Tubular K-Joint under Out-of-Plane Bending

International Journal of Mechanical Engineering

© 2019 by SSRG - IJME Journal

Volume 6 Issue 4

Year of Publication : 2019

Authors : Iberahin Jusoh and Talal S. Mandourah

10.14445/23488360/IJME-V6I4P104

How to Cite?

Iberahin Jusoh and Talal S. Mandourah, "Tubular K-Joint under Out-of-Plane Bending," SSRG International Journal of Mechanical Engineering, vol. 6,  no. 4, pp. 18-22, 2019. Crossref, https://doi.org/10.14445/23488360/IJME-V6I4P104

Abstract:

Joints on a typical structural assembly would experience localized stresses. The area that gives rise to these types of stresses called areas of stress concentration. This paper investigates the effect of outof-plane bending on stress distribution on the K-joint. Finite element model for a gapped K-joint was created followed with out-of-plane load application and joint response analysis thus obtaining stress distribution as presented. The value of stress was increase in the vicinity of the joint due to its discontinuity. This condition give rise to the hot-spot stress within the structure. In this study the effect of out-of-plane loading on variation of Stress Concentration Factor (SCF) for different brace-to-chord diameter ratio, B and brace-to-chord thickness ratio, i for a simple tubular gapped K-joint were investigated. Load case OPB1 is for out-of-plane bending load acting on brace B of the model while load-case OPB2 is for out-of-plane bending load acting simultaneously on braces B and A. Results shows that the highest value of SCF occurred when the brace-to-chord thickness ratio i =0.9 and brace-to-chord diameter ratio, B =0.6 with a magnitude of 4.5468. This is an increment of 78.24% for the same loading parameter on K- joint with i = 0.7. Maximum von-Mises stress experienced by the joint is 86.2318 MPa located at the saddle of the joint under load case OPB1.

Keywords:

Tubular K-joint, chord-brace diameter ratio, out-of-plane bending, structural modelling, SCF analysis

References:

[1] Kuang, J. G., Potuin, A. B. and Leick, R. D., Stress concentration in tubular joints, Offshore Technology Conference, Houston, 4 May 1972, pp. 6-15.
[2] Kuang, J. G., Potuin, A. B., Leick, R.D. and Kahlich, J. L., Stress concentration in tubular joints, Society of Petroleum Engineers Journal, Vol. 17, No. 4, 1977, pp. 287-299
[3] Jusoh, I., Tubular K-joint under in-plane bending, International Journal of Scientific Research, Vol.8(1) – Jan. 2019. pp 2007-2010.
[4] Jusoh, I., SCF analysis of tubular K-joint under compressive and tensile loads, SSRG-International Journal of Mechanical Engineering, Vol.5 (10), Oct. 2018. pp 1-4.
[5] Graff, W. J., Introduction to offshore structures: Design, fabrication, installation. Houston, Texas: Gulf Publishing Company. 1981. 149-200.
[6] Saini, D. S., Karmakar, D and Ray-Chaudhuri, S., A review of stress concentration factors in tubular and non-tubular joints for design of offshore installations. Journal of Ocean Engineering and Science 1 (2016) 186–202.
[7] Morgan, M. R. and Lee, M. M. K., New parametric equations for stress concentration factors in tubular K-joints under balanced axial loading, International Journal of Fatigue. 1997- Vol.19 (4): 309-317.