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elastoplastic
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Elasto-Plastic Design of Thick-Walled FG Vessels under Pressure or Temperature Gradient Loadings
, M.Sc. Thesis Sharif University of Technology ; Kargarnovin, Mohammad Hossein (Supervisor)
Abstract
Nowadays functionally graded materials have many applications in various industries. One of these applications can be the manufacturing of thick-walled vessels. Thick-walled vessels under internal pressure and high temperatures gradient require materials with higher strength, like Functionally Graded Materials (FGM) and can be reinforced by some mechanical processes like autofrettage. In this process under certain loading some part of vessels enters into plastic zone and upon unloading some residual stresses will be generated. Moreover it is very important to find out the depth of this plastic zone, In addition, minimizing the stress distribution vs. depth of plastic zone under applied...
Elasto-plastic Behavior, Buckling and Stability Analysis of Sandwich Cylindrical Shell Panel under Axial Compression and Lateral Uniform Pressure
, Ph.D. Dissertation Sharif University of Technology ; Kargarnovin, Mohammad Hassan (Supervisor) ; Fallah Rajabzadeh, Famida (Supervisor) ; Naghdabadi, Reza (Co-Advisor)
Abstract
In this dissertation, elasto-plastic analysis of deformation, buckling and stability of sandwich cylindrical shell panel with orthotropic core under axial compression and lateral uniform pressure is perfomed. A new study on behavior of sandwich cylindrical shell panels under elasto-plastic deformation is done. In contrast of available analyses in which the core layer assumed to be isotropic and elastic, present analysis includes the sandwich shell having orthotropic elasto-plastic core. The deformation analysis of sandwich shell is performed based on two different theories; one is adopted for sandwiches having a stiff core and the other is proper for sandwiches having a flexible core. Based...
A Machine Learning-Based Atomistic-Continuum Multi-Scale Modeling of Perfect and Defective Ni-Based Superalloy in Elastoplastic Regions
, M.Sc. Thesis Sharif University of Technology ; Khoei, Amir Reza (Supervisor)
Abstract
In this paper, a machine learning-based atomistic-continuum multi-scale scheme is introduced to model the materials' geometrically and materially nonlinear behavior. The kinematic and energetic consistency principles are employed to link the atomistic and continuum scales. In order to establish the kinematic consistency principle, the periodic boundary condition is implemented for the atomistic RVE. The Ni-based superalloy, including 0 to 3% porosity, is considered for the models. Several parameter analysis is done to distinguish the proper atomistic RVE to be used in multi-scale models. The data set, including the stress-strain samples, is generated through molecular dynamics analysis...