A5071832960- Metallurgy and Material Forming
- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Fatigue and fracture mechanics
- Elasticity and Material Modeling
- Ultrasonics and Acoustic Wave Propagation
- High-Velocity Impact and Material Behavior
- Metal Forming Simulation Techniques
- Powder Metallurgy Techniques and Materials
- Numerical methods in engineering
- Rock Mechanics and Modeling
- Mechanical stress and fatigue analysis
- Solidification and crystal growth phenomena
- Aluminum Alloy Microstructure Properties
- Metal Alloys Wear and Properties
- Structural Behavior of Reinforced Concrete
- Asphalt Pavement Performance Evaluation
- Structural Health Monitoring Techniques
- Elasticity and Wave Propagation
- Additive Manufacturing Materials and Processes
- Structural Load-Bearing Analysis
- Structural Integrity and Reliability Analysis
- Composite Material Mechanics
- Hydrogen embrittlement and corrosion behaviors in metals
- Geotechnical Engineering and Underground Structures
Tata Steel (Netherlands)
2022-2024
Max-Planck-Institut für Nachhaltige Materialien
2017-2022
Delft University of Technology
2020-2022
Max Planck Society
2017-2020
Iran University of Science and Technology
2011-2012
Abstract This is a viewpoint paper on recent progress in the understanding of microstructure–property relations advanced high-strength steels (AHSS). These alloys constitute class high-strength, formable that are designed mainly as sheet products for transportation sector. AHSS have often very complex and hierarchical microstructures consisting ferrite, austenite, bainite, or martensite matrix duplex even multiphase mixtures these constituents, sometimes enriched with precipitates....
A severe obstacle for the routine use of crystal plasticity models is effort associated with determining their constitutive parameters. Obtaining these parameters usually requires time-consuming micromechanical tests that allow probing individual grains. In this study, a novel, computationally efficient, and fully automated approach introduced which allows identification from macroscopic tests. The presented here uses response surface methodology together genetic algorithm to determine an...
Physics-based crystal plasticity models rely on certain statistical assumptions about the collective behavior of dislocation populations one slip system and their interactions with dislocations other systems. One main advantage using such physics-based constitutive in kinematic frameworks is suitability for predicting mechanical polycrystals over a wide range deformation temperatures strain rates same parameter set. In this study, ability widely used temperature-dependent...
High-resolution three-dimensional crystal plasticity simulations are used to investigate deformation heterogeneity and microstructure evolution during cold rolling of interstitial free (IF-) steel. A Fast Fourier Transform (FFT)-based spectral solver is conduct using a dislocation-density-based model. The in-grain texture misorientation spread consistent with experimental results obtained electron backscatter diffraction (EBSD) experiments. show that two types strain localization features...
The capability of high-resolution modeling crystals subjected to large plastic strain is essential in predicting many important phenomena occurring polycrystalline materials, such as microstructure, deformation localization and in-grain texture evolution. However, due the heterogeneity polycrystals, simulation mesh gets distorted during deformation. This distortion deteriorates accuracy results, after reaching high local levels, it no longer possible continue simulation. In this work, two...
Predicting microstructure and (micro-)texture evolution during thermo-mechanical processing requires the combined simulation of plastic deformation recrystallization. Here, a approach based on coupling full-field dislocation density crystal plasticity model cellular automaton is presented. A regridding/remeshing procedure used to transfer data between deformed mesh large-strain regular grid automaton. Moreover, physics nucleation criterion has been developed difference changes in orientation...
In this paper, a four-layer road structure consisting of an edge transverse crack is simulated using three-dimensional finite element method in order to capture the influence single-axle wheel load on propagation through asphalt concrete layer. Different positions vehicular relative cracked area are considered analyses. Linear elastic fracture mechanics (LEFM) used for investigating effect traffic behavior propagating within concrete. The results obtained show that front experiences all...
A cellular automaton algorithm for curvature-driven coarsening is applied to a cold-rolled interstitial-free steel's microstructure - obtained through electron backscatter diffraction (EBSD). Recrystallization nucleation occurs naturally during the simulation, due highly heterogeneous and hence competitive growth among pre-existing (sub) grains. The spatial inhomogeneity of subgrain that takes place derives from large local variations sizes misorientations comprise prior deformed state....
The microstructure of metals and foams can be effectively modelled with anisotropic power diagrams (APDs), which provide control over the shape individual grains. One major obstacle to wider adoption APDs is computational cost that associated their generation. We propose a novel approach generate prescribed statistical properties, including fine size To this end, we rely on fast optimal transport algorithms stream well Graphics Processing Units (GPU) handle non-uniform, distance functions....
The shape and size of the plastic zone around crack tip are analyzed under pure mode I, II mixed (I+II) loading for small scale yielding both plane stress strain conditions. A new analytical formulation is presented to determine radius in a non-dimensional form. In particular, effect T-stress on studied. results this investigation indicate that field with always yields larger than without T-stress. It found predominantly I loading, negative more dramatic positive However, when portion...
Over the recent years, an increasing attention has been devoted to study effect of higher order terms Williams’ series expansion in fracture mechanics problems. It shown that stress and strain fields around crack tip are influenced considerably by constant term, T-stress, considering this term leads better results. Several criteria have developed describe brittle failure linear elastic bodies, when subjected mixed mode (I/II) loading. In paper, conventional criteria, namely maximum...
In an industrial context, selecting appropriate crystal plasticity (CP) model that balances efficiency and accuracy when modelling deformation texture (DT) is crucial. This study compared DTs in IF-steel after undergoing cold rolling reductions using different CP models for two input scenarios. Three mean-field (MFCP) were utilised their most basic configurations, without considering grain fragmentation or strain hardening, addition to a dislocation-density-based full-field (FFCP) model. The...
Whole-field techniques like Electronic Speckle Pattern Interferometry (ESPI) are proven as a suitable way to investigate the fracture mechanics problems. In present study, speckle interferometry was used analyze double edge crack in finite plate under tension. "Spider web configuration" has high accuracy and therefore is an efficient method for LEFM The interaction shown Polymethylmethacrylate with tow collinear model images captured before after loading separately by resolution CCD camera....
In many previous investigations, the mode I stress intensity factor has been usedalone to analyse and predict life of cracked cylindrical components. this article, three-dimensional elastic finite element method was used semi-elliptical cracks located in concentration area a nozzle–vessel junction. Stress factors T-stresses were calculated for different geometrical configurations crack junction under external loading conditions. The influence these various parameters conditions on both...
The microstructure of metals and foams can be effectively modelled with anisotropic power diagrams (APDs), which provide control over the shape individual grains. One major obstacle to wider adoption APDs is computational cost that associated their generation. We propose a novel approach generate prescribed statistical properties, including fine size To this end, we rely on fast optimal transport algorithms stream well Graphics Processing Units (GPU) handle non-uniform, distance functions....