A NEW MODEL FOR COUPLING OF TRIBOLOGICAL AND MECHANICAL MODELS OF THIN STRIP AND FOIL ROLLING

2019 ◽  
Vol 14 (3) ◽  
Author(s):  
Manoj Kumar ◽  
Jyoti Raman ◽  
Priya Priya
Keyword(s):  
Inverse Method ◽  
Solution Method ◽  
Thin Strip ◽  
Tension Stress ◽  
Neutral Zone ◽  
Entry And Exit ◽  
Explicit Equation ◽  
Mechanical Models ◽  
Roll Deformation ◽  
Friction Models

A new analysis for cold rolling of thin strip and foil is developed. This model follows the approach of Fleck et al [8], but relaxes their assumption of a central flat neutral zone. Instead of following their inverse method to obtain the pressure distribution in this neutral zone, an explicit equation for the contact pressure variation is obtained from the sticking condition in this region. This significantly simplifies the solution method, leading to a much more robust algorithm. Moreover, the method treats the cases either where the roll retains its circular arc or where there is very significant roll deformation in the same way, greatly simplifying the method of obtaining solutions. This will facilitate the incorporation of other effects such as the friction models currently being developed. Results are in line with the theory of Fleck et al [8]. The effect of entry and exit tensions on the nondimensional load and forward slip is investigated. It is found that the effect of equal entry and exit tensions is equivalent to reducing the yield stress of the strip by this tension stress.

Cold Rolling of Foil

1992 ◽  
Vol 206 (2) ◽  
pp. 119-131 ◽  
Author(s):  
N A Fleck ◽  
K L Johnson ◽  
M E Mear ◽  
L C Zhang
Keyword(s):  
Cold Rolling ◽  
Constant Coefficient ◽  
Coulomb Friction ◽  
Master Curve ◽  
Critical Value ◽  
Neutral Zone ◽  
Entry And Exit ◽  
Wide Range ◽  
Dimensional Parameters ◽  
Single Master Curve

A theory of cold rolling of thin gauge strip is presented which, within the idealizations of homogeneous deformation and a constant coefficient of Coulomb friction, rigorously models the elastic deformation of the rolls and the frictional traction at the interface. In contrast with classical theories (3) it is shown that, for gauges less than a critical value, plastic reduction takes place in two zones, at entry and exit, which are separated by a neutral zone in which the rolls are compressed fiat and there is no slip between the rolls and the strip. Roll load and torque are governed by five independent non-dimensional parameters which express the influence of gauge, reduction, friction and front and back tensions. Values of load and torque have been computed (for zero front and back tensions) for a wide range of thickness, reduction and friction and have been found to collapse approximately on to a single master curve.

Estimation of Coupled Thermo-Physical and Thermo-Mechanical Properties of Porous Thermolabile Ceramic Material Using Hot Distortion Plus® Test

2011 ◽  
Vol 312-315 ◽  
pp. 764-769 ◽  
Author(s):  
Zenon Ignaszak ◽  
Paweł Popielarski ◽  
Tomasz Strek
Keyword(s):  
Ceramic Material ◽  
Solution Method ◽  
Porous Ceramic ◽  
Quality Parameters ◽  
Physical Parameters ◽  
Heated Sample ◽  
Mould Material ◽  
Sand Mixture ◽  
Apparent Thermal Conductivity ◽  
Mechanical Models

In the paper the thermo-mechanical phenomena which occur in thermal shocked thermolabile porous ceramic material were described. Such materials are applied in foundry industry for mould making and they are characterized the low thermal stability losing its strength above 400°C. In [3] the usefulness of Hot Distortion Plus® to estimate the thermo-physical parameters (apparent thermal conductivity, heat capacity) was discussed. These parameters are necessary in data base of simulation codes which permit to simulate the phenomena in casting-mould system. The aim of these tests is to predict the mould material phenomena influence on castings quality. Parameters applied in these thermo-mechanical models (Young's modulus, Poisson's ratio, Yield stress) and their variations with temperature are not really known for thermal unstable mould material. There is no adapted method in literature and description of such total investigations of both parameters groups: thermo-physical and thermo-mechanical. The author's method called Hot Distortion Plus® consists in acquisition of temperature curves of heated sample of material and correlation with curves of their dilatation. Following the simulation using inverse solution method to reproduce the measured parameters with experiment was applied. The tests were carried out for the new quartz sand bonded by resin (approx. 1%). The specimens (dimensions 114 × 25 × 6mm) from binder-sand mixture were made using special core-box.

A general inverse method for modelling extensional sedimentary basins

2000 ◽  
Vol 12 (3-4) ◽  
pp. 219-226 ◽  
Author(s):  
P. Bellingham ◽  
N. White
Keyword(s):  
Inverse Method ◽  
Sedimentary Basins

Thin strip casting at Thyssen Stahl, using single or double roller

1990 ◽  
Vol 87 (4) ◽  
pp. 351-356
Author(s):  
D. Senk ◽  
Ch. Schneider ◽  
R. Kopp
Keyword(s):  
Strip Casting ◽  
Thin Strip

Elasto-plastic state of curve beam system subjected to complex loading

1996 ◽  
Vol 18 (4) ◽  
pp. 14-22
Author(s):  
Vu Khac Bay
Keyword(s):  
Cylindrical Shell ◽  
Solution Method ◽  
Complex Loading ◽  
Numerical Results ◽  
Elastic Solution ◽  
Plastic State ◽  
Curve Beam ◽  
Elastic State ◽  
Elastic Plastic ◽  
Beam System

Investigation of the elastic state of curve beam system had been considered in [3]. In this paper the elastic-plastic state of curve beam system in the form of cylindrical shell is analyzed by the elastic solution method. Numerical results of the problem and conclusion are given.

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