Abstract
Against the background of recent eta factor developments, the plane stress tensile loading of a centre cracked panel is investigated, the objective being the determination J DP , the plastic component of the deformation J integral. A frequently used J DP expression involves the energy and complementary energy integrals, and is based on the assumption that the crack size is large in relation to the panel width. The extent to which this expression gives inaccurate J DP estimates, when it is applied to the behaviour of a short crack, is demonstrated. An alternative J DP representation, valid for all crack sizes, is presented, the eta factors involved in this representation being determined by ensuring that the J DP description is exact at the two extreme levels of deformation: small-scale yielding and extensive deformation at limit load conditions.
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