Edmund Chu

TL;DR: In this paper, a method for predicting side wall curls in the two-dimensional draw bending operation using moment-curvature relationships derived for sheets undergoing plane strain stretching, bending and unbending deformations is presented.

TL;DR: In this article, the authors used moment-curvature relationships to predict side-wall curls in 2D draw bending operations, using a membrane finite-element solution to calculate spring-back.

TL;DR: In this paper, the effect of plastic deformation on the geometric instability in tube hydroforming, such as global buckling, axisymmetric wrinkling, and asymmetric wrinkles, is precisely treated by using the exact plane stress moduli tensor.

TL;DR: In this article, a theoretical Process Window Diagram (PWD) is proposed and established for free-expansion tube hydroforming with both combined internal pressure and end feeding, and an optimal loading path is also proposed in the PWD with an attempt to define the ideal forming process.

TL;DR: In this article, the onset of flange wrinkling of a deep drawing cup is analyzed as an elastoplastic bifurcation problem and a closed-form solution for the critical drawing stress is developed based on an assumed nonlinear plastic stress field and the deformation theory of plasticity.