THE WELD PROFILE EFFECT ON STRESS （焊接概要对应力的影响）.pdf

th 15 International Research/Expert Conference ”Trends in the Development of Machinery and Associated Technology” TMT 2011, Prague, Czech Republic, 12-18 September 2011 THE WELD PROFILE EFFECT ON STRESS CONCENTRATION FACTORS IN WELDMENTS Zoran D. Perović Department of Mechanical Engineering, University of Montenegro George Washington s/n, 81000 Podgorica Montenegro ABSTRACT   The assessment of beneficial effects of weld geometry modification methods is considered in this paper. Since all these methods significantly increaese weld toe radius, its influence on stress concentration factors is analised. The dependance of theoretical stress concentration factors vs. weld toe radius was determined by using both finite element analisys and photoelasicity method for various types of welded joints. Ratio of coresponding values of fatigue stress concentration factors of as- welded and improved joint, determined by using empirical formulas including also hardness in heat affected zone, gives magnitude of beneficial effects of mentioned weld improvement methods. The results obtained by these calculations for one type of welded joints are compared with experimental results reported in literature. Keywords: welded joints, stress concentration factor, weld profile, assessment of beneficial effects of weld geometry modification methods 1. INTRODUCTION The fatigue fracture of structural details subjected to cyclic loads mostly occurs at a critical cross section with stress concentration. In a welded joints fatigue crack initiates at the weld toe and propag