Modelling and Simulation of Metal Deposition on a Ti-6al-4v PlateReport as inadecuate




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Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-0053-5537Pederson, Robert Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.Hörnqvist, Magnus GKN Aerospace Engine Systems.Brice, Craig NASA Langley Research Center, Hampton.Steuwer, Axel MAX-lab, Lund University.Heralic, Almir GKN Aerospace Engine Systems Sweden.Buslaps, Thomas ID15A, European Synchrotron Radiation Facility ESRF, 38042 Grenoble.Lindgren, Lars-Erik Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.Show others and affiliations 2015 (English)Conference paper, Presentation (Other academic)

Abstract [en] : There are many challenges in producing aerospace components by metal deposition (MD). One of them is to keep the residual stresses and deformations to a minimum. Anotherone is to achieve the desired material properties in the final component. A computer model can be of great assistance when trying to reduce the negative effects of the manufacturing process. In this work a finite element model is used to predict the thermo-mechanical response during the MD-process. This work features a pysically based plasticity model coupled with a microstructure evolution model for the titanium alloy Ti-6Al-4V. A thermally driven microstructure model is used to derive the evolution of the non-equilibrium compositions of α-phases and β-phase. Addition of material is done by activation of elements. The method is taking large deformations into consideration and adjusts the shape and position of the activated elements. This is particularilly important when adding material onto thin and flexible structures. The FE-model can be used to evaluate the effect of different welding sequenses. Validation of the model is performed by comparing measured deformations, strains, residual stresses and temperatures with the computed result. The deformations, strains and temepratures are measured during the process. The deformations are measured with a LVDT-gauge at one location. The strains are measured with a strain gauge at the same location as the deformations. The temperature is measured at five locations, close to the weld and with an increasing distance of one millimeter between each thermo couple. The residual stresses in MD component were measured non-destructively using high-energy synchrotron X-ray diffraction on beam line ID15A at the ESRF, Grenoble.

Place, publisher, year, edition, pages: 2015.

National Category : Other Materials Engineering

Research subject: Material Mechanics; Engineering Materials

Identifiers: URN: urn:nbn:se:ltu:diva-31025Local ID: 5109fb86-6304-481a-8d1c-a73f6794e237OAI: oai:DiVA.org:ltu-31025DiVA: diva2:1004254

Conference: National Congress on Computational Mechanics : 26/07/2015 - 30/07/2015

Note: Godkänd; 2015; 20160510 (andlun)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-06-29Bibliographically approved



Author: Lundbäck, Andreas

Source: http://ltu.diva-portal.org/







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