P. Hartley

TL;DR: In this paper, the use of the finite element technique was used to predict fracture initiation in a range of simple metalforming operations, including simple upsetting, axisymmetric extrusion, and strip compression and tension.

TL;DR: In this paper, a method for introducing friction into the finite-element analysis is described, which is achieved by the inclusion of a layer of elements whose stiffness is modified by a function of the interfacial shear factor.

TL;DR: In this article, the axial compression of solid cylinders with initially equal height and diameter between flat parallel platens is examined, and a finite-element method is used to predict the platen forces, the pressure distribution, and the strain and hardness distributions within the billet, for various levels of interface shear stress.

TL;DR: In this paper, the authors used axisymmetric rim-disc forging to predict the internal hardness distribution and excessive local grain growth of a billet and compared the results with a cold-forged aluminium product and an industrially produced aluminiumalloy extrusion.

TL;DR: In this article, a preliminary axi-symmetric upper bound analysis is presented, but the simple models used are shown to be insufficient to represent accurately the complex phenomena observed and it is suggested that finite-element elastic-plastic analysis may be more appropriate.