Effects of Hole on Crack Growth Behavior of Welded Joints of Aluminum Alloy 2519A
The crack growth simulation model of welded joint of aluminum alloy 2519A was established, which was composed of two regions such as weld seam and base metal. The effects of hole shape, size and location on the crack tip of stress intensity factor were investigated. The results show that the shapes of the holes depend on the minimum angle that between the vertex of the sharp corners with holes center connection and direction of the force. The greater the angle is, the greater stress intensity factor value is. The stress intensity factor increases as the increase of hole size. When it is the minimum constant angle in which between the connection line of holes in the center with the crack tip and crack extension cord, the closer hole is from the crack tip, the stress intensity factor is greater.