Determine the numbers of cycles to unstable crack growth, in both materials, using the data shown in Table Q3, for an applied cyclic load of 30 kN (R=0). Assume an initial crack of 0.5 mm in each material. Assume rectangular sections with a thickness of 1 mm for each bar and K = 1.120 [14] Material HAZ PM Young's modulus, E (GPa) 200 200 Table Q3. Data for HAZ and PM materials Paris coefficient (units of MPa, m) A (m) 5 20 9.6x10-11 9.6x10-11 L Paris exponent, m (mm) 3 2.59 20 10 Kic (MPa m) 80 123