A5050273596- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Microstructure and mechanical properties
- Advanced Surface Polishing Techniques
- Metal and Thin Film Mechanics
- Microstructure and Mechanical Properties of Steels
- Fatigue and fracture mechanics
- Advanced materials and composites
- High Temperature Alloys and Creep
- Engineering Technology and Methodologies
- Force Microscopy Techniques and Applications
- Aluminum Alloys Composites Properties
- Advanced machining processes and optimization
- High-Velocity Impact and Material Behavior
- Surface Treatment and Residual Stress
- Advanced Welding Techniques Analysis
- Granular flow and fluidized beds
- Additive Manufacturing Materials and Processes
- Nuclear Materials and Properties
- Titanium Alloys Microstructure and Properties
- Rock Mechanics and Modeling
- Material Properties and Failure Mechanisms
- Diamond and Carbon-based Materials Research
- Adhesion, Friction, and Surface Interactions
- Cancer-related Molecular Pathways
Stowers Institute for Medical Research
2025
TU Dortmund University
2013-2021
Faurecia (Germany)
2021
Ruhr University Bochum
2016-2020
City University of Hong Kong
2019
Dalian University of Technology
2019
Forming Technologies (Canada)
2015
University of Siegen
2015
University of Baghdad
2015
Micromechanical modeling of material behavior has become an accepted approach to describe the macroscopic mechanical properties polycrystalline materials in a micro- structure-sensitive way. The microstructure is modeled by representative volume ele- ment (RVE), and anisotropic individual grains described crystal plasticity model. Such micromechanical models are subjected loads finite element (FE) simulation their obtained from homogenization procedure. However, such simulations with...
A fundamental prerequisite for the micromechanical simulation of fatigue is appropriate modelling effective cyclic properties considered material. Therefore, kinematic hardening formulations on slip system level are crucial importance due to their relevance in material modelling. The focus this study comparison three different models (Armstrong Frederick, Chaboche, and Ohno–Wang). In work, investigations performed prediction stress-strain behavior martensitic high-strength steel SAE 4150 two...
Hydrogen transport behaviour in metals is greatly influenced by the mechanical stress and underlying microstructural features. In this work, a micromechanical model based on coupled crystal plasticity hydrogen diffusion developed applied to storage polycrystalline microstructure. Particular emphasis laid influences transport, invoked internal stresses trapping of dislocations generated plastic strains. First, study precharged material carried out where allowed redistribute under influence...
Craniofacial microsomia (CFM) is a genetically and phenotypically heterogeneous disorder characterized by hypoplasia of facial tissue that often asymmetric. Affected tissues typically include the ears (external internal), mandible, maxilla, but various extracranial anomalies have also been reported. Loss-of-function variants in SF3B2 gene recently reported 8 cases CFM, representing one more common genetic causes identified to date. To better define full phenotypic spectrum associated with ,...
Abstract
Martensitic high-strength steels are prone to exhibit premature fatigue failure due crack nucleation at non-metallic inclusions and other microstructural defects. This study investigates the behavior of martensitic steel SAE 4150 different defects by means micromechanical simulations. Inclusion statistics based on experimental data serve as a reference for identification failure-relevant material interest. A comprehensive numerical design experiment was performed systematically assess...
Additive manufacturing (AM) has recently become one of the key processes in era Industry 4.0 because its highly flexible production scheme. Due to complex thermal cycles during process itself and special solidification conditions, microstructure AM components often exhibits elongated grains together with a pronounced texture. These microstructural features significantly contribute an anisotropic mechanical behavior. In this work, properties additively manufactured samples 316L stainless...
Micromechanical fatigue lifetime predictions, in particular for the high cycle regime, require an appropriate modelling of mean stress effects order to account reducing positive stresses. Focus this micromechanical study is comparison three selected indicator parameters (FIPs), with respect their applicability different total strain ratios. In work, investigations are performed on and prediction crack initiation life martensitic high-strength steel SAE 4150 two First, multiple statistical...
In order to capture the stress-strain response of metallic materials under cyclic loading, it is necessary consider hardening behaviour in constitutive model. Among different approaches available literature, Chaboche model proves be very efficient and convenient kinematic ratcheting observed during loading. The purpose this study determine material parameters by using isotropic J2 plasticity micromechanical crystal (CP) models as rules finite element modelling. As material, we chose a...
The application of instrumented indentation to assess material properties like Young's modulus and microhardness has become a standard method. In recent developments, experiments simulations have been combined inverse methods, from which further parameters such as yield strength, work hardening rate, tensile strength can be determined. this work, an method is introduced by for cyclic plasticity, i.e., kinematic parameters, To accomplish this, Vickers are with finite element the unknown...
Solid state amorphization is induced by shock, irradiation and deformation, while deformation complete remains a challenge in bulk solid. Brittle-to-ductile transition (BDT) mechanism elusive at loading speeds of m/s nanoscale depth cut. Existing formula has no effects shape radius cutting edges on the critical cut BDT. In this study, new route proposed solid confirmed transmission electron microscopy (TEM). This performed novel approach ultraprecision grinding, conducted specially designed...
The application of instrumented indentation to assess material properties like Young’s modulus and micro-hardness has become a standard method. In recent developments, experiments simulations have been combined inverse methods, from which further parameters as yield strength, work hardening rate, tensile strength can be determined. this work, an method is introduced by for cyclic plasticity, i.e. kinematic parameters, To accomplish this, Vickers are with finite element the unknown...
In most forming processes based on tailored blanks, the tool material remains same as that of sheet metal blanks without properties. A novel concept lightweight construction for deep drawing tools is presented in this work to improve behavior blanks. The investigations here deal with dissimilar strengths using dies made two different materials. area steel blank higher strength, typical used. low-strength steel, a hybrid out polymer and fiber-reinforced surface replaces half. Cylindrical cups...
Being one of the most commonly applied sheet metal forming processes in automotive industry, deep drawing technologies are challenged by concerns global warming for higher fuel economy requirements recent years. To reduce weight vehicles order to obtain economy, lighter and safer materials used industry. Aluminum alloys, due their low density compared steels, an important group materials, particular lightweight construction vehicles. In this study, two different aluminum namely AA5754-H22...
Springback is considered as one of the major problems in sheet metal forming. It leads to assembly defects and cause a huge amount cost for tool modifications. In this work incremental analysis springback has been presented. Development with punch travel analyzed simple U draw-bend geometry, tunnel geometry open base modified closed variable flange height. The effect tension variation steering parameter various profiles varying are studied, which would generate different tensile forces...