A5048051323- Fatigue and fracture mechanics
- Microstructure and mechanical properties
- High Temperature Alloys and Creep
- Metal Forming Simulation Techniques
- Aluminum Alloys Composites Properties
- Additive Manufacturing Materials and Processes
- Additive Manufacturing and 3D Printing Technologies
- High-Velocity Impact and Material Behavior
- Aluminum Alloy Microstructure Properties
- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Material Properties and Failure Mechanisms
- Nuclear Materials and Properties
- Magnesium Alloys: Properties and Applications
- Fire effects on concrete materials
- Titanium Alloys Microstructure and Properties
- Welding Techniques and Residual Stresses
- Advanced Welding Techniques Analysis
- Engineering Structural Analysis Methods
- Mechanical stress and fatigue analysis
- Mechanical Failure Analysis and Simulation
- Hydrogen embrittlement and corrosion behaviors in metals
- Surface Treatment and Residual Stress
- Probabilistic and Robust Engineering Design
- Metal and Thin Film Mechanics
Czech Academy of Sciences, Institute of Physics of Materials
2015-2024
Czech Academy of Sciences
1994-2018
Institute of Metallurgy
1982-1992
Recent research efforts in additive manufacturing have focused on developing parts made of Inconel 718 (IN 718), a nickel-based superalloy, which is an attractive material for aerospace and energy high-temperature applications. Here the selective laser melting (SLM) process used to transform alloy powder into solid IN followed by optimal stress-relief subsequent precipitation hardening treatment. Two main aspects were investigated. The microstructure generated SLM was characterized using...
Abstract The fact that very small notches (cavities, holes, scratches, etc.) have no effect on the fatigue limit of metallic materials is well known. This paper presents both a qualitative explanation for existence non‐damaging and quantitative derivation their critical sizes. condition notch (characterized by stress concentration factor K t root radius ρ) to be in material crack size l 0 ) ( 2 − 1)ρ≤ 4.5 . can expressed with good approximation terms threshold intensity growth plain limit....
Perhaps the most thoroughly studied feature of cyclic plasticity has been persistent slip bands (PSBs) formed in some metals during loading. The aim this paper is to delimit conditions for occurrence PSBs and discuss their role fatigue process all its stages, that hardening resulting a saturated stress–strain response, initiation microcracks propagation cracks. are zones high activity. Therefore response depends on volume fraction ratio activities within those outside PSB. plastic...
The main interest in Additive Manufacturing (AM) technology relates to its ability produce complex components with relatively reduced weight that are difficult or cannot be produced by other conventional technologies. Selective laser melting (SLM) is extensively used, as one of the AM technologies fabricate metallic parts. This advanced method allows various parts geometries high three-dimensional (3D) accuracy from fusion powders a layer-by-layer style. Ti6Al4V alloy widely used material...
ABSTRACT Several specific features of high‐cycle fatigue (HCF) and ultra‐high‐cycle (UHCF) are discussed both on the basis direct experimental results speculations extrapolating HCF data to UHCF regions. The following points dealt with: (i) Extent distribution cyclic plastic deformation. (ii) Sensitivity behaviour in regions start‐up procedure test preceding stress–strain history. (iii) Role persistent slip bands (PSBs) microcrack initiation (iv) Dependence notch sensitivity amplitude...
Abstract— The notch size effect (i.e. the decrease of notched fatigue limit with increasing for same stress concentration factor) was quantitatively derived by describing threshold conditions propagation a short semi‐elliptical crack nucleated at root. A close relation between Kitagawa—Takahashi diagram and dependence on shown. experimentally verified several specimen/notch geometries in cases pressure vessel steel copper.
Additive layer manufacturing has recently gained a lot of interest due to the feasibility producing metallic components directly from computer-aided design file part. Selective laser melting, one main additive technologies, is currently capable nearly ready-to-use parts made materials. Their microstructure, however, differs substantially that produced by conventional manufacturing. That why detailed study and knowledge relation specific parameters selective melting process mechanical...
Results of an experimental determination the propagation long fatigue cracks in Ti6Al4V alloy prepared by selective laser melting technology are presented. Direct metal sintering (DMLS) exploiting EOSINT M270 system was used for fabrication compact tension specimens having different orientation relation to build direction. It has been found that there is no substantial influence and thus microstructure exhibiting directionality on growth crack threshold, when optimal process parameters...