A STUDY OF SCALE EFFECT OF COMPOSITE LAMINATED PLATES BASED ON NEW MODIFIED COUPLE STRESS THEORY BY FINITE-ELEMENT METHOD

摘要

Models of composite laminated plates based on new modified couple stress theory have been developed by authors; however, the investigation of the scale effect is limited to a simply supported rectangular plate subjected to bending loads of f_ω = go sin(πx/a) sin(πy/a). In this paper, a novel plate element based on new modified couple stress theory is presented to extend the study of the scale effects for more complex boundary conditions and load cases on various composite laminated plates such as the Reddy plate, the Mindlin plate, and the Kirchhoff plate. The present element is a refined triangular element in which the C~1weak-continuity condition and C~0 continuity condition can be satisfied simultaneously. The numerical results show that the present element can capture the scale effects of microstructure with far more complex boundary conditions. Note that in the case of a simply supported rectangular plate the numerical results of the present element can coincide with analytical results in the existing literature.