- The nonlinear behavior of continuous-fiber-reinforced metal-matrix composite structures is examined using a micromechanical constitutive theory. Effective lamina constitutive relations based on the Aboudi micromechanics theory are presented. The inelastic matrix behavior is modeled by the unified viscoplasticity theory of Bodner and Partom. Debonding between fiber and matrix phases is also considered. In Part II of this paper, the laminate constitutive relations are incorporated into a first-order shear deformation plate theory. The resulting boundary value problem is solved by the finite element method. 1991.