Jan Falta
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View article: Commissioning of universal Split Hopkinson Bar for dynamic compression and tension experiments
Commissioning of universal Split Hopkinson Bar for dynamic compression and tension experiments Open
Split Hopkinson Bar is an experimental apparatus designed for acquiring material properties in dynamic regime. The apparatus is usually constructed as a single purpose experimental device for specific type of loading, most commonly either …
View article: Split Hopkinson bar and flash X-ray characterization of ultra high performance concrete reinforced by steel fibers subjected to dynamic compression
Split Hopkinson bar and flash X-ray characterization of ultra high performance concrete reinforced by steel fibers subjected to dynamic compression Open
Excellent mechanical properties of ultra high performance concrete make it suitable for use in special applications, where the material is subjected to dynamic phenomena such as impacts, explosions, or earthquakes. This paper presents a no…
View article: Ageing effects on the mechanical properties stability of 3D printed material under compression
Ageing effects on the mechanical properties stability of 3D printed material under compression Open
The paper deals with the examination of the ageing effects on the mechanical properties stability of 3D printed material via stereolithography under compression when subjected to various conditions, including UV radiation, X-rays, and the …
View article: Discovering chiral auxetic structures with near-zero Poisson's ratio using an active learning strategy
Discovering chiral auxetic structures with near-zero Poisson's ratio using an active learning strategy Open
In this paper, a set of hexachiral auxetic structural designs with near zero Poisson's ratio (ZPR) characteristics is discovered via the combination of machine learning and experimentally validated finite element simulation. An active lear…
View article: Response of the ultra high performance concrete under dynamic compressive loading
Response of the ultra high performance concrete under dynamic compressive loading Open
Ultra high performance concrete is a modern cementitious material which exhibits excellent mechanical properties such as damage tolerance, fracture toughness and durability. These features make this materials suitable for wide range of app…
View article: High-speed X-ray radiography for experiments in impact dynamics using high-power X-ray tube, cesium iodine scintillator and laboratory optical camera
High-speed X-ray radiography for experiments in impact dynamics using high-power X-ray tube, cesium iodine scintillator and laboratory optical camera Open
X-ray radiography and computed tomography have become well-established methods for investigation of internal structure of objects and for defectoscopy. Recently, the methods have even been used for in-situ analysis of materials under mecha…
View article: Mechanical properties of basalt: a study on compressive loading at different strain rates using SHPB
Mechanical properties of basalt: a study on compressive loading at different strain rates using SHPB Open
This article focuses on the mechanical properties of basalt in compressive loading at different strain-rates. The study employs advanced instrumentation for the evaluation of the results in dynamic conditions, while standard uni-axial load…
View article: Asynchronous time integration while achieving zero interface energy
Asynchronous time integration while achieving zero interface energy Open
This contribution deals with an asynchronous direct time integration of the finite-element model. The proposed method is applied to the phenomenon of wave propagation through an elastic linear continuum. The numerical model is partitioned …
View article: Effect of aging on mechanical properties of 3D printed samples using stereolitography
Effect of aging on mechanical properties of 3D printed samples using stereolitography Open
This paper focuses on stereolithography (an additive manufacturing technology working on the principle of curing liquid resins layer by layer using ultraviolet radiation) and the effect of aging on the mechanical properties of the material…
View article: Stereolithography for manufacturing of advanced porous solids
Stereolithography for manufacturing of advanced porous solids Open
The aim of this paper is focused on benefits of stereolithography (SLA) technology for the fabrication of the lightweight lattice structures with potential for load-bearing function and high absorption of impact energy. SLA is an additive …
View article: Instrumented Dynamic Penetration of Sandwich Panels with Auxetic and Non‐Auxetic Core using Direct Impact Hopkinson Bar
Instrumented Dynamic Penetration of Sandwich Panels with Auxetic and Non‐Auxetic Core using Direct Impact Hopkinson Bar Open
This article deals with the dynamic penetration of 3D‐printed panels with auxetic and conventional honeycomb unit cell‐based cores. The geometry of the unit cells and their periodic assembly in the resulting lattices are selected to ensure…
View article: Design exploration of additively manufactured chiral auxetic structure using explainable machine learning
Design exploration of additively manufactured chiral auxetic structure using explainable machine learning Open
A design exploration of hexachiral structures using explainable machine learning (ML) is performed in this work. The hexachiral structures are fabricated using resin via vat photopolymerization (VPP). The ML model is used to build the func…
View article: Strain Rate-Dependent Compressive Properties of Bulk Cylindrical 3D-Printed Samples from 316L Stainless Steel
Strain Rate-Dependent Compressive Properties of Bulk Cylindrical 3D-Printed Samples from 316L Stainless Steel Open
The main aim of the study was to analyse the strain rate sensitivity of the compressive deformation response in bulk 3D-printed samples from 316L stainless steel according to the printing orientation. The laser powder bed fusion (LPBF) met…
View article: Strain-rate dependent compressive properties of inverted honeycomb lattice and bulk cylindrical samples 3D printed by MSLA method
Strain-rate dependent compressive properties of inverted honeycomb lattice and bulk cylindrical samples 3D printed by MSLA method Open
Masked Stereolithography (MSLA) is an additive manufacturing process based on the photocuring of an entire printed layer of resin at once with the use of a UV light source, in this case a monochrome LCD display.The prints can be used not o…
View article: High Strain‐Rate Compression Experiments on Ni/Polyurethane Hybrid Metal Foams Using the Split‐Hopkinson Pressure Bar Technique
High Strain‐Rate Compression Experiments on Ni/Polyurethane Hybrid Metal Foams Using the Split‐Hopkinson Pressure Bar Technique Open
Open‐cell metal foams are a versatile class of porous lightweight materials, which are predominantly used as kinetic energy absorbers in a wide scope of applications. Based on their bio‐inspired inhomogeneous 3D porous structure, they are …
View article: Compressive Behaviour of Additively Manufactured Periodical Re-Entrant Tetrakaidecahedral Lattices at Low and High Strain-Rates
Compressive Behaviour of Additively Manufactured Periodical Re-Entrant Tetrakaidecahedral Lattices at Low and High Strain-Rates Open
Compressive deformation behaviour of additively manufactured lattice structures based on re-entrant tetrakaidecahedral unit-cell geometry were experimentally investigated under quasi-static and dynamic loading conditions. Specimens of four…
View article: Hybrid Auxetic Structures: Structural Optimization and Mechanical Characterization
Hybrid Auxetic Structures: Structural Optimization and Mechanical Characterization Open
With their increased energy absorption capacity, auxetic materials are perfectly fit to develop new, enhanced lightweight crash absorbers for cars. Herein, the mass distribution along the struts is optimized via finite element analysis wit…
View article: Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates
Dynamic Deformation Behaviour of Chiral Auxetic Lattices at Low and High Strain-Rates Open
The mechanical behaviour of three different auxetic cellular structures, hexa-chiral 2D, tetra-chiral 2D and tetra-chiral 3D, was experimentally investigated in this study. The structures were produced with the powder bed fusion method (PB…
View article: Dynamic impact testing of cellular solids and lattice structures: Application of two-sided direct impact Hopkinson bar
Dynamic impact testing of cellular solids and lattice structures: Application of two-sided direct impact Hopkinson bar Open
Direct impact testing with a Hopkinson bar is, nowadays, a very popular experimental technique for investigating
\nthe behavior of cellular materials, e.g., lattice metamaterials, at high strain-rates as it overcomes several limitations of…
View article: Impact Behavior of Additively Manufactured Stainless Steel Auxetic Structures at Elevated and Reduced Temperatures
Impact Behavior of Additively Manufactured Stainless Steel Auxetic Structures at Elevated and Reduced Temperatures Open
Metamaterials produced using additive manufacturing represent advanced structures with tunable properties and deformation characteristics. However, the manufacturing process, imperfections in geometry, properties of the base material as we…
View article: Dynamic penetration of cellular solids: Experimental investigation using Hopkinson bar and computed tomography
Dynamic penetration of cellular solids: Experimental investigation using Hopkinson bar and computed tomography Open
Light-weight cellular solids, such as aluminium foams, are promising materials for use in ballistic impact mitigation applications for their high specific deformation energy absorption capabilities. In this study, three different types of …
View article: DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING
DIRECT MEASUREMENT OF REACTION FORCES DURING FAST DYNAMIC LOADING Open
The presented paper is focused on embedding of the serially manufactured piezo-electric impact loadcell into Open Hopkinson Pressure Bar (OHPB) and it’s modifications for a direct force measurement during dynamic loading. Conventionally, d…