽  
Rock Fragmentation ◽  
Rock Stress ◽  
Element Simulation ◽  
Pressure Water ◽  
High Pressure Water Jet

In this paper, we integrated use hydraulics, seepage flow mechanics, rock mechanics, and finite element simulation analysis and other methods to study the rock fragmentation mechanism of high pressure water jet. We make tensile stress - crack expansion comprehensive rock fragmentation model for the screw drilling of high pressure water jet. We make finite element simulation according to the mechanism of integrated model of high pressure water jet process, to analysis the internal rock stress distribution and external rock stress distribution of the fluid, and come to the reasonable number of high-pressure water jet nozzle hole. It is verified by the high pressure water jet breaking rock inside experiments of tensile stress - comprehensive rock fragmentation fracture expansion model, summarizes the law of high pressure water jet breaking rock, and we get to know reasonable drilling mode of the high pressure water jet is screw drilling with pitch of 120mm. At present there are two main types of the micro mechanism of the high pressure water jet. One is stress and tensile damage, because of the action produced by stress wave of the high pressure water jet impacting on rock, which mainly makes the tensile failure of rock; another one is crack expansion damage, under the effect of quasi static pressure radiation of water jet, the coupling effect between water shooting jet and rock pore skeleton, which make the rock pore, throat, and micro cracks expanding gradually, eventually the macro damage.

518 Evaluation of removal properties of plain water jet for thermally sprayed materials

2009 ◽  
Vol 2009.47 (0) ◽  
pp. 171-172
Author(s):  
Chiharu Fukushima ◽  
Norikazu Ito ◽  
Yoshiko Shinhara ◽  
Mitsuo Kido
Keyword(s):  
Water Jet ◽  
Plain Water ◽  
Thermally Sprayed

Study of the bottom-hole rock stress field under water jet impact

2016 ◽  
Vol 38 (2) ◽  
pp. 164-173 ◽  
Author(s):  
G. Li ◽  
D. Chang ◽  
Z. Shen ◽  
Z. Huang ◽  
S. Tian ◽  
...  
Keyword(s):  
Stress Field ◽  
Water Jet ◽  
Rock Stress ◽  
Bottom Hole ◽  
Jet Impact

Titanium Alloy Milling Using Abrasive Water Jet for Repair Application: Modifications in Surface Quality and Material Integrity Following Plain Water Jet Cleaning

2021 ◽  
Vol 1016 ◽  
pp. 1374-1380
Author(s):  
Xavier Sourd ◽  
Mehdi Salem ◽  
Redouane Zitoune ◽  
Akshay Hejjaji ◽  
Damien Lamouche
Keyword(s):  
Titanium Alloy ◽  
Surface Quality ◽  
Surface Hardness ◽  
Water Jet ◽  
Depth Of Cut ◽  
Plain Water ◽  
Abrasive Water Jet ◽  
Abrasive Particles ◽  
Versatile Technique ◽  
Titanium Alloy Ti6al4v

Abrasive Water Jet (AWJ) machining has proven to be an effective and versatile technique for milling various kinds of materials, even with low machinability such as aerospace grade titanium alloy Ti6Al4V. Many studies have been performed in order to master this technology and produce geometrically accurate shapes. However, in the context of bonding repairs which require surfaces free from foreign bodies, AWJ machining presents a significant drawback in form of abrasive grit embedment. The goal of this present work is then to investigate the effect of a post-AWJ machining cleaning operation using Plain Water Jet process (PWJ – i.e. without abrasive particles) on the surface quality and material properties. For this, several characterization techniques were employed. It was concluded that the contamination has been reduced by 65% without noticeable changes in depth of cut and crater volume. The AWJ milling operation produced surface and subsurface hardening as well as biaxial compressive residual stress, mostly piloted by the jet pressure. PWJ cleaning reduced the depth of hardening without clear modification in surface hardness.

scholarly journals Removal of Thermally Sprayed Coatings Using a Plain Water Jet

2013 ◽  
Vol 8 (1) ◽  
pp. 43-53
Author(s):  
Chiharu FUKUSHIMA ◽  
Norikazu ITO ◽  
Yoshiko SHINHARA ◽  
Mitsuo KIDO
Keyword(s):  
Water Jet ◽  
Plain Water ◽  
Thermally Sprayed Coatings ◽  
Thermally Sprayed ◽  
Sprayed Coatings

The nature and determination of stress in the accessible lithosphere

1991 ◽  
Vol 337 (1645) ◽  
pp. 5-24 ◽  
Keyword(s):  
Dynamical System ◽  
Stress State ◽  
Stress Evolution ◽  
Rock Stress ◽  
Dissipative Dynamical System ◽  
Rock Cores ◽  
Adequate Understanding

Results of stress determination show that stress state is characteristically heterogeneous and apparently unpredictable. Characterization of in situ stress state requires the determination of stress at individual locations and then spatial if not also temporal extrapolation. A variety of different measurements are used as a basis to determine stress state. Thus an adequate understanding of both the nature and origin of rock stress is essential. Representation of the lithosphere as a non-equilibrium, dissipative, dynamical system is shown to be consistent with observations of stress state and fluctuation of crustal displacement. The evolution of rock cores subject to a variety of perturbations in the laboratory can similarly be shown to be consistent with the evolution of a dissipative, dynamical system, driven in part by stored strain energy. These observations are inconsistent with the assumption that rock stress can be adequately represented by superposed traction and internally balanced stresses arising from quasi-static processes. The potential value of analyses of the dynamics of rock stress evolution is emphasized as a means to simplify the apparent complexity arising from present perceptions.

1417 Removal of thermally sprayed materials using plain water jet : Classifications for removed surface state

2010 ◽  
Vol 2010.48 (0) ◽  
pp. 457-458
Author(s):  
Chiharu Fukushima ◽  
Norikazu Ito ◽  
Yoshiko Shinhara ◽  
Mitsuo Kido
Keyword(s):  
Surface State ◽  
Water Jet ◽  
Plain Water ◽  
Thermally Sprayed
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