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LOCAL STRAIN ENERGY DENSITY AND FATIGUE STRENGTH OF WELDED JOINTS

LOCAL STRAIN ENERGY DENSITY AND FATIGUE STRENGTH OF WELDED JOINTS. Paolo Lazzarin e Filippo Berto Università di Padova, DTG Vicenza. Weld bead geometry cannot, by its nature, be precisely defined. Parameters such as bead shape and toe radius vary from joint to joint.

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LOCAL STRAIN ENERGY DENSITY AND FATIGUE STRENGTH OF WELDED JOINTS

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  1. LOCAL STRAIN ENERGY DENSITY AND FATIGUE STRENGTH OF WELDED JOINTS Paolo Lazzarin e Filippo Berto Università di Padova, DTG Vicenza

  2. Weld bead geometry cannot, by its nature, be precisely defined. Parameters such as bead shape and toe radius vary from joint to joint. • Conventional welding techniques result in very small values for the toe radius. • In the present contribution the weld toe region is modeled as a sharp, zero radius, V-shaped notch. • The intensity of asymptotic stress distributions obeying Williams’ solution are quantified by means of the Notch Stress Intensity Factors (NSIFs).

  3. Mode I stress distribution is (Lazzarin and Tovo, 1998): Mode II stress distribution is:

  4. 2a=180°ground butt welded joints 2a=135°

  5. t d t t F O t F L > 100 d r r keyhole, rs=0.05 mm crack, r=0 +q +q O O Giunti a semplice sovrapposizione

  6. Kullmer, 1992

  7. Kullmer, 1992

  8. u=0 l y,v  v=0 x,u l l

  9. v=0 y,v  u=0 slit x,u l l

  10. Distanza dall’apice(mm)

  11. Errori del 2-3%, con l’eccezione del caso 1 (7%)

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