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failure model will be developed on the basis of a failure func tion. This model will predict the changes in constitutive prop erties and resistance values in aggressive environments. Since previous work has shown that temperature can affect the strength properties (3) temperature was selected as the primary testing variable for

Get Price### Constitutive modeling for high-temperature flow behavior

Jan 10 2017 · The high-temperature flow behavior modeling may be addressed through proper constitutive equations which correlate the flow stress strain strain rate and temperature. In this context the constitutive equations are generally classified into three categories i.e. phenomenological physical and artificial neural network (ANN) .

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Jan 17 2018 · Uniaxial hot tensile tests were conducted on a Gleeble-3500 thermal simulation machine to characterize the flow behavior of AA7075. Fig. 1a shows the dimensions of the specimen for thermal simulation and Fig. 1b shows the process route. The tensile direction was parallel to rolling direction and the specimens were deformed at different temperatures of 300 °C − 450 °C and different strain

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A constitutive equation based on the hyperbolic sinusoidal Arrhenius-type model has been developed to describe the hot deformation behavior of a β-γ Ti-Al alloy containing 8 at. of Nb. Experimental true stress-true strain data were acquired from isothermal hot compression tests conducted across a wide range of temperatures (1273 K 1473 K

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Constitutive Modeling of High-Temperature Flow Behavior of an Nb Micro-alloyed Hot Stamping Steel . By Shiqi Zhang Ding Feng Yunhua Huang Shizhong Wei Hardy Mohrbacher and Yue Zhang. Cite . BibTex Full citation Publisher Springer Nature. Year 2016. DOI identifier 10.1007/s. OAI identifier

Get Price### Constitutive Modeling of High-Temperature Flow Behavior of

Constitutive Modeling of High-Temperature Flow Behavior of an Nb Micro-alloyed Hot Stamping Steel . By Shiqi Zhang Ding Feng Yunhua Huang Shizhong Wei Hardy Mohrbacher and Yue Zhang. Cite . BibTex Full citation Publisher Springer Nature. Year 2016. DOI identifier 10.1007/s. OAI identifier

Get Price### A CONSTITUTIVE MODEL AND DATA FOR METALS

This paper presents a constitutive model and data for materials subjected td large strains high strain rates and high temperatures. The basic form of the model is well suited for computations because it uses variables which are readily available in most of the applicable computer codes. The materials considered are OFHC copper Cartridge brass Nickel 200 Armco iron Carpenter electrical

Get Price### FLOW STRESS BEHAVIOR O F 30CrMoA STEEL UNDER HIGH

X. D. SHU et al. FLOW STRESS BEHAVIOR O F 30CrMoA STEEL UNDER HIGH TEMPERATURE COMPRESSION METALURGIJA 59 (2020) 3 The stress function in the form of power function is mainly suitable for low stress conditions the stress function in the form of exponential function is mainly suitable for high stress conditions and the stress func-

Get Price### Constitutive modeling for high-temperature flow behavior

Flow behavior of the alloy was predicted through developing two phenomenological constitutive models considering the coupled effects of deformation temperature strain rate and strain. Furthermore a comparative study was performed on the capability of the aforementioned models to predict the high-temperature flow behavior of the Ti-6242S alloy.

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Abstract To predicate the high temperature flow behavior of Al/Mg based nanocomposite constitutive models such as general flow Arrhenius hyperbolic Johnson−Cook(JC) and modified Zerilli−Armstrong (ZA) models and artificial neural network(ANN) models were developed using stress−strain data collected from hot compression tests carried at different strain rates (0.01−1.0 s−1) and temperatures

Get Price### Approving Restoration Mechanism in 7075 Aluminum Alloy

Dec 29 2015 · Approving Restoration Mechanism in 7075 Aluminum Alloy through Constitutive Flow Behavior Modeling Mohammad Moghaddam The Complex Laboratory of Hot Deformation and Thermomechanical Processing of High Performance Engineering Materials School of Metallurgy and Materials Engineering College of Engineering University of Tehran P.O. Box 515

Get Price### A Modified Johnson–Cook Constitutive Model and Its

The influences of temperature on strain and strain rate hardening effects are revealed based on the flow stress behavior and microstructural alteration of tested specimens. Second a modified Johnson–Cook (JCM) constitutive model is proposed considering the influence of temperature

Get Price### Dynamic mechanical response and a constitutive model of Fe

Apr 23 2016 · The effects of strain rate and temperature on the dynamic behavior of Fe-based high temperature alloy was studied. The strain rates were 0.001–12 000 s−1 at temperatures ranging from room temperature to 800 °C. A phenomenological constitutive model (Power-Law constitutive model) was proposed considering adiabatic temperature rise and accurate material thermal physical properties.

Get Price### A constitutive model to describe high temperature flow

Apr 29 2019 · By modeling the high temperature flow behavior of materials in terms of constitutive equations the anticipated load and power requirements in various forming operations can be determined. Modeling also helps to analyze the material flow behavior.

Get Price### Constitutive Modeling Research PapersAcademia.edu

Constitutive modeling containing the relationship between stress strain strain rate and temperature is the essential input for understanding the thermo mechanical deformation processing results. In this research article the dynamics of deformation was studied on the basis of a phenomenological mathematical model.

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Mar 09 2016 · The high-temperature flow behavior of an aerospace structural material Al-0.62 Mg-0.73Si aluminum alloy was researched in this work. The isothermal compression tests were carried out in the temperature range of K and strain rate range of 0.001-1 s−1. Based on the obtained true stress-true strain curves the constitutive relationship of the alloy was revealed by establishing the

Get Price### A Comparative Study on Constitutive Modeling for Flow

A Comparative Study on Constitutive Modeling for Flow Behavior of Ultra-Supercritical Steel at High Temperature. یک مطالعه تطبیقی در مورد مدلسازی Constitutive برای رفتار جریان در دمای بالا ترجمه شده با .

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Development of new material models for describing the "high temperature" constitutive behavior of real materlals represents an Important area of research in engineering disciplines. Derivation of mathematical expressions (constitutive equations) which describe thls high temperature material behavior

Get Price### Constitutive Modeling for Flow Stress Behavior of Nimonic

Mar 01 2016 · Read "Constitutive Modeling for Flow Stress Behavior of Nimonic 80A Superalloy During Hot Deformation Process High Temperature Materials and Processes" on DeepDyve the largest online rental service for scholarly research with thousands of

Get Price### High temperature flow stress behavior of as-extruded 7075

The flow stress behavior of the as-extruded 7075 aluminum alloy was studied through single-pass compression experiment by using Gleeble 1500D simulator within a temperature range of ℃ and a strain rate range of 0.01-10 s-1.The results indicate that the flow stress curves show the characteristics of dynamic recovery when the temperature is no higher than 350 ℃.Above 350 ℃ the

Get Price### The Constitutive Model for High Temperature Flow Behavior

The hot deformation behavior of SiC/6168Al composite was studied by means of hot compression tests in the temperature range of °C and strain rate range of 0.01-10 s-1. The constitutive model was developed to predict the stress-strain curves of this composite during hot deformation. This model was established by considering the effect of the strain on material constants calculated by

Get Price### The Constitutive Model for High Temperature Flow Behavior

The hot deformation behavior of SiC/6168Al composite was studied by means of hot compression tests in the temperature range of °C and strain rate range of 0.01-10 s-1. The constitutive model was developed to predict the stress-strain curves of this composite during hot deformation. This model was established by considering the effect of the strain on material constants calculated by

Get Price### Application of constitutive and neural network models for

Abstract To predicate the high temperature flow behavior of Al/Mg based nanocomposite constitutive models such as general flow Arrhenius hyperbolic Johnson−Cook(JC) and modified Zerilli−Armstrong (ZA) models and artificial neural network(ANN) models were developed using stress−strain data collected from hot compression tests carried at different strain rates (0.01−1.0 s−1) and temperatures

Get Price### Constitutive modeling of flow behavior and microstructure

Jan 17 2018 · Uniaxial hot tensile tests were conducted on a Gleeble-3500 thermal simulation machine to characterize the flow behavior of AA7075. Fig. 1a shows the dimensions of the specimen for thermal simulation and Fig. 1b shows the process route. The tensile direction was parallel to rolling direction and the specimens were deformed at different temperatures of 300 °C − 450 °C and different strain

Get Price### High-Temperature Deformation Constitutive Law for

Nov 19 2015 · Recently the authors proposed a new temperature- and time-dependent strain-hardening constitutive model the dynamic strain-hardening constitutive model. The application of such a model has resulted in improved weld residual stress prediction compared to the residual stress measurement results from the contour and deep-hole drilling methods.

Get Price### Constitutive Modeling Research PapersAcademia.edu

Constitutive modeling containing the relationship between stress strain strain rate and temperature is the essential input for understanding the thermo mechanical deformation processing results. In this research article the dynamics of deformation was studied on the basis of a phenomenological mathematical model.

Get Price### Constitutive modeling of high temperature flow behavior in

Constitutive modeling of high temperature flow behavior in a Ti-45Al-8Nb-2Cr-2Mn-0.2Y alloy. April 2018 the constitutive model of 25 steel is built by the hyperbolic-sine equation over the

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Comparisons between the experimental and calculated flow stresses indicate that the developed constitutive model can accurately describe the high-temperature deformation behavior of the studied superalloy. Furthermore the developed constitutive model is also successfully used for analyzing time-variant hot working processes.

Get Price### A Modified Johnson–Cook Constitutive Model and Its

The influences of temperature on strain and strain rate hardening effects are revealed based on the flow stress behavior and microstructural alteration of tested specimens. Second a modified Johnson–Cook (JCM) constitutive model is proposed considering the influence of temperature

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