Showing papers in "Physics Procedia in 2010"

TL;DR: In this article, the results of two different wire-based additive-layer manufacturing systems are compared: in one system Ti-6Al4V is deposited by a Nd:YAG laser beam, in the other by an arc beam (tungsten inert gas process).

TL;DR: In this paper, the effects of the processing parameters such as laser power, scanning speed and powder layer thickness on the single tracks formation are analyzed and it is shown that by choosing an optimal technological window and appropriate strategy of SLM, it is possible to manufacture highly complex parts with mechanical properties comparable to those of wrought material.

TL;DR: In this article, the authors describe which tools are and will be available to fulfil those requirements from the perspective of a laser machine manufacturer and set the focus on melt pool analysis and control.

TL;DR: In this paper, a monitoring and control system is presented which enables monitoring the melt pool continously at high speed throughout the building process, in this way enabling feedback control of the process parameters.

TL;DR: In this article, an additive manufacturing technique (AM) for ceramics, based on Al2O3-ZrO2 powder by means of Selective Laser Melting (SLM), is presented.

TL;DR: The behavior and effect of a plasma plume on the weld penetration are greatly different between CO2 laser welding and YAG, disk or fiber laser welding as discussed by the authors, and the effects of the power and the power density on the welding penetration are elucidated.

TL;DR: In this paper, the temperature distribution in the laser/powder interaction zone and the shape of the melt pool are numerically calculated by a model of coupled radiation and heat transfer applicable to single vectors.

TL;DR: In this article, the suitability and processing behavior by means of melting and (isothermal) crystallization are studied, and a method for the qualification of new materials is presented, based on this method processing parameters for new thermoplastics can systematically be found.

TL;DR: In this paper, the authors present a review of the research needs for energy and sustainability as applied to additive manufacturing based on the 2009 Roadmap for Additive Manufacturing Workshop and an energy assessment for selective laser sintering of polymers.

TL;DR: Diagrammatic Monte Carlo (DiagMC) is a numeric technique that allows one to calculate quantities specified in terms of diagrammatic expansions, the latter being a standard tool of many-body quantum statistics as discussed by the authors.

TL;DR: In this paper, an optical system for temperature monitoring of selective laser sintering/melting (SLS/SLM) processes is developed and integrated with industrial SLM machines, which provides the possibility to spatial distribution of brightness temperature at two wavelengths and selected temperature profiles.

TL;DR: Realizer as discussed by the authors is a desktop machine for additive manufacturing of metal parts by Selective Laser Melting (SLM) which has become a powerful tool for direct manufacturing of complex parts mainly for the aerospace and medical industry.

TL;DR: A review of recent developments in ultrasonic processing to show the present situation and the prospective progresses of high-power ultrasonics as an innovative technology in many industrial sectors is presented in this paper.

TL;DR: In this paper, the authors proposed a laser-cut process for carbon fiber reinforced plastic (CFRP) parts by reducing the heat affected zone at cutting edge and influence on part quality.

TL;DR: In this paper, temperature monitoring of the Selective Laser Melting in the laser impact zone is carried out by an originally developed bi-colour pyrometer which is integrated with the optical scanning system of the PHENIX PM-100 machine.

TL;DR: In this paper, Fraunhofer IPT has developed a novel process concept for laser-assisted milling with local laser-induced material plastification before cutting, aiming at the reduction of process forces, increased material removal rates and longer tool service life without application of cooling lubricants.

TL;DR: In this paper, the influence of power ultrasound on convective drying of natural materials addressing the kinetic as well as the product's microstructure was discussed. But, the authors did not consider the effects on mass transfer properties from microestructural observations.

TL;DR: In this article, an overview of the numerical simulation model for laser material processing is given, and an outlook on planned further developments is given and possible applications of the model are discussed.

TL;DR: In this paper, the authors present an introductory survey of the basic concepts of these new technologies with particular emphasis on their main applications, together with a description of some modelling approaches, and present an overview of the main applications of these technologies.

TL;DR: A generalized, “big picture” overview indicating “lessons learned” and where future emphasis should be focused on laser influences and state-of-the-art knowledge is presented.

TL;DR: In this article, a review of the basic principles of fluid mechanics needed for development of linear and non-linear ultrasonic concepts is given, and the fundamental equations of nonlinear ultrasonics are derived and their physical properties explained.

TL;DR: Magnetically responsive nanocomposite materials, prepared by modification of diamagnetic materials by magnetic fluids (ferrofluids), have already found many important applications in various areas of biosciences, medicine, biotechnology, environmental technology etc as discussed by the authors.

TL;DR: In this paper, the developments in remote laser material processing with highly brilliant laser beam sources are reviewed and the impact of the remote technologies on the industrial production is discussed, as well as current research topics and application areas.

TL;DR: This paper proposes to employ a simple L-C matching network with only one inductor and one capacitor for high impedance ultrasonic transducers, and this topology is evaluated by means of equivalent circuit analysis, computer simulation, and experimental assessment.

TL;DR: In this paper, microstructural changes occur in ferritic and duplex stainless steels when heat input is controlled by welding parameters, and they were identified and examined using optical metallographic methods.

TL;DR: In this article, a drilling process with different degrees of wear in the drill bit was studied to find relationships between acoustic emission (AE) and torque measured during the drilling process, and also with the degree of wear of the tool.

TL;DR: In this article, the influence of the laser treatment process on the properties of electrospark coatings was determined by microstructure analysis, microhardness, roughness and adhesion tests.

TL;DR: In this paper, the separation of micron-sized particles from a steady flow of water through the use of ultrasonic standing waves is discussed, where an ultrasonic resonator is designed with a flow inlet and outlet for the water stream.

TL;DR: In this article, a laser method for separating the strengthened glass and the effect of this process on edge quality and strength are reported. But the laser-based cutting technique enables clean full separation of the strong glass sheets without spontaneous cracking or shattering.

TL;DR: In this paper, a log-periodic power law (LPPL) model has been developed as a flexible tool to detect bubbles by combining the economic theory of rational expectation bubbles, behavioral finance on imitation and herding of investors and traders and mathematical and statistical physics of bifurcations and phase transitions.