5-31 Variation of SIF K11, along BD specimen thickness at different Crack
Length/Diameter ratio for [10l] orientation.. . . 57
5-32 Variation of SIF K11, along BD specimen thickness at different Crack
Length/Diameter ratio for [121] orientation.. . . 57
6-1 Schematic Fatigue Crack Growth Curve ..... . . 59
6-2 Fatigue Crack Length versus Applied Cycles. Fracture is Indicated
by the x . . . . . . . . 61
6-3 Microscopic slip observed on two {111} slip planes inclined 520 and
-380 to the starter notch . . . . . 62
6-4 Details of crack tip displacements and stresses at a distance r and 0
from the crack tip in the crack coordinate system . . 64
6-5 Burgers vector b is along slip direction (011) and slip plane direc-
tion is normal vector n along (111) . . . . 65
6-6 Fatigue crack growth rate as a function of AKrs8 and AK for 2-D
rectangular specimen . . . . . . 65
6-7 Crack growth of BD specimen 95830 with no. of cycles . ... 69
6-8 Crack growth of BD specimen 96842 with no. of cycles . ... 69
6-9 Crack growth of BD specimen 98C21 with no. of cycles . ... 69
6-10 Crack growth rate of BD specimen 95830 with increasing crack length 70
6- 11 Crack growth rate of BD specimen 96842 with increasing crack length 70
6-12 Crack growth rate of BD specimen 98C21 with increasing crack length 70
6-13 Trace of primary slip planes on the plane normal to the crack plane 71
6-14 Crack growth on {111} slip plane can be observed for 96842 BD spec-
im en . . . . . . . . 73
6-15 Fatigue crack growth rate of 3 specimens 95830, 96842, 98C21, as a
function of AK ms . . . . . . 74
6-16 Fatigue crack growth rate of 3 specimens 95830, 96842, 98C21, as a
function of AKr . . . . . . . 74
A-1 Forces acting on a rectangular element with dimension dx x dy . 81