Abstract
The ASTM standard method for the measurement of fracture toughness, E 1820 [1], covers procedures and guidelines for the determination of this material property in metallic materials using the parameters K, J or CTOD. The fracture toughness may be measured as a point value, or as a complete fracture toughness resistance curve. In the latter option a J- or CTOD-based resistance curve may be obtained from a single specimen fracture test, in which the crack length is measured from compliance changes, and later verified by optical measurements. The single specimen J-R curve construction procedure defined in E1820 involves several steps, which go from obtaining and plotting the raw J-Δa data, to calculating an interim value of J, termed J Q, to finally qualifying J Q as J Ic, a size-independent value of fracture toughness.
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