A Mechanical Model for TRIP Sheet Steel Forming

2011 ◽  
Vol 221 ◽  
pp. 21-26
Author(s):  
Ti Kun Shan ◽  
Li Liu
Keyword(s):  
Constitutive Equation ◽  
Strain Hardening ◽  
Uniaxial Tension ◽  
Work Hardening ◽  
Trip Steel ◽  
Mechanical Model ◽  
Sheet Steel ◽  
Stress Triaxiality ◽  
Transformation Rate ◽  
Stress Strain Relation

An enhanced elastic-plastic constitutive equation taking into account strain induced transformation and its effect on work hardening of TRIP steel during deformation are investigated. The transformation rate relies on the stress triaxiality. The strain hardening of the TRIP steel takes on parabola shape because of the austenite changed to the martensite during straining. The physical model is verified by comparing with the stress-strain relation of the uniaxial tension experiment. The results showed that the steel keeps a high hardening potential which retards the onset of necking and a good formability thanks to the martensitic strain-induced transformation and the subsequent austenite hardening.

The effect of strain rate on the plastic flow characteristics of steel and aluminium sheet

1966 ◽  
Vol 1 (5) ◽  
pp. 439-446 ◽  
Author(s):  
A N Bramley ◽  
P B Mellor
Keyword(s):  
Strain Rate ◽  
Uniaxial Tension ◽  
Plastic Flow ◽  
Work Hardening ◽  
Sheet Steel ◽  
Flow Characteristics ◽  
Strain Rates ◽  
Plastic Strains ◽  
Aluminium Sheet

Work-hardening characteristics for sheet steel and aluminium have been obtained experimentally over a range of strain rates from 10−4 to 102/s. Use of the diaphragm test enables work-hardening characteristics to be obtained to much higher plastic strains than is possible in uniaxial tension. Results for killed steel show that the slope of the work-hardening characteristics decreases with increase in strain rate. Tentative extrapolation of the results suggests that if similar tests could be carried out at a strain rate of 104 then the work hardening characteristic would be that of an ideally plastic solid. In the case of aluminium the above phenomenon is not so marked and it is not possible to make even a tentative extrapolation to higher strain rates.

Springback Prediction of the TRIP Sheet Steel Stamping

2011 ◽  
Vol 221 ◽  
pp. 152-158 ◽  
Author(s):  
Ti Kun Shan ◽  
Li Liu
Keyword(s):  
Martensitic Transformation ◽  
Constitutive Equation ◽  
Trip Steel ◽  
Steel Sheet ◽  
Sheet Steel ◽  
Material Model ◽  
Fe Model ◽  
Trip Steels ◽  
Trip Steel Sheet ◽  
Springback Prediction

An enhanced elastic-plastic constitutive equation taking into account strain induced transformation is developed. The variation of the Young’s modulus with the martensitic transformation during stamping process is also introduced to improve the accuracy of springback simulation for TRIP steel. The accuracy of the proposed method is verified by comparing with the conventional FE model and experimental results. The enhanced material model is testified to be efficient in accurate prediction on springback for TRIP steels, which will put forward the application of TRIP steel sheet in auto body manufacturing.

Effect of texture and microstructure on strain hardening anisotropy for aluminum deformed in uniaxial tension and simple shear

2003 ◽  
Vol 19 (1) ◽  
pp. 1-22 ◽  
Author(s):  
A.B. Lopes ◽  
F. Barlat ◽  
J.J. Gracio ◽  
J.F. Ferreira Duarte ◽  
E.F. Rauch
Keyword(s):  
Strain Hardening ◽  
Uniaxial Tension ◽  
Simple Shear

Anomaly of the Work Hardening of Zn-Cu Single Crystals Oriented for Slip in Secondary Systems

2011 ◽  
Vol 56 (4) ◽  
pp. 1021-1027
Author(s):  
K. Pieła
Keyword(s):  
Strain Hardening ◽  
Single Crystals ◽  
Yield Stress ◽  
Work Hardening ◽  
Temperature Anomaly ◽  
Strain Hardening Exponent ◽  
Plastic Behavior ◽  
Thermal Dependence ◽  
Copper Addition ◽  
Secondary Systems

Anomaly of the Work Hardening of Zn-Cu Single Crystals Oriented for Slip in Secondary SystemsThe copper alloyed (up to 1.5%) zinc single crystals oriented for slip in non-basal systems (orientation close to < 1120 >) were subjected to compression test within a range of temperatures of 77-293K. It has been stated, that Zn-Cu crystals exhibit characteristic anomalies of the thermal dependence of yield stress and of the strain hardening exponent. Both of them are related to the change in type and sequence of active non-basal slip systems: pyramidal of the 1storder {1011} < 1123 > (Py-1) and pyramidal of the 2ndorder {1122} < 1123 > (Py-2). The temperature anomaly of the yield stress results from the change of the slip from Py-2 systems to simultaneous slip in the Py-2 and Py-1 (Py-2 + Py-1) systems, occurring in the preyielding stage. On the other hand, sequential activation of pyramidal systems taking place in advanced plastic stage (i.e. the first Py-2 and next Py-2 + Py-1 systems) is responsible for temperature anomaly of strain hardening exponent. Increase in copper addition favors the activity of Py-2 systems at the expense of Py-1 slip, what leads to a drastic differences in plastic behavior of zinc single crystals.

Strain-hardening of steel by dynamic uniaxial tension

1988 ◽  
Vol 28 (6) ◽  
pp. 923-929
Author(s):  
A. G. Ivanov ◽  
A. I. Korshunov ◽  
A. M. Podurets ◽  
V. A. Ryzhanskii ◽  
N. A. Yukina
Keyword(s):  
Strain Hardening ◽  
Uniaxial Tension

Some Properties of a Mechanical Model of Plasticity

1948 ◽  
Vol 15 (3) ◽  
pp. 222-225
Author(s):  
H. F. Bohnenblust ◽  
Pol Duwez
Keyword(s):  
Plastic Deformation ◽  
Potential Energy ◽  
Work Hardening ◽  
Mechanical Model ◽  
Strain Curve ◽  
Hysteresis Curve ◽  
Plastic Range ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Mechanical Models

Abstract Various mechanical models explaining the plastic deformation of metals have been proposed. One of the present authors has shown that in some cases an analytical expression for the stress-strain curve and the hysteresis curve of a metal in the plastic range can be deduced from such a model. The present investigation is a further analysis of the model leading to the computation of the change in potential energy of the metal due to work-hardening.

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