Further results in J and CTOD estimation procedures for SE(T) fracture specimens – Part II: Weld centerline cracks

This work examines the effect of weld strength mismatch on J and CTOD fracture parameters using single edge notch tension (SE(T)) specimens. A central objective of the study is to enlarge on previous J and CTOD estimation procedures based upon plastic eta factors (η) described in Part I for centerline-cracked welds. The present analyses provide a large set of η-factors for a wide range of crack sizes (a/W-ratio) and material properties, including different levels of weld strength mismatch, which are applicable in improved estimation equations for J and CTOD for weld centerline notched SE(T) specimens.

► Large set of eta-factors applicable to pin-loaded and clamped SE(T) specimens including effects of weld strength mismatch.
► 3-D effects on the developed eta-factors are not significant.
► Strength mismatch in the range 20% overmatch has a weak effect on the developed eta-factors.
► Very shallow crack specimens should not be used in fracture testing.