In this note we analyze the influence of four damage models on the
collapse load of a structure. The models considered here have
been developed using the hypothesis based on the concept of effective
stress and the principle of strain equivalence and they were
proposed by Lemaitre and Chaboche (1990, Mechanics of Solid
Materials), Wang (1992, “Unified CDM Model and Local Criterion
for Ductile Fracture—I. Unified CDM Model for Ductile
Fracture,” Eng. Fract. Mech., 42, pp. 177–183), Chandrakanth
and Pandey (1995, “An Isotropic Damage Model for Ductile Material,”
Eng. Fract. Mech., 50, pp. 457–465), and Bonora (1997,
“A Nonlinear CDM Model for Ductile Failure,” Eng. Fract.
Mech., 58, pp. 11–28). The differences between them consist
mainly in the form of the dissipative potential from which the
kinetic law of damage is derived and also in the assumptions
made about some parameters of the material.
