https://hdl.handle.net/20.500.12960/22 2026-05-25T00:24:05Z 2026-05-25T00:24:05Z Yin, Ran Zhang, Shunxin Jasim, Dheyaa J. Salahshour, Soheil Eftekharmanesh, Shabnam https://hdl.handle.net/20.500.12960/1802 2025-11-21T06:12:17Z

Fabrication and numerical analysis of non-metallic orthopedic prostheses using ultrasound techniques for reducing infection in sports-related injuries Yin, Ran; Zhang, Shunxin; Jasim, Dheyaa J.; Salahshour, Soheil; Eftekharmanesh, Shabnam Joint replacement has garnered considerable attention as a medical intervention for addressing sports-related joint injuries, offering the potential to restore sports activities and enhance quality of life. However, prioritizing safety measures and injury prevention during exercise is crucial. The increasing prevalence of infections in knee arthroplasty surgeries is a significant concern for both patients and surgeons, emphasizing the necessity for implants with proven efficacy against periprosthetic joint infections (PJI). In this study, two samples were prepared: sample 1 comprised pure copper nanoparticles, while sample 2 consisted of copper nanoparticles supplemented with titanium nanoparticles (TiNP) using the powder metallurgy (PM) technique. The copper prosthesis was characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), and compressive strength tests. The biological behavior of the samples was evaluated in simulated body fluid (SBF) and phosphate buffer saline (PBS) over 3 months. The results demonstrated that the fabricated copper prosthesis exhibited a mesoporous microstructure, with a specific surface area ranging from 150 to 200 (cm2/g). The samples displayed porosity levels of 25 % to 32 %, with pore volumes ranging from 50 to 100 nm. The addition of TiNP to the copper nanoparticles reduced the specific surface area and pore volume of the prosthesis. Cell viability and electrical conductivity assessments revealed the formation of a thin apatite layer on the surface of the copper sample with added titanium nanoparticles. This study leverages the unique capabilities of ultrasound technology to fabricate and evaluate the performance of these novel prosthetic components. The inclusion of TiNP decreased the dissolution rate and increased apatite formation. Moreover, the mechanical properties of the prosthesis improved, and its biological behavior was enhanced, resulting in the development of a beam-shaped biological implant that was analytically analyzed. The addition of approximately 10 wt% TiNP was found to be effective in improving the mechanical and biological properties of the copper-titanium implant.

Farzad Abdi Aazam Ghasemi Alireza Ariaei S. Ali Eftekhari Mehrdad Nasr Mohamad Khaje Khabaz Soheil Salahshour https://hdl.handle.net/20.500.12960/1769 2025-04-11T12:12:29Z 2025-01-01T00:00:00Z

Free vibration and buckling analysis of axially functionally graded tapered Timoshenko beams using B-spline-based isogeometric analysis Farzad Abdi; Aazam Ghasemi; Alireza Ariaei; S. Ali Eftekhari; Mehrdad Nasr; Mohamad Khaje Khabaz; Soheil Salahshour This study considers Timoshenko beam theory and the isogeometric analysis method to investigate the free vibration and buckling of axially functionally graded (AFG) tapered beams. The governing equations are obtained from the kinematic assumptions of Timoshenko beam theory and Hamilton's principle. The isogeometric analysis approach is implemented to solve the motion equations. One-dimensional B-spline basis functions are used to estimate the displacement field, describe the geometry, and illustrate the deformed shapes of the beam. Due to suffering the isogeometric approach from the shear locking phenomenon, the selectively reduced integration is applied. It is shown that this method can mitigate the effect of shear locking. In this attempt, the effect of material non-homogeneity parameters, mass density, Young's modulus, and taper ratio on the critical buckling loads and natural frequencies are considered for various boundary conditions. Several numerical examples show the accuracy and reliability of this method. The obtained results are in accord with the ones in the related articles and can be adopted as future reference solutions.

2025-01-01T00:00:00Z Geng, Lishan Ali, Ali B.M. Babadoust, Shahram Kumar, Anjan Abdullaeva, Barno Hussein, Rasha Abed Salahshour, Soheil Esmaeili, Sh. https://hdl.handle.net/20.500.12960/1765 2025-04-11T11:16:49Z 2025-01-01T00:00:00Z

Modeling the influence of external heat flux on thermal characteristics of the silica aerogel/paraffin in a cylindrical atomic duct Geng, Lishan; Ali, Ali B.M.; Babadoust, Shahram; Kumar, Anjan; Abdullaeva, Barno; Hussein, Rasha Abed; Salahshour, Soheil; Esmaeili, Sh. As the price of fuel rises and the environmental impact of greenhouse gases intensifies, a larger population is opting for alternative sources of sustainable energy. Currently, scientists are facing challenges in discovering an energy-saving method that is effective in diverse scenarios and is user-friendly. Many individuals are interested in using materials that can transition between solid, liquid, and gas states. The objective was to use these materials for heat retention. Silica aerogels exhibit effective thermal regulation, regardless of whether the environment is hot or cold. Phase change materials are substances that store thermal energy effectively and play a crucial role in maintaining temperature stability. This research explored how external heat flux affected the behavior of a tube filled with silica aerogel and phase change materials. Additionally, we incorporated CuO nanoparticles to evaluate their impact on the system. The study utilized LAMMPS software to perform molecular dynamics simulations for this purpose. To achieve our goal, we evaluated various aspects of virtual structure, which can be influenced by factors, such as density, velocity, temperature profile, heat flux, thermal conductivity, and the duration of filling and emptying. The findings indicate that as external heat flux increased, maximum density decreased to 0.1364 atoms/ų. Conversely, thermal conductivity, maximum velocity, and temperature increase to 1.97 W/m·K, 0.0138 Å/fs, and 649 K, respectively. Also, with maximum external heat flux, charging time decreases to 5.94 ns, while discharge time is recorded at 8.56 ns. Increased external heat flux resulted in greater thermal energy transfer to the material, causing the atoms to vibrate more vigorously and collide more frequently.

2025-01-01T00:00:00Z Vini, Mohammad Heydari Basem, Ali Daneshmand, Saeed Jasim, Dheyaa J. Hekmatifar, Maboud Salahshour, Soheil https://hdl.handle.net/20.500.12960/1761 2025-04-10T08:39:13Z 2025-01-01T00:00:00Z

An innovative approach combination of powder metallurgy and accumulative press bonding to fabricate Al/ graphite nanocomposites and investigate the tribological and wear properties Vini, Mohammad Heydari; Basem, Ali; Daneshmand, Saeed; Jasim, Dheyaa J.; Hekmatifar, Maboud; Salahshour, Soheil In this study, Al/Gr Nanocomposites (NC) were fabricated using an innovative approach that is a combination of powder metallurgy (PM) and accumulative press bonding (APB). By this combination method, many of defects are removed from the composite matrix which improves the mechanical properties. The APB process is a unique technique that made it possible to create NCs with distinct properties. In simpler terms, this process involves compressing a series of overlapping bulky samples that achieves a specific reduction ratio, such as 50 %. It is worth noting that extensive research has been done to understand the properties of Al/Gr-NCs comprehensively. By increasing the Gr value up to 10 %, hardness and friction coefficient dropped and wear rate increased by 23 %, 214 % and 37 %, respectively. Focusing on the analysis of microstructural, and tribological properties (TP), with special emphasis on the effect of Gr content as an additive component. In addition, the use of a scanning electron microscope (SEM) has facilitated the study of the surface and microstructure of tribo–NC. The result of this study revealed desirable behaviors. It was observed that with the increase of Gr content, the hardness and friction coefficient (FC) of the NC samples decreased, while the density and WR rate of the samples increased. These results indicate the importance of Gr addition in adjusting the MP and TP of NCs. Finally, the combination of PM and the APB process offers a promising way to fabricate nanoparticle (NP)-reinforced materials with desirable MP.

2025-01-01T00:00:00Z