Ossama Dreibati

Ossama Dreibati
Ingenieurbüro Dreibati · www.ing-ask.de

Dr.-Ing.

About

12
Publications
6,866
Reads
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23
Citations
Additional affiliations
May 2013 - December 2015
Fraunhofer Institute for Mechanics of Materials IWM
Position
  • Research Associate
January 2009 - April 2013
Brandenburg University of Technology Cottbus - Senftenberg
Position
  • Research Associate
Description
  • Physical simulation of manufacturing processes
Education
January 2009 - June 2014
October 2003 - July 2007
Technische Universität Ilmenau
Field of study
  • Mechanical Engineering
October 1992 - October 1997
‎Tishreen University
Field of study
  • Mechanical Engineering

Publications

Publications (12)
Article
Für die Bewertung der Kaltrisssicherheit in realen Bauteilen ist es insbesondere bei Anwendung von Kaltrisskriterien wichtig, für jeden Ort des Bauteils die zeitliche Entwicklung der Kaltriss-Einflussfaktoren beim Schweißen bestimmen zu können. Da dies innerhalb des Bauteils messtechnisch oft nicht möglich ist, bietet sich eine Simulation mittels n...
Conference Paper
Aufgrund der inhomogenen Erwärmung beim Schweißen entstehen Eigenspannungen und Bauteilverzug. Diese beeinträchtigen die Qualität und Funktionalität des Bauteiles und können darüber hinaus Schädigungen wie Risse hervorrufen. Die Eigenspannungen und der Verzug bedingen sich generell gegenseitig, wobei ihre Entstehung von vielen Faktoren abhängt. Neb...
Article
Full-text available
The paper presents a numerical and experimental approach for the quantification of the thermo-mechanical properties in multi-pass welds heat affected zone (HAZ) of low alloy steel S355J2+N. First, the characteristic temperature cycles for multi-pass welds were identified by FE temperature field simulations of welding. Based on the identified temper...
Article
Thermal shock behavior of ceramics plays a decisive role in their broad industrial applications. For enhanced understanding of damage and failure mechanism under thermal shock loading, in the present work, a combination of experimental testing and numerical simulation methods has been used. The thermal shock behavior of the alumina (99.7%) disk sam...
Article
Full-text available
Cold cracks in welds are the result of the formation of brittle microstructure as martensite in the presence of diffusible hydrogen as well as of tensile stresses. Cold cracks occur when the combination of cold crack influence parameters (CCIP) overcomes a critical limit. In this study, critical combinations of CCIP were identified with an enhanced...
Article
The thermomechanical properties of an AlMg0,8Si1 (corresponds to EN AW-6181) alloy in T4 state (Ecodal® 608) were investigated under coldArc® welding conditions using Gleeble 3500 concerning the numerical simulations of residual welding stresses and distortions. Thereby, tensile tests were carried out during the heating phase, cooling phase and aft...
Article
Cold cracks occur during the cooling down of welded joint at low temperatures or later at room temperature after the end of welding. It is associated with the formation of brittle microstructures as martensite in the presence of diffusible hydrogen as well as of tension stresses. By using an enhanced Simulation-und Testing Center Gleeble 3500, a pr...

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Projects

Projects (2)
Project
Implementation of a welding tool in the finite element program CalculiX The tool extends the capabilities of CalculiX The tool includes: - Calibration procedure for heat source - Definition of a weld trajectory (consists of an arbitrary group of nodes /coordinates) - Definition of a reference path to calculate the slope of the welding torch in the plane normal to the trajectory