Omar El Khatib- Dr.-Ing.
- Research Associate at TU Bergakademie Freiberg
Omar El Khatib
- Dr.-Ing.
- Research Associate at TU Bergakademie Freiberg
About
11
Publications
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Introduction
Current institution
Publications
Publications (11)
![Schematic illustration of the assumed microstructural variables, [12]...](publication/382283153/figure/fig2/AS:11431281307462945@1738681329543/Schematic-illustration-of-the-assumed-microstructural-variables-12-John-Wiley-Sons_Q320.jpg)
This work introduces a novel scale-bridging method between a continuum thermodynamics constitutive model and a lumped system-level model for magnetic shape memory alloys (MSMA). With this method, system models for real-time operations are generated based on virtual experiments using the constitutive model. The proposed method addresses the fact tha...
Ductile materials are used in many applications such as hydrogen storage and transport, energy plants and additively manufactured components. High safety standards are vital for such applications, which underline the necessity of thoroughly investigating ductile failure to ensure safety and increase components efficiency. Ductile failure is mainly...
Shape memory alloys (SMAs) are a unique class of multifunctional materials, which exhibit distinctive thermomechanical properties. They are primarily characterized by their ability to recover their original shape under stress and temperature‐controlled loading scenarios. This exceptional property is attributed to the phase transformation that occur...
Damage mechanics models exhibit favorable properties such as the intrinsic influence of stress triaxiality on damage evolution and the prediction of crack initiation as well as propagation leading to structural failure. However, their application requires advanced expertise hindering the transfer of these models into industrial practice, especially...
Damage mechanics models exhibit favorable properties such as the intrinsic influence of stress triaxiality on damage evolution and the prediction of crack initiation as well as propagation leading to structural failure. However, their application requires advanced expertise hindering the transfer of these models into industrial practice. Especially...
![Finite element mesh of the boundary layer model [44]. Reprinted by...](publication/352847384/figure/fig1/AS:11431281307408426@1738677174626/Finite-element-mesh-of-the-boundary-layer-model-44-Reprinted-by-permission-from_Q320.jpg)
During their applications, ferroelectric devices are subjected not only to electromechanical loading but also to thermal fields, inducing additional stresses and impairing their functionality. Additionally, internal heat generation can occur by the dissipation of the inelastic work resulting from ferroelectric hysteresis. Moreover, at extreme elect...
The fracture behavior of ferroelectric materials is investigated under cyclic electric fields using a boundary layer approach for small scale switching conditions. By means of a micromechanical ferroelectric material model the coupled thermo-electro-mechanical fields at the crack tip are analyzed. Besides external loading, the internal heat generat...
The influence of thermal fields on the electromechanical behavior of ferroelectric ceramics under cyclic electric loading is presented. To predict the temperature effect, a 3D micromechanical model for tetragonal domain switching is extended by including thermal effects. Numerical simulations were done through the finite element program Abaqus with...
Layered structures have been suggested to improve the thermal shock resistance of refractories. Owing to the fast temperature increase of the outer surface, high thermal tensile stresses occur inside the refractory. Depending on the intensity of thermal shock and the material, cracks may arise and grow through and between the layers. To study the b...
