WRINKLING CRITERION FOR AN ANISOTROPIC SHELL WITH COMPOUND CURVATURES IN SHEET FORMING

被引:62
作者
WANG, CT [1 ]
KINZEL, G [1 ]
ALTAN, T [1 ]
机构
[1] OHIO STATE UNIV,ENGN RES CTR NET SHAPE MFG,COLUMBUS,OH 43210
关键词
D O I
10.1016/0020-7403(94)90056-6
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Wrinkling criteria are proposed for an elastic isotropic and plastic anisotropic shell with compound curvatures in the noncontact region of a sheet subjected to internal forming stresses. A quasi-shallow shell is modeled by Donnell-Mushtari-Vlasov (DMV) shell theory. A bifurcation functional from Hill's general theory of uniqueness and bifurcation in elastic-plastic solids is used to model the local wrinkling phenomenon. Both strain hardening and transverse anisotropy are taken into consideration. This wrinkling criterion is especially useful as a failure criterion in three dimensional finite element modeling (FEM) of sheet forming. Given the principal stresses or strains and the geometry provided at each incremental deformation step, the criterion can be used to predict wrinkles in the elements in the unsupported region.
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页码:945 / 960
页数:16
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