A5084117949- Numerical methods in engineering
- Mechanical Behavior of Composites
- Composite Material Mechanics
- Laser Material Processing Techniques
- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- Estrogen and related hormone effects
- Manufacturing Process and Optimization
- Advanced Fiber Laser Technologies
- Advanced Numerical Analysis Techniques
- High Entropy Alloys Studies
- Welding Techniques and Residual Stresses
- Fatigue and fracture mechanics
- Solid State Laser Technologies
- Nonlinear Optical Materials Research
- Innovations in Concrete and Construction Materials
- High Temperature Alloys and Creep
- Electromagnetic Scattering and Analysis
- Cellular and Composite Structures
- Material Properties and Applications
- Photonic and Optical Devices
- Synthesis and properties of polymers
- Advanced machining processes and optimization
- Menopause: Health Impacts and Treatments
- Composite Structure Analysis and Optimization
Friedrich-Alexander-Universität Erlangen-Nürnberg
2019-2025
Technische Universität Braunschweig
1998-2020
TU Dresden
2011-2019
ESI Group (France)
2009-2019
Institut für Solarenergieforschung
2019
RWTH Aachen University
2017
Universität Hamburg
2012-2013
Institute of Solid Mechanics
2013
Humboldt-Universität zu Berlin
2005
Institut de Recherche de Chimie Paris
1992-1993
The initial investigation evaluates the feasibility of ultra high performance concrete (UHPC) as a material for reusable molds in aluminum casting. Two specific UHPC formulations were investigated: one based on ordinary Portland cement (OPC) and another utilizing alkali-activated materials (AAM). study focused investigating surface through roughness measurements thermal durability repeated casting cycles. stability was investigated by thermogravimetric analysis, mercury intrusion...
Waveguides were fabricated in a 5 mm long Pr(0.5 at%):LiYF4 (YLF) crystal with femtosecond Ti:sapphire laser system. Waveguiding was achieved inside core surrounded by eight single modified tracks building rhombic structure. The waveguide pumped at wavelength of 444 nm an InGaN diode. Orange and deep red oscillation realized. Maximum output powers 25 mW 604 12 720 respect to the incident pump power achieved.
Laser surgery provides clean, fast and accurate cutting of tissue. However, it is difficult to detect what kind tissue being cut. Therefore, a wrong cut may lead iatrogenic damage structures. A feedback system should automatically stop the process when nerve reached or accidentally prevent its damage. This could increase applicability safety using laser scalpel in surgical procedures. In this study, random lasing (RL) used differentiate between skin, fat, muscle Among these types, special...
Femto-second laser writing was used to fabricate waveguides in a z-cut KTP sample with losses below 0.8 dB/cm. They were for efficient, broad bandwidth, Type II birefringent second harmonic generation the green. The temperature and wavelength bandwidth were, 28 C ∙ cm 0.85 nm cm, respectively.
SUMMARY In this article, we present the application of bilinear and biquadratic extended FEM (XFEM) formulations to model weak discontinuities in magnetic coupled magneto‐mechanical boundary value problems. For properly resolving location curved interfaces discontinuous physical behaviour, major part contribution is devoted review develop methods for level set representation numerical integration form higher‐order XFEM formulations. order reduce complexity interfaces, an element local...
Due to porosity and incomplete fusion, aluminium high pressure die castings are materials that known be difficult weld. Hereby is mainly caused by hydrogen which trapped within the weld bead during solidification as a result of insufficient degassing. To enhance degassing reduce influence surrounding air, laser vacuum welding was applied current study. The main goal investigate occurrence beam castings. reach this aim, casting plates were welded at varied ambient investigated x-ray computed...
This paper addresses the multi‐scale simulation of heterogeneous materials with a special emphasis on modeling internal discontinuities. In homogenization context local material structure is discretized by extended finite element method which uses an enriched displacement approximation in combination cohesive zone model. approach applied to predict effective behavior fiber reinforced polymer and then used investigate interaction fiber‐matrix interface adhesive layer. All simulations are...
A very effective method to bond an electronic device a substrate is the pressure assisted sintering of sub-micron silver paste at temperatures between 150°C and 300°C. This technique-sometimes called “Silver-Sintering” or “Low Temperature Joining Technique (LTJT)” already used in many power electronics industry applications. It provides die attach layers with excellent pull-strength more than 100 MPa room temperature 30 Additionally electrical thermal conductivity nearly as good it pure...
Bone protection and metabolism are directly linked to estrogen levels, but exercise is also considered have bone protective effects. Reduced levels lead a variety of disorders, for example, loss reduced movement drive. The objective this study was investigate the effects on individual voluntary motivation protection. We investigated sham operated, ovariectomized, ovariectomized with supplemented Wistar rats (20 weeks old) either or without access wheels. selected an experimental approach...
During the manufacture of aluminum high pressure die castings, alloy is in a liquid phase during majority process steps. Due to solubility hydrogen aluminum, casted part likely has an increased content, which affects weldability negatively. When welding these materials, hydrides dissociate and liberated forms porosity solidification. To avoid described formation porosity, friction stir below melting point electron beam with frequency oscillation were investigated prior research. Other...
This paper addresses the multiscale simulation of heterogeneous materials. The considered composite materials exhibit a hierarchical material structure with three distinct length scales - micro, meso and macro. feature morphology allows for application homogenisation techniques based on representative volume element (RVE) which is entirely typical local, periodic structure.The in an RVE modelled by extended finite method (XFEM) Suitable models account deformation behaviour constituents...
High-pressure die casting dies are produced in most cases by conventional subtractive manufacturing processes. In this case, a massive design of the usually ensures high stability during process. However, at same time, it leads to low flexibility production and material costs. The basic approach present work is reduce process favor flexible, modular design, where only few contour elements have be replaced for achieving different castings. order pave way principle, thermal structural...
Creep crack growth data of Inconel 706-MST between 600°C and 700°C are presented i n order to assess the materials suitability for ultra high temperature steam turbine applicat~ons.Hereby, "MST" stands a heat treatment modification proposed earlier by authors.It is demonstrated that creep resistance can be raised level more ductile such as Waspaloy 617 benefit relative conventional cycles particularly pronounced at 700°C.The results interpreted in terms precipitation sequence during thermal exposure.
Osteoporosis is predominantly treated with drugs that inhibit further bone resorption due to estrogen deficiency. Yet, osteoporosis not only but also stimulate formation, such as potentially inhibitors of 17β-hydroxysteroid dehydrogenase type 2 (17β-HSD2), may be more efficacious in the treatment osteoporosis. Blockade 17β-HSD2 thought increase intracellular estradiol and testosterone bone, thereby inhibiting by osteoclasts stimulating formation osteoblasts, respectively. We here describe...