Abstract Metal forming of shape memory alloys (SMA) can be challenging since these are very often brittle due to their intermetallic character. However, formability is needed not only for realising the desired geometry but also tailoring microstructure and functional properties. To investigate whether encapsulation in a steel shell improve alloys, Co 49 Ni 21 Ga 30 49.5 Fe 14.5 Mn 4.0 26.0 6.0 ...

The polyhedral building blocks of the layered inorganic network in the mixed-valence title compound, (NH4)(V(IV)O2)(V(V)O2)(TeO3), are vertex-sharing V(V)O4 tetra-hedra, distorted V(IV)O6 octa-hedra and TeO3 pyramids, which are linked by V-O-V and V-O-Te bonds, forming double layers lying parallel to (100). The presumed Te(IV) lone-pairs of electrons appear to be directed inwards into cavities ...

For ̄ exible manufacture of a doubly curved sheet metal, a new sheet metal forming process is proposed that uses a movable punch set composed of two pairs of lower support punches and one upper centre punch. The process is characterized by ̄ exibility compared with the existing conventional processes because it does not require any complex-shaped die and the loss of material is minimized by unc...

Single point incremental forming is used for rapid prototyping of sheet metal parts. This forming technology was applied to the fabrication of thin shell micropyramids of aluminum, stainless steel, and titanium foils. A single point tool used had a tip radius of 0.1 mm or 0.01 mm. An ultrasonic spindle with axial vibration was implemented for improving the shape accuracy of micropyramids formed...

The aim of this work is to investigate and predict ductile failure in forming processes. Experimental results deep drawing corrugation processing on aluminum alloys suggest that some cases can be due shear-dominated loadings. In order simulate numerically during forming, we use the micromechanical Madou–Leblond model, which permits account for void shape effects are important under shear case d...