Abstract: Fully plastic solutions of J integral and Crack Opening Displacement for panels with a central short crack under the action of a uniform load are obtained by the modified energy method. The corresponding elastic-plastic solutions are also obtained by the-engineering method of elastic-plastic analysis. The comparison of the obtained results with those of infinite bodies shows that the difference is within 5% when a/b<0.05. On the other hand, in the case that a/b>05, the error may not be negligible if the sol...