The Role of Constitutive Formulation in the Analysis of Hot Rolling

1987 ◽  
Vol 109 (4) ◽  
pp. 343-349 ◽  
Author(s):  
J. G. Lenard ◽  
F. Wang ◽  
G. Nadkarni
Keyword(s):  
Hot Rolling ◽  
Constitutive Modelling ◽  
Material Behavior ◽  
Steel Mill ◽  
Flow Strength ◽  
Strength Data ◽  
Flat Rolling ◽  
Constitutive Formulation

The effect of constitutive modelling of material behavior on the predictive abilities of two models of flat rolling is studied. Comparison of calculated roll forces and powers to those measured on a commerical steel mill indicates that the Orowan model is sufficiently accurate when supplied with carefully determined flow strength data. The manner of representation of that data is found to be significant. The results show that a multidimensional databank, which stores values of strength for specific strains, rates of strain and temperatures is very useful in modelling the process.

Biomechanics of Soft Tissues: The Role of the Mathematical Model on Material Behavior

2019 ◽  
pp. 301-311
Author(s):  
Carlos Bustamante-Orellana ◽  
Robinson Guachi ◽  
Lorena Guachi-Guachi ◽  
Simone Novelli ◽  
Francesca Campana ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Soft Tissues ◽  
Material Behavior ◽  
The Mathematical Model

Statistical Evaluation of Some Hot Rolling Theories

1982 ◽  
Vol 104 (1) ◽  
pp. 47-52 ◽  
Author(s):  
A. Murthy ◽  
J. G. Lenard
Keyword(s):  
Experimental Data ◽  
Hot Rolling ◽  
Laboratory Experiments ◽  
Statistical Evaluation ◽  
Low Carbon ◽  
Flow Strength ◽  
Hsla Steels ◽  
Accuracy And Precision ◽  
Hot Strip ◽  
Hot Strip Mills

The accuracy and precision of four mathematial models of varying complexity are evaluated by comparing their predictions to experimental data generated in carefully controlled laboratory experiments and to production logs obtained from the finishing trains of several Canadian, American, and European hot strip mills. The materials rolled are low carbon and HSLA steels; the models used are Orowan’s formulation with Shida’s flow strength and Ford and Alexander’s formulation with Shida’s flow strength; then both these formulations are combined with Ekelund’s flow strength equation. It is concluded that Orowan’s formulation with Shida’s flow strength relation is the most consistently accurate technique of analysis. Further, the behavior of HSLA steels is not well described by either Shida’s or Ekelund’s equations.

scholarly journals Environmental justice and the politics of pollution: The case of the Formosa Ha Tinh Steel pollution incident in Vietnam

2020 ◽  
pp. 251484862097316
Author(s):  
Mei-Fang Fan ◽  
Chih-Ming Chiu ◽  
Leslie Mabon
Keyword(s):  
Environmental Justice ◽  
Transnational Networks ◽  
Democratic Participation ◽  
Steel Mill ◽  
Untreated Wastewater ◽  
Problem Framing ◽  
Access To Knowledge ◽  
Local Narratives ◽  
New Infrastructure

Research on environmental justice in authoritarian regimes, and in particular on how transnational networks support problem framing and claims-making in the absence of state-led democratic participation instances, is limited. This article uses the case of untreated wastewater from a steel mill owned by Taiwanese conglomerate Formosa Plastics Group, which caused mass fish deaths along coastal provinces in Vietnam in 2016, to explore how civic groups and local communities problematize official accounts of events and engage with transnational networks to make claims to environmental injustice. The paper highlights local narratives about the adverse impacts of the disaster on residents’ livelihoods and wellbeing, controversies over the causes of and responsibility for the disaster, and the role of transnational alliances with Taiwan in sustaining and magnifying claims to injustice. We argue that viewing issues such as the Formosa steel incident through a transnational environmental justice lens illuminates the effect of global and national processes of economic reform in shaping uneven environmental and social impacts from new infrastructure developments. We also argue that thinking in terms of transnational networks can make sense of the spaces which can emerge for claims-making in authoritarian contexts, where democratic participation instances and access to knowledge may be restricted.

A Continued Evaluation of the Role of Material Hardening Behavior for the NeT TG1 and TG4 Specimens

2014 ◽  
Author(s):  
David J. Dewees ◽  
Phillip E. Prueter ◽  
Seetha Ramudu Kummari
Keyword(s):  
Structural Integrity ◽  
Plastic Material ◽  
Critical Factor ◽  
Material Model ◽  
Standard Test ◽  
Material Behavior ◽  
Weld Residual Stress ◽  
Hardening Models ◽  
Elastic Plastic Material

Modeling of cyclic elastic-plastic material behavior (hardening) has been widely identified as a critical factor in the finite element (FE) simulation of weld residual stresses. The European Network on Neutron Techniques Standardization for Structural Integrity (NeT) Project has provided in recent years both standard test cases for simulation and measurement, as well as comprehensive material characterization. This has allowed the role of hardening in simulation predictions to be isolated and critically evaluated as never before possible. The material testing information is reviewed, and isotropic, nonlinear kinematic and combined hardening models are formulated and tested. Particular emphasis is placed on material model selection for general fitness-for-service assessments, as it relates to the guidance for weld residual stress (WRS) in flaw assessments of in-service equipment in Annex E of the FFS standard, API 579-1/ASME FFS-1.

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.

A role of δ-ferrite in edge-crack formation during hot-rolling of austenitic stainless steels

1997 ◽  
Vol 37 (8) ◽  
pp. 1231-1235 ◽  
Author(s):  
F. Czerwinski ◽  
A. Brodtka ◽  
J.Y. Cho ◽  
A. Zielinska-Lipiec ◽  
J.H. Sunwoo ◽  
...  
Keyword(s):  
Stainless Steels ◽  
Hot Rolling ◽  
Edge Crack ◽  
Crack Formation ◽  
Austenitic Stainless Steels ◽  
Δ Ferrite

The role of oxide-scale microtexture on tribological behaviour in the nanoparticle lubrication of hot rolling

2016 ◽  
Vol 93 ◽  
pp. 190-201 ◽  
Author(s):  
Xianglong Yu ◽  
Zhengyi Jiang ◽  
Jingwei Zhao ◽  
Dongbin Wei ◽  
Ji Zhou ◽  
...  
Keyword(s):  
Oxide Scale ◽  
Hot Rolling ◽  
Tribological Behaviour
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