Abstract
A method for determining steady state crack resistance ( R p) using a single specimen is discussed. An expression for crack resistance R is derived as a function of crack growth c in terms of the essential energy U e which is the sum of the blunting energy and the integration of the crack resistance with respect to the cracking area. The essential energy U e is then related to the area between the loading and unloading curves. Energy values determined in this way are found to be meaningful for steady state crack growth, and as a result the derived equation is useful for calculating R p values. This method is demonstrated for two samples of modified PMMA with different initial crack lengths. R p is calculated for each sample and compared with a value obtained from multiple specimen testing of the same material.
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