Development of structural analysis program for non-linear elasticity by continuum damage mechanics

The brittle damage constitutive equation developed by Chow and Yang is used to simulate the non-linear elastic deformation behavior of graphite using finite element method (FEM). This model is achieved by introducing a damage surface that is similar to the yield function in the conventional theory of plasticity. A special form of damage surfaces is constructed to illustrate the application of the model. For verifying the FEM program including the Chow and Yang model, the predicted deformations by this model are compared with both the experimental ones in the graphite structural model and the calculated ones without the continuum damage mechanics.