Determining surface residual stress in steel sheets after deep drawing and bulging processes

Adıgüzel, Sinem
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 Barkhausen Noise. The experimental and simulation results were correlated with each other.


Analysis of effects of temperature variation on deep drawing process using different constitutive laws
Demirkol, Rasih Hakan; Darendeliler, Haluk; Department of Mechanical Engineering (2019)
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 crite...
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...
Effect of swaging on microstructure and tensile properties of W-Ni-Fe alloys
DURLU, NURİ; Caliskan, N. Kaan; Bor, Sakir (Elsevier BV, 2014-01-01)
The objective of this study was to investigate the effect of swaging on the microstructure and tensile properties of high density two phase alloys 90W-7Ni-3Fe and 93W-4.9Ni-2.1Fe. Samples were liquid phase sintered under hydrogen and argon at 1480 degrees C for 30 min and then 15% cold rotary swaged. Measurement of microstructural parameters in the sintered and swaged samples showed that swaging slightly increased tungsten grain size in the longitudinal direction and slightly decreased tungsten grain size i...
Variation of back-calculated breakage rate parameters in Bond-mill grinding
Hoşten, Çetin; Avsar, C (Wiley, 2004-10-01)
The variation of breakage rates with grinding environment is important in the analysis and simulation of various grinding processes. In particular, computer simulation of the labor-intensive experimental Bond grindability test requires reliable estimates of breakage rate and distribution parameters from a minimum amount of experimental work. This paper was aimed at studying the variation of breakage rate parameters in the Bond mill. Batch kinetic experiments with monosize feeds and standard locked-cycle Bon...
Simulation of orthogonal metal cutting by finite element analysis
Bil, Halil; Kılıç, Engin; Tekkaya, Erman; Department of Mechanical Engineering (2003)
The aim of this thesis is to compare various simulation models of orthogonal cutting process with each other as well as with various experiments. The effects of several process parameters, such as friction and separation criterion, on the results are analyzed. As simulation tool, commercial implicit finite element codes MSC.Marc, Deform2D and the explicit code Thirdwave AdvantEdge are used. Separation of chip from the workpiece is achieved either only with continuous remeshing or by erasing elements accordi...
Citation Formats
S. Adıgüzel, “Determining surface residual stress in steel sheets after deep drawing and bulging processes,” M.S. - Master of Science, Middle East Technical University, 2011.