Finite Element Methods, Composite Material, Advanced Material, Solid Mechanics, Nanomechanics.
- Ph.D., PhD of Mechanical engineering, university of Tehran [Tehran - Iran]
Articles
Publication Date: 2024
Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems (23977922)238(1-2)pp. 40-46
Nanocomposites have low weight and the improvement in properties is significant due to their nanostructure. Finding the properties of nanocomposites by experimental or computational methods is the priorities of researchers. Numerous studies on stress-strain behavior, strength, elastic-plastic behavior, bending, buckling, torsion, and other material behavior have been performed using the finite element method, which was reviewed in this study. In all the researches, the results obtained from the finite element method were in proper agreement with the experimental and analytical results. The use of the finite element method allows further studies on nanocomposites, which may not be possible in an experimental method or may require a lot of time and cost. In the following, a model of copper/CNT nanocomposite was studied using finite element method. The model was composed of a CNT in a box of pure copper. The stress contour and displacement contour of model was obtained and the results showed a 135% growth in nanocomposite Young’s module. © IMechE 2022.
Publication Date: 2024
Materials Today Communications (23524928)38
The high practicality of Al-Cu alloy is the key reason it is highly used across most industries. In this research, the primary objective was to optimize the mechanical properties of the aluminum-copper alloy by incorporating Ni nanoparticles. The study employed a combination of Ni nanoparticles with the alloy and utilized a mixture design of experiments to determine the most effective Al-Cu-Ni alloy composition. This composition was validated through molecular dynamics simulation. Mechanical tests were carried out on the Al-6 %Cu-1 %Ni alloy at different strain rates and temperatures. The findings indicated that an increase in temperature led to a reduction in tensile properties. Moreover, the strength of the Al-6 %Cu-1 %Ni alloy increased with higher strain rates while the stiffness remained relatively constant. Additionally, a specialized deep neural network with two hidden layers was employed to predict the mechanical properties of the Al-Cu-Ni alloy. The optimal parameters for this deep neural network were determined using the Taguchi method. © 2023
Publication Date: 2024
Scientia Iranica (23453605)31(20)pp. 1880-1888
Modeling and determining the optimal conditions for the Jet Electrochemical Machining (Jet-ECM) process is critical. In this study, a hybrid approach combining numerical and Design of Experiments (DOE) methods have been applied to model and determine the optimal conditions for Jet-ECM. The voltage (V), inner tool diameter (I), initial machining gap (G), and electrolyte conductivity (C) are considered input variables. Additionally, dimensional accuracy (E) and machining depth (D) are response variables. Twenty-seven numerical simulations have been performed using the Box–Behnken design to implement the Response Surface Methodology (RSM). Consequently, two mathematical models have been obtained for these response variables. The effects of the input variables on the response variables are investigated using statistical techniques such as variance analysis. Furthermore, the desirability function approach has been applied to determine the optimal conditions for dimensional accuracy and depth of machining. The results show that the optimal values for achieving maximum depth of machining while maintaining a dimensional accuracy of 0.05 mm are as follows: electrolyte conductivity of 8 S/m, voltage of 36.9 V, initial machining gap of 200 μm, and inner tool diameter of 0.4 mm. © 2024 Sharif University of Technology.
Publication Date: 2024
Archives of Computational Methods in Engineering (1134-3060)31(4)pp. 2417-2429
The main features of superalloys are included good stability and strength at high temperatures (excellent mechanical strength), creep resistance at high temperatures, resistance to corrosion and oxidation at high operating temperatures, and resistance to thermal deformation at high operating temperatures. Superalloys have different properties, meaning that each alloy has its unique chemical and mechanical properties, so it is necessary to find the physical, mechanical, and chemical properties of superalloys. There are several ways to do this: The experimental method, computational and analytical method, and molecular dynamics simulation method. In this research, Mechanical properties of superalloys have been studied using molecular dynamics simulation. Tensile-pressure behavior of the superalloys, dislocations, hardness behavior, elastic-plastic behavior, crack growth, fatigue properties, and creep behavior have been considered. Eventually, some challenges and future work will be discussed. © The Author(s) under exclusive licence to International Center for Numerical Methods in Engineering (CIMNE) 2023.
