Answer Happy

Problem 2: Static and Fatigue Design of Fillet Welds 4 in 2 in 1020 CD Steel F Welded region, h = in An AISI 1020 CD Steel welded bar is subjected to a fully reversed load F = 10 kips as shown above. Assume that no additional surface finishing was provided after the welding process (as- forged surface finish). Also assume that the member material is well-mixed with the weld metal. Weld material used is E6010 and weld height is h = 3/8 in. AISI 1020 CD Steel: Sut = 68 kpsi, Sy = 57 kpsi AISI 1020 HR Steel: Sut = 55 kpsi, Sy = 30 kpsi E6010 weld material: Sut = 62 kpsi, Sy = 50 kpsi (a) Sketch the weld symbol corresponding to the given weld pattern. (b) Assuming ka = ke = 1, determine the endurance limit (Sc) of the weldment for fatigue life estimation. Briefly justify all your choices including Marin factors ka, ky, k, and material properties used in the analysis. (c) Determine the infinite fatigue life factor of safety. (d) Does the weldment have infinite fatigue life? If not, determine the number of cycles to failure. Final Answers: (a) Weld arrow with a triangle on both sides of the arrow. (b) Se = 16.775 kpsi, ka = 0.61, all other Marin factors are 1 (b) 0.76 (d) 175000 cycles