Effect of planar anisotropy on wrinkle formation tendencies in curved sheets

Wrinkle formation tendencies in the form of short-wavelength shallow buckli ng modes are investigated for sheet materials exhibiting planar anisotropy. The critical state for the onset of these short-wave length shallow modes are determined from plastic bifurcation theory. A local analysis is perform ed by considering the current deformed state of a sheet element in a doubly -curved, biaxial plane stress state. The planar anisotropy is prescribed us ing recently proposed anisotropic yield criteria. Parametric studies are pe rformed to assess the effects of the various material and geometric paramet ers on wrinkling. (C) 2001 Elsevier Science Ltd. All rights reserved.