Abstract
Internal stresses occurring in a stepped rounded D-ring compressed to 20% squeeze and pressurized with internal pressures of 0, 0.98, 1.96, 2.94, 3.92 and 4.9 MPa are analyzed using a photoelastic experimental hybrid method. At a pressure of 0 MPa and 20% squeeze, the photoelastic isochromatic fringes of the stepped rounded D-ring were almost symmetrical. As the internal pressure increased, the isochromatics shifted and curved towards the extrusion gap. By supplying a radius of 0.33 mm at the corners of the stepped D-ring, the high stresses at the sharp corners were reduced by up to 25%. These results further indicate that extrusion of the stepped rounded D-ring occurred at an internal pressure of 4.9 MPa which was about 25% higher than the pressure at which the extrusion of the stepped unrounded D-ring occurred.
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Recommended by Associate Editor Seong Beom Lee
Jeong-hwan Nam received the B.S. degree in mechanical engineering in 1986 and the M.S. degree in 1996, both from Yeungnam University in Korea. He received the Ph.D. degree from Saitama Institute of Technology in Japan in 2005. He is currently a Professor at the Department of Railroad Vehicle Engineering at Dongyang University, Yeongju City, Korea. Prof. Nam’s research interests are the areas of mechanical design, stress analysis, and experimental mechanics for stress analysis.
Jai-Sug Hawong received a B.S. degree in Mechanical Engineering from Yeungnam University in 1974. Then he received his M.S. degree and Ph.D. degree from Yeungnam University in Korea in 1976 and from Kanto Gakuin University in Japan in 1990, respectively. Prof. Hawong is currently a professor at the school of Mechanical Engineering at Yeungnam University, in Gyeongsan city, Korea. He served as President of Korean Society of Mechanical Engineering. Prof. Hawong’s research interests include static and dynamic fracture mechanics, stress analysis, experimental mechanics for stress analysis and composite material, etc.
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Mose, B.R., Nam, J.H., Seok, L.H. et al. Internal stress analysis of a stepped rounded D-ring under a uniform squeeze rate and internal pressure using a photoelastic experimental hybrid method. J Mech Sci Technol 27, 2413–2423 (2013). https://doi.org/10.1007/s12206-013-0627-4
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DOI: https://doi.org/10.1007/s12206-013-0627-4