Fast Numerical Simulation of Symmetric Flat Rolling Processes for Inhomogeneous Materials Using a Layer Model − Part I: Basic Theory

2016 ◽  
Vol 87 (8) ◽  
pp. 1065-1081 ◽  
Author(s):  
Matthias Schmidtchen ◽  
Rudolf Kawalla
Keyword(s):  
Numerical Simulation ◽  
Basic Theory ◽  
Layer Model ◽  
Inhomogeneous Materials ◽  
Flat Rolling

Numerical simulation of electrical conductivity in microscopically inhomogeneous materials

1975 ◽  
Vol 11 (8) ◽  
pp. 2885-2892 ◽  
Author(s):  
Itzhak Webman ◽  
Joshua Jortner ◽  
Morrel H. Cohen
Keyword(s):  
Numerical Simulation ◽  
Electrical Conductivity ◽  
Inhomogeneous Materials

scholarly journals Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Processes ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 327
Author(s):  
Joong-Ki Hwang
Keyword(s):  
Numerical Simulation ◽  
Thermal Behavior ◽  
Effective Stress ◽  
Hot Rolling ◽  
Rolling Process ◽  
Measured Temperature ◽  
Temperature Deviation ◽  
Shape Rolling ◽  
Hot Rolling Process ◽  
Flat Rolling

The thermal behavior of a rod during the hot shape rolling process was investigated using the off-line hot rolling simulator and numerical simulation. Additionally, it was compared with a plate during the flat rolling process to understand the thermal behavior of the rod during the hot rolling process in more detail. The temperature of the rod and plate during the hot rolling process was measured at several points with thermocouples using the rolling simulator, and then the measured temperature of each region of a workpiece was analyzed with numerical simulation. During hot rolling process, the temperature distribution of the rod was very different from the plate. The temperature deviation of the rod with area was much higher than that of the plate. The variation in effective stress of the rod along the circumferential direction can induce the temperature difference with area of the rod, whereas the plate had a relatively lower temperature deviation with area due to the uniform effective stress on the surface area. The heat generation by plastic deformation during the forming process also increased the temperature deviation of the rod with area, whereas strain distribution of the plate during flat rolling contributed to the uniformity of temperature of the plate with area. The higher temperature deviation of the rod along the circumferential and radial directions during the shape rolling process can increase the possibility of occurrence in surface defects compared to the plate during flat rolling.

Development and Application of Slow Crack Propagation of Polyethylene Based on Crack Layer Theory

2007 ◽  
Vol 345-346 ◽  
pp. 489-492 ◽  
Author(s):  
Byoung Ho Choi ◽  
Alexander Chudnovsky
Keyword(s):  
Numerical Simulation ◽  
Crack Propagation ◽  
Crack Growth ◽  
Driving Forces ◽  
Slow Crack Growth ◽  
Layer Model ◽  
Elapsed Time ◽  
Simulation Based ◽  
Crack Layer

For explaining the SCG behavior of polyethylene, the crack layer theory is applied based on the description of two driving forces: crack and PZ. The relations between the speed of SCG, crack length and elapsed time are the most important characteristics of polyethylene resistance to crack propagation, or long-term brittle fracture. The crack layer model of slow crack growth in polyethylene is designed in such a way that it qualitatively reproduces the main features of the process indicated above and makes it possible to quantitatively match any pattern of step-wise crack growth. In this paper, the behavior of SCG of polyethylene is developed for numerical simulation based on the crack layer theory. Some parametric study and applications are addressed based on the developed simulation program.

scholarly journals Numerical simulation of a compressible two-layer model: A first attempt with an implicit–explicit splitting scheme

2019 ◽  
Vol 346 ◽  
pp. 357-377 ◽  
Author(s):  
Charles Demay ◽  
Christian Bourdarias ◽  
Benoît de Laage de Meux ◽  
Stéphane Gerbi ◽  
Jean-Marc Hérard
Keyword(s):  
Numerical Simulation ◽  
Splitting Scheme ◽  
Layer Model ◽  
Two Layer Model
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