Feb '23
The IUP Journal of Mechanical Engineering
ISSN: 0974-6536
A 'peer reviewed' journal distributed by EBSCO and Proquest Database
It is a quarterly journal that publishes research papers dealing with Production engineering, Industrial engineering; Materials engineering; Solid mechanics; Solid and structural mechanics; Fluid mechanics; Fracture mechanics; Biomechanics; Metallurgy, Tribology, Heat transfer; Welding technology; Composite materials; Machine design CAD/CAM; Renewable energy technology; Mechanical maintenance; Refrigeration & Air-conditioning; Quality control and Operational research, etc.
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Testing of Thermal Barrier Coatings for Fatigue Life
Thermal Barrier Coatings (TBCs) are crucial in high-temperature applications to improve the performance and durability of components. These coatings protect against heat transfer and damage due to high temperatures, but they can experience fatigue failure from cyclic thermal and mechanical loads. Therefore, testing TBCs for their fatigue life is critical to ensure their reliability and longevity. To test the fatigue life of TBCs, components are subjected to thermal cycling that simulates real-world conditions. The number of cycles required to cause failure is measured to determine the TBC's fatigue life. Fatigue testing results provide valuable information on TBC's durability, reliability and performance. It helps in identifying design and process parameters to enhance performance and reduce risk of failure. Thus, testing TBCs is an essential step to evaluate coatings for high-temperature applications, ensuring their reliability and durability and improving the longevity of protected components.
Hybrid Muffler Transmission Loss Performance: A Wave 1D Approach
The paper focuses on the acoustic performance analysis of several absorptive mufflers types, in terms of Insertion Loss (IL), Transmission Loss (TL), Level Difference (LD) and Noise Reduction (NR); the performance of the muffler is also assessed. One of the key variables frequently employed for acoustic performance measurement of mufflers is TL. The study reviews the absorptive materials and TL prediction by wave 1D tool. The amount of TL transmitted within a muffler is calculated by wave 1D. The combination of both reactive and absorptive muffler is termed hybrid muffler. It is reasonable to anticipate that the hybrid muffler design will offer low pressure drop and broadband high noise attenuation. The TL of the hybrid muffler can be predicted using the load setup of experimental two-load method and wave 1D.
Breaking the Symmetry for Magnetic Reorientation with Perpendicular Magnetic Anisotropy
Magnetic switching with Perpendicular Magnetic Anisotropy (PMA) is a promising method for controlling magnetization in several applications such as magnetic tunnel junctions and magnetic memory. However, incoherence occurs during the PMA switching process, which reduces the switching frequency. Symmetry breaking can help solve this problem. In the study, a field-free strain-mediated method is presented with geometric asymmetry to improve the coherence and the switching speed. To demonstrate this mechanism, a finite element model of 50 nm diameter Ni nanodisk with a sloped surface on a piezoelectric thin film is built. The simulation results show a 65% faster switching speed under the same strain and energy consumption. Finally, the mechanism of symmetry breaking by investigating how film thickness affects energy profiles has also been explored.
Lagrange-Kirchhoff Model for the Deformation of a Coated Taiko Silicon Plate
Internal stress in a film deposited on a plate-like substrate causes the film and substrate pair to warp until the mechanical equilibrium is reached. This condition is reached when both the net force and the resulting bending momenta reach a null value. In this paper, the analytical Lagrange-Kirchhoff model for the deformation of a coated Taiko plate silicon is proposed. Under the conditions of validity of the linear theory of thin plates, the model is in agreement with the experimental data. These results can be extended to other substrates, such as silicon carbide (SiC).
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