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Transformation of Delta5 to DeltaBS and J

CTOD Delta5 is a displacement of points located 2.5 mm above and below crack tip at the specimen surface.

Java applet below transforms CTOD Delta5 to CTOD DeltaBS and J-integral for CT and 3PB specimens (B/W = 0.5, a/W = 0.55).

Select specimen type, per cent of side grooves, crack curvature Alpha and hardening power n. Specify elasticity modulus E (MPa) and yield stress Sy (MPa).

Then specify Delta5 (mm) and press ENTER. Each time you do this you have a line with three numbers: Delta5 (mm), DeltaBS (mm) and J/(2Sy) (mm).

Details to this procedure are here