Search results for "material flow"
showing 6 items of 36 documents
On the Field Variables Influence on Bonding Phenomena during FSW Processes: Experimental and Numerical Study
2013
Solid state bonding recurs in several manufacturing processes, as Friction Stir Welding (FSW), Linear Friction Welding (LFW), extrusion of hollow profiles and Accumulative Roll Bonding (ARB). The former processes are nowadays of particular industrial interest because of the specific advantages with respect to the classic welding technologies. In FSW the solid state bonding is obtained between an undeformed cold material, already placed in the advancing side of the joint, and the hot material flow incoming from the retreating side. Proper conditions of pressure, temperature, strain and strain rate are needed in order to get the final effective bonding. In the paper experimental tests on butt…
Influence of geometrical ratios in forgeability of complex shapes during hot forging of Ti-6Al-4V titanium alloy
2014
Abstract Titanium alloys are considered desirable materials when both mechanical properties and weight reduction are requested at the same time. This class of materials is widely used in application fields, like aeronautical, in which common steels and light-weight materials, like aluminum alloys, are not able to satisfy all operative service conditions. Most of manufacturing processes of titanium alloy components are based on machining operations, which allow obtaining very accurate final shapes but, at the same time, are affected by several disadvantage like material waste and general production costs. During the last decade, the forging processes for titanium alloys have attracted greate…
DOMESTIC MATERIAL CONSUMPTION INDICATOR AND NATURAL RESOURCES: A EUROPEAN ANALYSIS OF THE ENVIRONMENTAL KUZNETS CURVE
2014
The study investigates the relation between per capita Domestic Material Consumption indicator (DMC) and per capita income. Economic literature focuses mainly on air, water and land pollution while we consider as environmental degradation the consumption on natural resources extracted from the environment. Using a cross– European panel of countries over the period 2000-2011, our results confirm the absence of an Environmental Kuznets Curve (EKC) between per capita DMC and per capita GDP both for EU-27 vs. 30 European countries and for Western vs. Eastern European countries. The turning points are so high that it is present a monotonic increasing relation between DMC indicator and GDP.
Experimental and Numerical Study on Linear Friction Welding of AA2011 Aluminum Alloy
2014
Linear Friction Welding (LFW) is a solid-state joining process used for non-axisymmetric components. LFW involves joining of materials through the relative motion of two components undergoing an axial force. In the process, the heat source is given by the frictional forces work decaying into heat and determining a local softening of the material and eventually the needed bonding conditions. In the paper, an experimental and numerical campaign is proposed for AA2011 aluminum alloys welding. Different case studies are considered with fixed oscillation frequency and varying pressure at the interface between the specimens. Constant oscillation amplitude and specimens geometry is used. The calcu…
Friction Based Solid State Welding Processes
2012
In the last decade the industrial use of solid state welding processes based on frictional forces work decaying into heat is continuously increasing due to their strong advantages with respect to traditional fusion techniques. Several advances have been proposed by the scientific community regarding process mechanics, material flow and also the computer aided engineering of the operation with the aim to maximize the mechanical performances of the welded joints. In the paper Friction Stir Welding (FSW) and Linear Friction Welding (LFW) operations are considered and a review of the most relevant research issues and results is provided.
Material flow analysis in dissimilar friction stir welding of AA2024 and Ti6Al4V butt joints
2016
The complex material flow occurring during the weld of dissimilar AA2024 to Ti6Al4V butt and lap joints was highlighted through a dedicated numerical model able to take into account the effects of the different materials as well as the phase transformation of the used titanium alloy.