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Evaluating the stresses of a stepped unrounded D-ring under uniform squeeze rate and internal pressure by photoelastic experimental hybrid method

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Abstract

The stresses that develop in a stepped unrounded D-ring loaded with internal pressures at a 20% squeeze rate are analyzed using the photoelastic experimental hybrid method. The analysis demonstrated that the contact stresses on both the upper and front sides of the Dring increased as the applied internal pressure increased, with the magnitudes of σX/pi and σY/pi being considerably higher than those of τXY/pi. Moreover, as applied internal pressure increased, the semi-circular portion of the D-ring moved to fill the space ahead of the step before contacting the restraining wall of the front side. The order of magnitude of stresses in region 1 of the front side of the D-ring was lower than those in region 2. At an internal pressure of 3.92 MPa, the contact stresses on the upper side decreased before increasing again at points away from the region of extrusion. The study further showed that a sharp corner in the geometry of the D-ring does not contribute to the generation of detrimental stresses that may lead to failure of the D-ring before extrusion.

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Authors and Affiliations

  1. School of Mechanical Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan, Gyeongbuk, 712-749, Korea

    Jai Sug Hawong & Jeonghwan Nam

  2. Graduate School of Mechanical Engineering, Yeungnam University, 214-1, Dae-dong, Gyeongsan, Gyeongbuk, 712-749, Korea

    Bruno R. Mose, Bernard O. Alunda & Lim Hyun Seok

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  1. Bruno R. Mose
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  2. Jai Sug Hawong
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  3. Bernard O. Alunda
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  4. Lim Hyun Seok
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  5. Jeonghwan Nam
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Correspondence to Jai Sug Hawong.

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Recommended by Associate Editor Seong Beom Lee

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 Korea Society 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., Hawong, J.S., Alunda, B.O. et al. Evaluating the stresses of a stepped unrounded D-ring under uniform squeeze rate and internal pressure by photoelastic experimental hybrid method. J Mech Sci Technol 26, 2603–2616 (2012). https://doi.org/10.1007/s12206-012-0635-9

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  • DOI: https://doi.org/10.1007/s12206-012-0635-9

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