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Crack tip opening displacement
Crack tip opening displacement (CTOD) or δ t {\displaystyle \delta _{\text{t}}} 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. The parameter is used in fracture mechanics to characterize the loading on a crack and can be related to other crack tip loading parameters such as the stress intensity factor K {\displaystyle K} and the elastic-plastic J-integral.
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