applied fracture mechanics

294Applied Fracture Mechanics2,6plastic constraint factor C2,42,221,81,61,4Pipes:X52 - 820/10.2X65 - 820/10.7X70 - 1018/11.7X70X65X65X52X70C = 2.56(a/t)+0.531,210,3 0,35 0,4 0,45 0,5 0,55 0,6 0,65 0,7 0,75 0,8relative crack depth a/tFigure 4. Plastic constraint factor, C, as affected by the relative crack depth, a/t-0,5Q parametr-0,6-0,7-0,8Pipes:X52 - 820/10.2X65 - 820/10.7X70 - 1018/11.7 X70 X70X65X52X65Q = 0.32(a/t) - 0.83-0,9-10,3 0,35 0,4 0,45 0,5 0,55 0,6 0,65 0,7 0,75relative crack depth, a/tFigure 5. Parameter Q, as affected by the relative crack depth, a/t