scholarly journals A New Integral Constitutive Equation and Determination of Material Constants for the Endochronic Theory of Cyclic Plasticity

1986 ◽  
Vol 52 (481) ◽  
pp. 2285-2293 ◽  
Author(s):  
Osamu WATANABE
Keyword(s):  
Constitutive Equation ◽  
Cyclic Plasticity ◽  
Endochronic Theory ◽  
Material Constants ◽  
Integral Constitutive Equation

A Simplified Transient Hardening Formulation for Modeling Stress–Strain Response Under Multiaxial Nonproportional Cyclic Loading

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Nicholas R. Gates ◽  
Ali Fatemi
Keyword(s):  
Cyclic Plasticity ◽  
Accurate Estimation ◽  
Strain Response ◽  
Multiaxial Loading ◽  
Loading Conditions ◽  
Stress Strain ◽  
Material Constants ◽  
Modeling Stress ◽  
Incremental Step

Accurate estimation of material stress–strain response is essential to many fatigue life analyses. In cases where variable amplitude loading conditions exist, the ability to account for transient material deformation behavior can be particularly important due to the potential for periodic overloads and/or changes in the degree of nonproportional stressing. However, cyclic plasticity models capable of accounting for these complex effects often require the determination of a large number of material constants. Therefore, an Armstrong–Frederick–Chaboche style plasticity model, which was simplified in a previous study, was extended in the current study to account for the effects of both general cyclic and nonproportional hardening using a minimal number of material constants. The model was then evaluated for its ability to predict stress–strain response under complex multiaxial loading conditions by using experimental data generated for 2024-T3 aluminum alloy, including a number of cyclic incremental step tests. The model was found to predict transient material response within a fairly high overall level of accuracy for each loading history investigated.

Establishment of an ANSYS-Based Constitutive Modeling for Age Forming of Aluminum Alloy

2012 ◽  
Vol 217-219 ◽  
pp. 1497-1500 ◽  
Author(s):  
Xiao Jun Zuo ◽  
Jun Chu Li ◽  
Da Hai Liu ◽  
Long Fei Zeng
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Equation ◽  
Material Model ◽  
Tensile Tests ◽  
Material Constants ◽  
Tensile Process ◽  
Simulation Based ◽  
Optimal Material ◽  
Two Stages ◽  
Good Agreement

Constructing accurate constitutive equation from the optimal material constants is the basis for finite element numerical simulation. To accurately describe the creep ageing behavior of 2A12 aluminum alloy, the present work is tentatively to construct an elastic-plastic constitutive model for simulation based on the ANSYS environment. A time hardening model including two stages of primary and steady-state is physically derived firstly, and then determined by electronic creep tensile tests. The material constants within the creep constitutive equations are obtained. Furthermore, to verify the feasibility of the material model, the ANSYS based numerical scheme is established to simulate the creep tensile process by using the proposed material model. Results show that the creep constitutive equation can better describe the deformation characteristics of materials, and the numerical simulations and experimental test points are in good agreement.

scholarly journals Determination of a Constitutive Equation by the Thin Wafer Method

1977 ◽  
Vol 43 (371) ◽  
pp. 2397-2403
Author(s):  
Noboru UEDA ◽  
Keizo KISHIDA ◽  
Kenji NAKAGAWA
Keyword(s):  
Constitutive Equation
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