A5049665481- Fatigue and fracture mechanics
- Welding Techniques and Residual Stresses
- Surface Treatment and Residual Stress
- Structural Load-Bearing Analysis
- Advanced Welding Techniques Analysis
- Aluminum Alloy Microstructure Properties
- Aluminum Alloys Composites Properties
- Additive Manufacturing Materials and Processes
- Metal Alloys Wear and Properties
- Material Properties and Applications
- Additive Manufacturing and 3D Printing Technologies
- Advanced Fiber Laser Technologies
- Mechanical stress and fatigue analysis
- Solid State Laser Technologies
- Engineering and Materials Science Studies
- Mechanical Engineering and Vibrations Research
- Non-Destructive Testing Techniques
- Microstructure and Mechanical Properties of Steels
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Fire effects on concrete materials
- Engineering Structural Analysis Methods
- Mechanical Behavior of Composites
- Advanced Aircraft Design and Technologies
- Mechanical Failure Analysis and Simulation
Graz University of Technology
2020-2025
Montanuniversität Leoben
2014-2024
University of Augsburg
2022
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2013-2020
Christian Doppler Laboratory for Thermoelectricity
2019
Swiss Tunnelling Society
2012-2019
Universität Hamburg
2016
Jenoptik (Germany)
2005-2014
Iron and Steel Institute of Z. I. Nekrasov National Academy of Sciences of Ukraine
2013
RAG Aktiengesellschaft (Germany)
2012
The study focuses on the increase in fatigue strength welded components considering grinding as post treatment. This is examined based cruciform joints and transverse non-load-carrying attachment most relevant critical applications regard to rail vehicle structures with focus track laying machines. Firstly, starts determination of a new welding parameter for joint S960 high steel. verified by t8/5-time analysis hardening measurements weld seam. Secondly, received set compared current...
Deep rolling is a frequently used post-treatment process to increase the service life of railway axles. Through application, surface roughness reduced, work-hardened and compressive residual stresses are introduced in near region controlled manner. These three effects have positive impact on life, investigated case axles, stress state constitutes most significant potential. The surface, which responsible for lifetime effect, inevitably balanced by compensating tensile below surface....
We report phase locking of a diode-pumped multicore fiber laser with circular array 18 Nd-doped emitters (microcores) acting as an active medium. Phase was achieved in Talbot resonator configuration. present calculations the effective reflection coefficients that are due to self-imaging. Far-field distributions and near-field pattern several supermodes calculated compared experimental results.
This study shows the effect of hot isostatic pressing (HIP) on porosity and microstructure, as well corresponding fatigue strength selectively-laser-melted (SLM) AlSi10Mg structures. To eliminate influence as-built surface, all specimens are machined exhibit a polished surface. highlight HIP treatment, compared to test series without any post-treatment. The characteristic is evaluated by tension-compression high cycle tests under load stress ratio R = −1. microstructural characteristics...
This paper focusses on the effect of hot isostatic pressing (HIP) and a solution annealing post treatment fatigue strength selectively laser melted (SLM) AlSi10Mg structures. The aim this work is to assess unprocessed (as-built) surface residual stresses, regarding behaviour for each condition. roughness specimens evaluated based digital light optical microscopy subsequent three-dimensional image processing. To holistically characterize contributing factors strength, axial stress all with...
Abstract Among various post-weld treatment techniques, the high-frequency mechanical impact (HFMI) is a robust technique to introduce an enhancement in fatigue strength of welded high-strength steel joints. In engineering applications, however, structures usually undergo fluctuating cyclic load conditions resulting variable amplitude (VAL) conditions. The objective this work validate use local notch stress approaches assess as-welded (AW) and HFMI-treated joints made ultra-high-strength...
This paper deals with a crack propagation analysis of welded structures and rehabilitation after pre-fatigue loading by the high-frequency mechanical impact (HFMI) post-treatment technique. The investigated specimen type is thin-walled longitudinal stiffener made mild steel S355. Fracture calculations are primarily performed on basis weight-function approach. Thereby, local residual stress condition at weld toe considered aid structural simulation, whereas numerically evaluated distribution...
The objective of this research work is to scientifically contribute the fatigue strength assessment selectively laser melted metallic structures and aims derive a methodology safely estimate bulk material based on experimental data. Investigations focus determination relevant post build -processing residual stress condition implementation in state art design concepts, alongside defect population properties. Additive manufacturing, especially powder-bed melting, exposes immense thermal...
Abstract This fundamental research presents an investigation of Wire Arc Additive Manufacturing (WAAM) process on distortion and residual stress using numerical simulation. Further, WAAM geometry was modeled simplified rectangular bead shape with five layers three strings. The thermo-mechanical simulation is conducted under consideration non-linear isotropic hardening by general purposed FEM software MSC Marc/Mentat. In this simulation, different heat source models (Goldak’s double-ellipsoid...