Author(s)

C. C. Chamis & P. L. N. Murthy

Abstract

Anisotropic composite plates were evaluated with nanofiber reinforced matrices (NFRM). The nanofiber reinforcement volumes ratio in the matrix was 0.01. The plate dimensions were 20 by 10 by 1.0 in. (508 by 254 by 25.4 mm). Seven different loading condition cases were evaluated: three for uniaxial loading, three for pairs of combined loading, and one with three combined loadings. The anisotropy arose from the unidirectional plates having been at 30° from the structural axis. The anisotropy had a full 6 by 6 rigidities matrix which were satisfied and solved by a Galerkin buckling algorithm. The buckling results showed that the NFRM plates buckled at about twice those with conventional matrix. Keywords: combined vibration frequencies, buckling influence, plate vibration at different or orientation angles, comparisons with conventional matrix. 1 Introduction Considerable research activities in nanocomposites have been actively pursued recently. One aspect of this research is on nanofiber reinforced matrices (NFRM) which can subsequently be used as matrices in conventional reinforced fiber composites [1–3]. Reference [1] includes pertinent references to that date. Reference [3] includes additional references to 2009. However, to date, the vibration of composite plates with NFRM has not been investigated yet. This is the objective of the present paper, to use commercial composites with NFRM loaded at 30° from the material axis (Fig. 1) for seven different load cases shown in Table 6 for uniaxial and combined load conditions.

Keywords

combined vibration frequencies, buckling influence, plate vibration at different or orientation angles, comparisons with conventional matrix.