GT Lab Delta Pic

Summary

An open composite shell constructed by planar filament winding was analyzed using membrane theory and finite elements. Solutions for the fiber direction stress and radial displacements were presented for three different types of shells: ellipsoid, spheroid, and netting shell. The membrane theory results were compared to nonlinear finite element performed using 4-noded axisymmetric elements. The membrane solution assumes that the transverse and shear direction can carry stress loads which may not be true with actual composites because of their low strength in those directions. The membrane solution for fiber direction under-predicts the stresses and over-predicts the deformation in all three shells. The fiber stresses in all three shells are similar, but the transverse and shear stress vary considerably. The netting shell gave the lowest transverse and shear stress, whereas the other two shells gave high stress which exceed the allowable stress.


© 1997 Kurt Gramoll, The University of Oklahoma, All Rights Reserved.