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Makine Mühendisliği Bölümü

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Browsing Makine Mühendisliği Bölümü by Author "284521"

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    Article
    Citation Count: Totuk, Onat Halis; Mistikoğlu, Selçuk. (2023). "Modeling and Optimization of a Peano-HASEL Actuator Peristaltic Pump", Journal of Scientific and Industrial Research, Vol.82, No.7, pp.776-782.
    Modeling and Optimization of a Peano-HASEL Actuator Peristaltic Pump
    (2023) Totuk, Onat Halis; Mistikoğlu, Selçuk; 284521
    Peano-Hasel (hydraulically amplified self-healing electrostatic) pumps are crucial devices with unique mechanisms and versatile applications. They simulate muscle contractions to move fluids or materials through tubes. The Peano-Hasel method, a specific design, achieves flow by compressing a segmented tube externally. Exploring the design aspects of Peano-Hasel pumps can lead to advancements in optimizing their performance, efficiency, reliability, and control systems. This paper presents a novel method of peristaltic pumping on soft pipes using Peano-HASEL actuators. In the study, a design evaluation of an external ring-type pump over a PDMS (Polydimethylsiloxane - commonly referred to as silicone) tube containing Newtonian fluids is made, and a novel multi-pouch ring shape design is proposed. Our method utilizes a peripheral and compact design that allows for more efficient sinusoidal pumping action. The close proximity of the rings in the longitudinal direction enhances the effectiveness of the pumping process. The actuator is analytically modeled and optimized for maximum areal contraction and flow rate using a differential evolution algorithm. A MATLAB Simulink Simscape model is generated, and the system is simulated. As a result, an optimal solution for the number of pouches was found to be eight, considering ring geometry and applicability. It was also seen from the simulation that a sinusoidal squeezing scheme of a ring-type pump creates the desired action. Based on the analytical model presented, it has been demonstrated that the optimal flow rate is achieved when there are eight pouches, and they are fully circular after being energized.
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    Conference Object
    Citation Count: Haghshenas, M...et al (2020). "Small-scale mechanical properties of additively manufactured Ti-6Al-4V", Solid Freeform Fabrication 2017: Proceedings of the 28th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2017, pp. 134-147.
    Small-scale mechanical properties of additively manufactured Ti-6Al-4V
    (2020) Haghshenas, M.; Totuk, O.; Masoomi, M.; Thompson, S.M.; Shamsaei, N.; 284521
    This article aims at studying microstructure and nano/micro-scale mechanical responses of Ti-6Al4V fabricated using a Laser-based Powder Bed Fusion (L-PBF) method. To this end, an instrumented depth-sensing nanoindentation system has been used to assess hardness, Young's modulus, strain rate sensitivity and rate dependent plastic deformation of the alloy at different build Orientations (in the Z-plane and X-plane) at ambient temperature. Indentation tests were conducted at constant proportional loading rate of 15 mN/s in a depth-controlled (hind=2000 nm) testing regime. The Microstructure characterizations were performed using optical and scanning electron microscopy to assess the correlations to the mechanical properties achieved by the nanoindentation testing to better establish structure-property relationships for L-PBF Ti-6Al-4V. It is expected that the fine microstructure, developed by fast solidification during the L-PBF process, to directly contribute to the nanoindentation measurements at different strain rates.