The D Criterion Theory In Notched Composite Materials

This paper proposes a new D criterion theory which includes a new physical quantity —the damage parameter, D, a new material property—the ultimate damage, D c and a new criterion—D ≤ D c . A number of experimental data are used to verify that the damage parameter, D, describes the degree of the damage near the notch after a certain applied load and that the ultimate damage, D c , is a material constant independent of configuration of the specimen and the applied load.