Analysis of effects of temperature variation on deep drawing process using different constitutive laws

Demirkol, Rasih Hakan
In this study, the influences of temperature variation in deep drawing process are investigated by changing the temperatures of the whole blank, a part of the blank, the punch and die. Different yield criteria and hardening rules are considered to form the constitutive relations. The numerical results are obtained by using a commercial finite element software. Whereas Von-Mises and Hill48 yield criteria are available in the finite element code, a subroutine is developed for embedding the Yld2003 yield criteria. Simulation results for isotropic, kinematic and combined hardening rules formulated with Von-Mises yield criterion are also acquired. Circular and square and complex shaped parts made of AA5754 and SS304 materials are used in the numerical analyses. The local heating simulations are conducted for a circular part through the heating of punch, die and, flange and inner regions of the blank for different combinations. For each case, the drawability of the part is obtained by using the Johnson-Cook failure criteria. Hot Forming and in-die Quenching (HFQ) analyses are carried out and the results are evaluated by using the mentioned constitutive equations for a complex shaped part made of AA5754. The complex shaped part also utilized in conducting local heating simulations. The results obtained for different constitutive equations by the finite element analyses are compared with each other and experimental results according to thickness strain distribution, punch force variation and rim shape of the deformed blank.


Analysis of wrinkling in deep drawing processes
Dal, Saniye Rabia; Darendeliler, Haluk; Department of Mechanical Engineering (2019)
Wrinkling, observed due to compressive instability, is one of the main failure modes in deep drawing processes. The prediction and prevention of wrinkles are critical for production of stamping parts which require good surface quality. In the current work, the occurrence of wrinkling in square and cylindrical cup deep drawing processes are investigated considering various constitutive models; formed by using CPB06ex2, Hill’48, BBC2008-8p, BBC2008-16p, and von Mises yield criterion with isotropic, kinematic ...
The effect of strain rate and temperature on deep drawing for different constitutive relations
Gökşen, Seçkin; Darendeliler, Haluk; Department of Mechanical Engineering (2019)
In this study, the effects of strain rate and temperature on deep drawing process are investigated by considering different yield criteria and hardening models. For this purpose, various punch velocity and temperature values are considered using 1 mmthick DKP6112 and AZ31 sheet materials. The results are compared according to thickness strain distribution and punch force obtained by a commercial finite element software. To express constitutive relations of corresponding materials for different strain rate a...
Modelling and simulation of friction in deep drawing
Başpınar, Murat; Akkök, Metin; Department of Mechanical Engineering (2011)
Different contact surface parameters and operating characteristics are observed during the deep drawing process. It is not possible to find a formulation that can be used for all lubrication regimes. Therefore, several friction models have been developed in order to overcome this problem. In this study, a math program is developed which combines Wilson’s and Khonsari’s friction models in a new model in order to increase accuracy and efficiency in friction calculations. By comparing the results of both frict...
The deactivation behavior of the TiO2 used as a photo-catalyst for benzene oxidation
Üner, Deniz (1999-01-01)
In this study, the deactivation behavior of TiO2 as a photocatalyst for benzene decomposition to carbon dioxide and water was investigated. The effect of space time on the benzene and carbon dioxide conversions were monitored. Benzene conversion and carbon dioxide production rates were not correlated, indicating accumulation of a carbon containing intermediate on the surface. This intermediate was blocking the active sites at a stiochiometry of 1 C:1 site. High space times favored the production of carbon d...
Determining surface residual stress in steel sheets after deep drawing and bulging processes
Adıgüzel, Sinem; Gür, Cemil Hakan; Karadoğan, Celalettin; Department of Metallurgical and Materials Engineering (2011)
The aim of this thesis is to investigate the effects of bulging and deep drawing processes on St4 cold rolled steel by simulation and experimental characterization. In the simulations, commercial software programs MSC Marc and Simufact.forming were used. The experimental studies cover metallographic investigations, hardness measurements, and residual stress measurements. Residual stress measurements were carried out by different non- destructive characterization methods; X-ray diffraction and Magnetic Barkh...
Citation Formats
R. H. Demirkol, “Analysis of effects of temperature variation on deep drawing process using different constitutive laws,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Mechanical Engineering., Middle East Technical University, 2019.