Abstract

In order to obtain the crack growth resistance curve, a typical fracture test must measure the load vs. crack extension (F-Δa) curve. Apart from the basic measurement of the load vs. load-line displacement (F-vLL) curve, additional instruments or tedious test operations such as partial unloading are necessary to measure the amount of crack extension. This paper proposed a novel method of calculating the F-Δa curve directly from the F-vLL curve, in which no additional instrument or test operations are required. The proposed method can be easily applicable to these non-standard specimens. Several examples of C(T) and M(T) specimens are adopted to verify this method. Thus, this method is expected to simplify these available standards for measuring crack length.

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