Analysis of ratcheting by using different yield criteria and kinematic hardening models for uniaxial and biaxial loading

İşler, Mert
Ratcheting, the accumulation of plastic strain under cyclic loading, will be investigated for uniaxial and biaxial loading in this study. The simulations of ratcheting will be carried on for different yield criteria and kinematic hardening rules. The corresponding stress-strain relations will be developed and used in the numerical analysis by implementing subroutines to a commercial finite element software. The numerical results will be compared with the experimental ones to evaluate the applicability of the constitutive equations that are obtained by using the selected yield criteria and kinematic hardening rules.


Implementation of metal-based microchannel heat exchangers in a microrefrigeration cycle, and numerical and experimental investigation of surface roughness effects on flow boiling
Jafari Khousheh Mehr, Rahim; Okutucu Özyurt, Hanife Tuba; Ünver, Hakkı Özgür; Department of Mechanical Engineering (2015)
A microscale vapor compression refrigeration cycle has been constructed for possible application in the thermal management of compact electronic components. The micro-evaporator and micro-condenser components have been fabricated using wire electron discharge machining and micromilling, respectively. Three microevaporators have been manufactured with different surface roughness for the experimental and numerical investigation of roughness effect on nucleate flow boiling in microchannels. In the numerical pa...
Eraslan, Ahmet Nedim (2016-01-01)
The stress response of axially constrained two-layer composite tubes under cyclic loading of external pressure is investigated in this study. Elastic and elastoplastic stress states for the tube assemblies are examined by developing a mathematical model based on Tresca's yield criterion, its associated ow rule, and linear strain hardening. Using this model, the composite tubes with different dimensions are analyzed under one cycle of loading, unloading, and reloading of external pressure. It is observed tha...
Modeling and computational simulation of adsorption based chemical heat pumps
Yurtsever, Ahmet Onur; Karakaş, Gürkan; Uludağ, Yusuf (2013-01-10)
In this study a methodology is developed for the design of a packed bed reactor to be used in a Chemical Heat Pump (CHP). Adsorption and desorption of ethanol on active carbon packing in the reactor are investigated. Depending on the cycle, i.e. adsorption or desorption, cooling or heating of the reactor material is modeled through transient energy equation. The parameters associated with the vapor-carbon adsorption kinetics are experimentally determined. Then spatial distribution of temperature and adsorbe...
Assessment of improved banded model for spectral thermal radiation in presence of non-gray particles in fluidized bed combustors
Yaşar, Mehmet Soner; Ozen, Guzide; Selçuk, Nevin; Külah, Görkem (2020-07-01)
In this study, Bordbar's banded model is coupled with a 3-D radiation model based on method of lines (MOL) solution of discrete ordinates method (DOM) for modeling of radiative heat transfer in freeboard of METU 0.3 MWt ABFBC test rig where a typical Turkish lignite is fired with and without fly ash recycling. The accuracy and the computational efficiency of the model were assessed by benchmarking its predictions against banded SLW model. Furthermore, in order to show the effect of gas composition on predic...
Analysis of pressure behaviors and flow regimes of naturally and hydraulically fractured unconventional gas reservoirs using multi-linear flow regimes approach
Al-Rbeawi, Salam (2017-09-01)
This paper targets the applicability of multi-linear flow regimes approach in gas reservoirs having multiple porous media: matrix, natural fractures, and hydraulic fractures. The approach attempts to understand pressure profiles and flow regimes developed in some of unconventional shale layers that have already been naturally fractured. In this paper, the main focus is given to fluid flow phenomenon from the matrix towards naturally induced fractures and from these fractures to the hydraulic fractures. Stud...
Citation Formats
M. İşler, “Analysis of ratcheting by using different yield criteria and kinematic hardening models for uniaxial and biaxial loading,” M.S. - Master of Science, Middle East Technical University, 2018.