What is CTOD in fracture mechanics?
Crack tip opening displacement (CTOD) or is the distance between the opposite faces of a crack tip at the 90° intercept position. The position behind the crack tip at which the distance is measured is arbitrary but commonly used is the point where two 45° lines, starting at the crack tip, intersect the crack faces.
How is CTOD calculated?
δBS is calculated by the following formula:(1) δ BS = δ el + δ pl = K 2 ( 1 - ν 2 ) 2 E σ ys + 0.4 ( W - a 0 ) 0.4 ( W - a 0 ) + a 0 V p In the above equation, K is the stress intensity factor for the critical load. After BSI unified the KIc, CTOD and Jc toughness test procedures in BS 7448 Part 1, use of Eq.
