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JWJ > Volume 33(6); 2015 > Article
Journal of Welding and Joining 2015 December;33(6) :49-54.
Published online December 31, 2015.
doi:https://doi.org/10.5781/JWJ.2015.33.6.49
Fatigue Life Prediction of Non-Load-Carrying Cruciform Welded Joint using Master S-N Curve based on Structural Stress Approach
Si-Young Kwak*
*e-Design Group, Korea Institute of Industrial Technology, Incheon 21999, Korea (Robotics&Virtual Engineering, University of Science and Technology)
Correspondence: Si-Young Kwak  Email: vlvwlw@kitech.re.kr
  Published online December 31, 2015
ABSTRACT
Welding process is of importance to assemble products or structures, but also the process is structural weakness due to stress concentration in welding joint. The fatigue design of welded joint requires time & labor consuming fatigue test because the fatigue life is various according to the depth of joint, joint type and load type etc. In fatigue design codes, they guide to classify welding joints with their shape( BS7608, IIW Documents) and provide fatigue assessment information. In terms of numerical method for fatigue analysis, it is also difficult to decide the stress peak in joint because of mesh sensitivity which means that stress value is varies with element type or size on stress concentration zone. Hot-spot method is used generally, but Battelle of United States proposed Master S-N Curve based on structural stresses converted by mechanical equilibrium theory. In this research, we extracted master S-N curve from Battelle’s fatigue test DB including test data of various welding joints to apply on Non-Load-Carrying cruciform Joint. Comparing fatigue results between the case of using normal stress and case of structural stress cor the cruciform Joint, The suggested Battelle method showed successive results.
Keywords: Arc weld | Fatigue | Structural stress | Cruciform welded joint
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