46 REFFERENCES 1) R.G. Budynas, J.K. Nisbett, 2008. Shigley’s Mechanical Engineering Design Eighth Edition, McGraw-Hill. 2) D.G. Ullman, 2003. The Mechanical Design Process Third Edition, McGraw-Hill. 3) D.G. Ullman, 2003. The Mechanical Design Process Third Edition, McGraw-Hill. 4) Callister W.D, 2003, Materials Science and Engineering an Introduction, 6th Edition, Wiley 5) Juvinall, R.C. and Marshek, K.M. 2000. Fundamentals of machine component design. New York: John Wiley and Sons. 6) Zhang, S. 1999. Stress intensities derived from stresses around a spot weld. International Journal of Fracture. 99: 239-257. 7) Agerskov, H. and Nielsen, J.A. 1999. Fatigue in steel highway bridges under random loading. Journal of Structural Engineering ASCE. 125(92): 152-162. 8) www.technologystudent.com/prddes1/prddex1