Constitutive modeling for high temperature compressive deformation of non-oriented electrical steel

2019 ◽  
Vol 61 (3) ◽  
pp. 204-208 ◽  
Author(s):  
Qiang Dong ◽  
Jianshui Zhang
Keyword(s):  
High Temperature ◽  
Constitutive Modeling ◽  
Electrical Steel ◽  
Compressive Deformation

Stress Relaxation of Sugi (Cryptomeria japonica D.Don) Wood in Radial Compression under High Temperature Steam

Holzforschung ◽  
1999 ◽  
Vol 53 (5) ◽  
pp. 541-546 ◽  
Author(s):  
W. Dwianto ◽  
T. Morooka ◽  
M. Norimoto ◽  
T. Kitajima
Keyword(s):  
High Temperature ◽  
Stress Relaxation ◽  
Cryptomeria Japonica ◽  
Chain Scission ◽  
Strain Recovery ◽  
Crystalline Lattice ◽  
Compressive Deformation ◽  
Radial Compression ◽  
Stress Strain ◽  
Permanent Fixation

Summary To clarify the mechanism of the permanent fixation of compressive deformation of wood by high temperature steaming, stress relaxation and stress-strain relationships in the radial compression for Sugi (Cryptomeria japonica D.Don) wood were measured under steam at temperatures up to 200°C. The stress relaxation curves above 100°C were quite different in shape from those below 100°C, showing a rapid decrease in stress with increasing temperature. In the stress-strain relationships measured above 140°C, the stress reduced as pre-steaming time increased when compared at the same strain. The recovery of compressive deformation (strain recovery) was decreased with steaming time and reached almost 0 in 10 min at 200°C. The relationship between the residual stress and the strain recovery at the end of relaxation measurements could be expressed by a single curve regardless of time and temperature. The permanent fixation of deformation by steaming below 200°C was considered to be due to chain scission of hemicelluloses accompanying a slight cleavage of lignin. In some cases, the increase in regularity of the crystalline lattice space of microfibrils or the formation of crosslinks between the cell wall polymers seemed to play an important role in the permanent fixation of compressive deformation.

Comparison of High-Temperature Compressive Deformation Characteristics of Differently Processed LY12 Aluminum Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 845-849
Author(s):  
Yao Wang ◽  
Qing Wei Jiang ◽  
Ying Wu ◽  
Xiao Wu Li
Keyword(s):  
High Temperature ◽  
Surface Deformation ◽  
Testing Temperature ◽  
Al Alloys ◽  
Compressive Deformation ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Al Alloy ◽  
Damage Characteristics ◽  
Angular Pressing

The individual or joint effects of annealing and equal channel angular pressing (ECAP) treatments on the high-temperature compressive deformation and damage behavior of cast LY12 Al alloys were studied. The compressive deformation behavior and surface deformation and damage characteristics of differently treated LY12 Al alloy samples were examined at temperatures ranging from 25°C to 400°C. It is found that the LY12 Al alloy exhibits different compressive mechanical behavior depending on different treatments, and the compressive deformation and damage characteristics of LY12 Al alloys with different microstructural states are closely related with the testing temperature. As compared to other samples (e.g. as-cast, annealed, as-cast+2ECAPed), the sample annealed at 450°C for 3h followed by ECAPed for 2 passages (i.e. annealed+2ECAPed) shows a better high-temperature deformation stability.

Constitutive Modeling of 17-12 Mo SPH Stainless Steel Behavior at High Temperature

1988 ◽  
Vol 110 (1) ◽  
pp. 51-58 ◽  
Author(s):  
P. Blanchard ◽  
P. Lemoine
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Constitutive Modeling ◽  
Constitutive Models ◽  
Austenitic Steels ◽  
Actual Behavior ◽  
Systematic Comparison ◽  
New Model

A systematic comparison of the detailed behaviors predicted by current constitutive models under various loadings and the actual behavior of austenitic steels under the same lodings was carried out. This comparison leads us to reject these models and to propose a new model whose predictions seem more realistic for these loadings: the unified multilayers model in which the material is represented by a composite of layers of various hardnesses. The details of the model are given in the paper.

Constitutive Modeling of the High-Temperature Flow Behavior of α-Ti Alloy Tube

2018 ◽  
Vol 27 (5) ◽  
pp. 2475-2483 ◽  
Author(s):  
Yanli Lin ◽  
Kun Zhang ◽  
Zhubin He ◽  
Xiaobo Fan ◽  
Yongda Yan ◽  
...  
Keyword(s):  
High Temperature ◽  
Constitutive Modeling ◽  
Flow Behavior ◽  
Ti Alloy ◽  
Alloy Tube
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