search query: @supervisor Tuhkuri, Jukka / total: 83
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Author: | Seppälä, Joona |
Title: | Modeling of ratcheting - a comparison of the approaches of Chaboche and Ohno & Wang |
Publication type: | Master's thesis |
Publication year: | 2012 |
Pages: | ix + 81 s. + liitt. 27 Language: eng |
Department/School: | Sovelletun mekaniikan laitos |
Main subject: | Lujuusoppi (Kul-49) |
Supervisor: | Tuhkuri, Jukka |
Instructor: | Santaoja, Kari ; Schwarz, Waldemar |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
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Location: | P1 Ark Aalto 3990 | Archive |
Abstract (eng): | In this Master's Thesis, two ratcheting models, Chaboche and Ohno & Wang (OW), were compared to the Armstrong-Frederick (A-F) model, which is based on nonlinear kinematic hardening. The viscoplastic equations describing the material model were numerically implemented into MATLAB in the uniaxial case using the implicit Euler time integration scheme and Newton's method as the root-finding algorithm. A convergence analysis was also carried out for the numerical scheme. At first, the model parameters and the behaviour of each model were examined and secondly, the models were compared under uniaxial, monotone load conditions as well as under uniaxial, cyclic load conditions with different values of mean stress. The A-F model predicted a steady-state of ratcheting; both the Chaboche and O-W models produced much less accumulating ratcheting strain depending on the mean stress, and the Chaboche model also predicted a shakedown. The O-W model was preferred due to its simple definition and implementation. |
ED: | 2012-07-04 |
INSSI record number: 44790
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