Abstract
Abstract A test method is described for measuring plane strain crack arrest toughness KIa with a compact shaped specimen. The method has a number of advantages over those previously used. Rather than a fatigue crack for initiation, a machine-notched, brittle weld is used, which reduces testing costs. A very stiff loading system consisting of a wedge and bushing assembly allows for much higher ratios of initiation to arrest toughness than those allowed with pin-loaded double-cantilever specimens. The use of large initiation values is expected to allow for larger KIa measurements with modest-sized specimens.
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