Influence of hydrostatic pressure on water absorption of polyoxymethylene: experiment and molecular dynamics simulation

2016 ◽  
Vol 28 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Song Chen ◽  
Haiping Xu ◽  
Haitao Duan ◽  
Meng Hua ◽  
Lei Wei ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrostatic Pressure ◽  
Water Absorption ◽  
Dynamics Simulation

Molecular Dynamics Simulation of a Cutting Method by Making Use of Localized Hydrostatic Pressure

2016 ◽  
Vol 1136 ◽  
pp. 156-161 ◽  
Author(s):  
Jun Shimizu ◽  
Keito Uezaki ◽  
Li Bo Zhou ◽  
Takeyuki Yamamoto ◽  
Teppei Onuki ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrostatic Pressure ◽  
Cutting Tool ◽  
Dynamics Simulation ◽  
Burr Formation ◽  
Rectangular Hole ◽  
Machined Surface ◽  
Cutting Zone ◽  
Machined Surface Integrity

This study aims to develop a cutting method, which enables to generate a localized hydrostatic pressure field in the vicinity of cutting zone in order to improve the machined surface integrity without causing unnecessary plastic deformation. In the previous work, a molecular dynamics simulation was performed using a newly developed cutting tool equipped with a planer jig with a rectangular hole for the cutting chip elimination, and it was confirmed that the developed cutting tool has advantages in giving a relatively high-hydrostatic stress field in the vicinity of the cutting zone and in suppressing the burr formation. In this report, further molecular dynamics simulation was performed in order to clarify the influence of jig shape on the cutting phenomena and machined surface integrity. As a result, it is found that a cutting tool of which front and side except for the rectangular hole are covered by the planer jig is the most advantageous for supplying high hydrostatic pressure and suppressing burr formation.

Molecular Dynamics Simulation of Metal Cutting with Local Hydrostatic Pressure Field Formation

2012 ◽  
Vol 523-524 ◽  
pp. 167-172 ◽  
Author(s):  
Keito Uezaki ◽  
Jun Shimizu ◽  
Li Bo Zhou ◽  
Teppei Onuki ◽  
Hirotaka Ojima
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrostatic Pressure ◽  
Plastic Flow ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Pressure Field ◽  
Dynamics Simulation ◽  
Burr Formation ◽  
Cutting Point

Improving machined surface integrity is one of the important issues in the precision machining. This study aims to develop a cutting tool, which enables to generate a local hydrostatic pressure field in the vicinity of the cutting point to suppress the extra plastic flow in the workpiece, because it is known that materials including metals never cause plastic flow and fracture no matter how much greater hydrostatic pressure field is given. In this paper, a simple cutting tool with planer jig is proposed and a molecular dynamics simulation of cutting is performed as the first step. As a result, it is confirmed that the reduction of the plastic deformation, mainly in the burr formation become remarkable with the proposed model due to the suppression of extra side plastic flow, and relatively high-hydrostatic stress field is formed in the vicinity of cutting point. However, it is also observed that relatively many dislocations are generated beneath the cutting groove.

Molecular Dynamics Simulation of Cutting Process Assisted by Localized Compressive Hydrostatic Pressure

2019 ◽  
Vol 2019.27 (0) ◽  
pp. 714
Author(s):  
Haruna SAKURAI ◽  
Naohiko YANO ◽  
Jun SHIMIZU ◽  
Libo ZHOU ◽  
Teppei ONUKI ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Hydrostatic Pressure ◽  
Cutting Process ◽  
Dynamics Simulation
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