Ultrasonic Sensing of Porous Granular Media

Emerging high temperature materials such as intermetallic alloys and composites are intrinsically brittle and cannot be either processed or machined by conventional methods. Near net shape processing (of rapidly solidified powders and plasma sprayed foils) using hot isostatic or vacuum hot pressing has recently emerged as a promising method for overcoming these problems. Interestingly, these consolidation processes determine both the component’s final shape and its mechanical properties (which depend on relative density, grain size, etc.). Thus a need has emerged for the control of mechanical properties (1,2)

Advances in anisotropy of plastic behaviour and formability of sheet metals

This paper reviews the most recent models for description of the anisotropic plastic behavior and formability of sheet metals. After a brief review of classic isotropic yield functions, recent advanced anisotropic criteria for polycrystalline materials of various crystal structures and their applications to cup drawing are presented. Next, the discussion focuses on novel formulations of anisotropic hardening. A brief review of the experimental methods used for characterizing and modeling the anisotropic plastic behavior of metallic sheets and tubes under biaxial loading is presented. The experimental methods and theoretical models used for measuring and predicting the limit strains, development of new tests for determining the Forming Limit Curves (FLC), as well as on studying the influence of various material or process parameters on the limit strains are presented.11Nsciescopu