Browsing by Author "Palanikumar, P."

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Design and Fabrication of Block Stiffened Frame
(The Aeronautical and Astronautical Society of the Republic of China, 2025) Bangaru, P.; Kaliveeran, V.; Raveesh, R.M.; Palanikumar, P.; Kundapura, S.
This research introduces a block-stiffened frame for accurate load measurements by reinforcing SS304 rigid blocks along SS304 thick strips. The frame achieves variable stiffness without recalibration, making it more adaptable. Rectangular rosettes are mounted along the longitudinal direction of the frame to measure transverse or tangential loads. Stress analysis is carried out using both finite element analysis (FEA) and experimental methods with both essential and non-essential boundary conditions. Specific locations on the outer surfaces of the block-stiffened frame are examined to compare stress results from finite element analysis and experiments, which confirms a strong agreement between the two methods. The results demonstrate that the frame remains stable under repeated loadings, making it suitable for multiple applications, especially in aerospace structures. Unlike conventional stiffened beams, this novel design easily adjusts stiffness, making load calibration flexible, efficient and adaptable. © 2025 The Aeronautical and Astronautical Society of the Republic of China. All rights reserved.
Effect of sliding speed and rise in temperature at the contact interface on coefficient of friction during full sliding of SS304
(Elsevier Ltd, 2019) Palanikumar, P.; Gnanasekaran, N.; Subrahmanya, K.; Kaliveeran, V.
The present study focuses on the effect of sliding speed and rise in temperature on the coefficient of friction at the contact interface of SS304 alloys subjected to full sliding. Dry sliding experiments were conducted on Rotatory Type Pin on Disk Tribometer. Pins of 3 mm radius and 165 mm diameter circular disk having flat surface were fabricated to simulate Hertzian contact configuration. Experiments were conducted at three different sliding speeds of 1 m/s, 2 m/s and 3 m/s under constant normal load of 1 kg. All the experiments were conducted up to sliding distance of 100 m. From the full sliding experiments, the coefficient of friction decreased with increase in sliding speed and the stabilized coefficient of friction for SS304 alloy was in the range of 0.15-0.28. The temperatures due to friction were measured using K-type thermocouples and they were located to the pins at 4 mm and 7 mm distance from the contact surface. The temperature at the contact surface during dry sliding experiment was obtained from the acquired data using inverse heat transfer method. Temperature measured at different locations along the longitudinal axis of the pin increased with increase in sliding speed and sliding distance. The increase in temperature at the contact interface was observed due to increase in friction at the contact interface during sliding. The temperature had shown stabilized trend, when the coefficient of friction curve got stabilized during sliding process. Â© 2019 Elsevier Ltd.
Identification of effective location of thermocouples from the contact interface
(Elsevier Ltd, 2019) Palanikumar, P.; Gnanasekaran, N.; Subrahmanya, K.; Kaliveeran, V.
This paper describes an experimental and analytical investigation of the temperature rise at the contact interface which occurs during dry sliding of SS304 alloy. Experiments were conducted on rotatory type pin on disk tribometer. Cylindrical pin of 3 mm radius of contact and 165 mm diameter circular disk having flat surface were utilized to simulate Hertzian contact configuration. Rise in contact interface temperature due to sliding was measured using K-type thermocouples which are attached to the pin at 4 mm and 7 mm distance from the contact surface. The temperature at the contact surface during dry sliding experiment was calculated from the measured temperature data obtained from thermocouple pasted at 4 mm and 7 mm locations using inverse heat transfer method. Heat measured at different locations along the longitudinal axis of the pin increased with sliding distance. The temperature data obtained from finite element analysis is verified by comparing it with experimental results to identify effective location of thermocouples to measure the contact interface temperature. Â© 2019 Elsevier Ltd.