Fatigue Strength of Friction Stir Welded Aluminium Profile for Train Car Application

摘要: Friction stir welded aluminium alloys are used for many applications in transportation. In these the material is frequently subject to varying load conditions, making fatigue failure a critical issue. scope of this paper, performance friction profiles Al-alloy 6005A has been investigated. A profile that railway car wall side panels was chosen. The were joined together with welding method at both sides profile. 3-point bending tests performed profiles. Stress ranges giving after 10 5 6 cycles stress ratio R=0.1 used. With FEM simulations positions crack initiation and identified parent metal. These all narrow radii fact, failures always occurred positions. maximum varied somewhat between spite this, cracking took place six different indicating had balanced design. von Mises as determined about 50% higher than corresponding uniaxial data same number cycles. This suggests cracks initiate places high stresses but propagate into areas lower stresses. FSW joint lap-butt sharp notch (interface work pieces) next weld nugget. Since welded, such notches appeared on sides. most initiated propagated form where centre placed. However, never there, i.e. complete fracture not observed. direction which perpendicular plane direction. On opposite position no