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  1. Article: Simplified Numerical Model for Determining Load-Bearing Capacity of Steel-Wire Ropes.

    Hroncek, Juraj / Marsalek, Pavel / Rybansky, David / Sotola, Martin / Drahorad, Lukas / Lesnak, Michal / Fusek, Martin

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 10

    Abstract: Steel-wire rope is a mechanical component that has versatile uses and on which human lives depend. One of the basic parameters that serve to describe the rope is its load-bearing capacity. The static load-bearing capacity is a mechanical property ... ...

    Abstract Steel-wire rope is a mechanical component that has versatile uses and on which human lives depend. One of the basic parameters that serve to describe the rope is its load-bearing capacity. The static load-bearing capacity is a mechanical property characterized by the limit static force that the rope is able to endure before it breaks. This value depends mainly on the cross-section and the material of the rope. The load-bearing capacity of the entire rope is obtained in tensile experimental tests. This method is expensive and sometimes unavailable due to the load limit of testing machines. At present, another common method uses numerical modeling to simulate an experimental test and evaluates the load-bearing capacity. The finite element method is used to describe the numerical model. The general procedure for solving engineering tasks of load-bearing capacity is by using the volume (3D) elements of a finite element mesh. The computational complexity of such a non-linear task is high. Due to the usability of the method and its implementation in practice, it is necessary to simplify the model and reduce the calculation time. Therefore, this article deals with the creation of a static numerical model which can evaluate the load-bearing capacity of steel ropes in a short time without compromising accuracy. The proposed model describes wires using beam elements instead of volume elements. The output of modeling is the response of each rope to its displacement and the evaluation of plastic strains in the ropes at selected load levels. In this article, a simplified numerical model is designed and applied to two constructions of steel ropes, namely the single strand rope 1 × 37 and multi-strand rope 6 × 7-WSC.
    Language English
    Publishing date 2023-05-16
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16103756
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Special Issue: Selected Papers from Experimental Stress Analysis 2020.

    Kunčická, Lenka / Halama, Radim / Fusek, Martin

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 5

    Abstract: The contemporary way of living brings about increasing demands on materials used in our everyday lives [ ... ]. ...

    Abstract The contemporary way of living brings about increasing demands on materials used in our everyday lives [...].
    Language English
    Publishing date 2021-02-28
    Publishing country Switzerland
    Document type Editorial
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14051136
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Parameters Identification of the Anand Material Model for 3D Printed Structures.

    Fusek, Martin / Paška, Zbyněk / Rojíček, Jaroslav / Fojtík, František

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 3

    Abstract: Currently, there is an increasing use of machine parts manufactured using 3D printing technology. For the numerical prediction of the behavior of such printed parts, it is necessary to choose a suitable material model and the corresponding material ... ...

    Abstract Currently, there is an increasing use of machine parts manufactured using 3D printing technology. For the numerical prediction of the behavior of such printed parts, it is necessary to choose a suitable material model and the corresponding material parameters. This paper focuses on the determination of material parameters of the Anand material model for acrylonitrile butadiene styrene (ABS-M30) material. Material parameters were determined using the genetic algorithm (GA) method using finite element method (FEM) calculations. The FEM simulations were subsequently adjusted to experimental tests carried out to achieve the possible best agreement. Several experimental tensile and indentation tests were performed. The tests were set up in such a way that the relaxation and creep behaviors were at least partially captured. Experimental tests were performed at temperatures of 23 °C, 44 °C, 60 °C, and 80 °C. The results obtained suggest that the Anand material model can also be used for ABS-M30 plastic material, but only if the goal is not to detect anisotropic behavior. Future work will focus on the search for a suitable material model that would be able to capture the anisotropic behavior of printed plastic materials.
    Language English
    Publishing date 2021-01-27
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14030587
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Study of Optimal Cam Design of Dual-Axle Spring-Loaded Camming Device.

    Rybansky, David / Sotola, Martin / Marsalek, Pavel / Poruba, Zdenek / Fusek, Martin

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 8

    Abstract: The spring-loaded camming device (SLCD), also known as "friend", is a simple mechanism used to ensure the safety of the climber through fall prevention. SLCD consists of two pairs of opposing cams rotating separately, with one (single-axle SLCD) or two ( ... ...

    Abstract The spring-loaded camming device (SLCD), also known as "friend", is a simple mechanism used to ensure the safety of the climber through fall prevention. SLCD consists of two pairs of opposing cams rotating separately, with one (single-axle SLCD) or two (dual-axle SLCD) pins connecting the opposing cams, a stem, connected to the pins, providing the attachment of the climbing rope, springs, which simultaneously push cams to a fully expanded position, and an operating element controlling the cam position. The expansion of cams is thus adaptable to allow insertion or removal of the device into/from a rock crack. While the pins, stem, operating element, and springs can be considered optimal, the (especially internal) shape of the cam allows space for improvement, especially where the weight is concerned. This paper focuses on optimizing the internal shape of the dual-axle SLCD cam from the perspective of the weight/stiffness trade-off. For this purpose, two computational models are designed and multi-step topology optimization (TOP) are performed. From the computational models' point of view, SLCD is considered symmetric and only one cam is optimized and smoothened using parametric curves. Finally, the load-bearing capacity of the new cam design is analyzed. This work is based on practical industry requirements, and the obtained results will be reflected in a new commercial design of SLCD.
    Language English
    Publishing date 2021-04-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14081940
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Validation of Multiaxial Fatigue Strength Criteria on Specimens from Structural Steel in the High-Cycle Fatigue Region.

    Fojtík, František / Papuga, Jan / Fusek, Martin / Halama, Radim

    Materials (Basel, Switzerland)

    2020  Volume 14, Issue 1

    Abstract: The paper describes results of fatigue strength estimates by selected multiaxial fatigue strength criteria in the region of high-cycle fatigue, and compares them with own experimental results obtained on hollow specimens made from ČSN 41 1523 structural ... ...

    Abstract The paper describes results of fatigue strength estimates by selected multiaxial fatigue strength criteria in the region of high-cycle fatigue, and compares them with own experimental results obtained on hollow specimens made from ČSN 41 1523 structural steel. The specimens were loaded by various combinations of load channels comprising push-pull, torsion, bending and inner and outer pressures. The prediction methods were validated on fatigue strengths at seven different numbers of cycles spanning from 100,000 to 10,000,000 cycles. No substantial deviation of results based on the selected lifetime was observed. The PCRN method and the QCP method provide best results compared with other assessed methods. The results of the MMP criterion that allows users to evaluate the multiaxial fatigue loading quickly are also of interest because the method provides results only slightly worse than the two best performing solutions.
    Language English
    Publishing date 2020-12-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14010116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book: Aspartic proteinases

    Fusek, Martin / Větvička, Václav

    physiology and pathology

    1995  

    Author's details Martin Fusek ; Václav Větvička
    Keywords Aspartic Proteinases
    Language English
    Size 308 S. : Ill., graph. Darst.
    Publisher CRC Press
    Publishing place Boca Raton u.a.
    Publishing country United States
    Document type Book
    HBZ-ID HT007409140
    ISBN 0-8493-7660-2 ; 978-0-8493-7660-3
    Database Catalogue ZB MED Medicine, Health

    Kategorien

    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    1997 A 676 order for loan Magazin

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  7. Article: Damage Analysis of Composite CFRP Tubes Using Acoustic Emission Monitoring and Pattern Recognition Approach.

    Šofer, Michal / Cienciala, Jakub / Fusek, Martin / Pavlíček, Pavel / Moravec, Richard

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 4

    Abstract: The acoustic emission method has been adopted for detection of damage mechanisms in carbon-fiber-reinforced polymer composite tubes during the three-point bending test. The damage evolution process of the individual samples has been monitored using the ... ...

    Abstract The acoustic emission method has been adopted for detection of damage mechanisms in carbon-fiber-reinforced polymer composite tubes during the three-point bending test. The damage evolution process of the individual samples has been monitored using the acoustic emission method, which is one of the non-destructive methods. The obtained data were then subjected to a two-step technique, which combines the unsupervised pattern recognition approach utilizing the short-time frequency spectra with the boundary curve enabling the already clustered data to be additionally filtered. The boundary curve identification has been carried out on the basis of preliminary tensile tests of the carbon fiber sheafs, where, by overlapping the force versus time dependency by the acoustic emission activity versus time dependency, it was possible to identify the boundary which will separate the signals originating from the fiber break from unwanted secondary sources. The application of the presented two-step method resulted in the identification of the failure mechanisms such as matrix cracking, fiber break, decohesion, and debonding. Besides the comparison of the results with already published research papers, the study presents the comprehensive parametric acoustic emission signal analysis of the individual clusters.
    Language English
    Publishing date 2021-02-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14040786
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Book: Biologická léčiva

    Fusek, Martin

    teoretické základy a klinická praxe

    2012  

    Author's details Martin Fusek [and 4 others] a kolektiv
    MeSH term(s) Biological Therapy
    Language Czech ; English
    Size 219 pages :, illustrations
    Edition 1. vydání.
    Document type Book
    Note Text in Czech, summary also in English.
    ISBN 9788024737270 ; 8024737272
    Database Catalogue of the US National Library of Medicine (NLM)

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  9. Article: Modeling and Testing of Flexible Structures with Selected Planar Patterns Used in Biomedical Applications.

    Marsalek, Pavel / Sotola, Martin / Rybansky, David / Repa, Vojtech / Halama, Radim / Fusek, Martin / Prokop, Jiri

    Materials (Basel, Switzerland)

    2020  Volume 14, Issue 1

    Abstract: Flexible structures (FS) are thin shells with a pattern of holes. The stiffness of the structure in the normal direction is reduced by the shape of gaps rather than by the choice of the material based on mechanical properties such as Young's modulus. ... ...

    Abstract Flexible structures (FS) are thin shells with a pattern of holes. The stiffness of the structure in the normal direction is reduced by the shape of gaps rather than by the choice of the material based on mechanical properties such as Young's modulus. This paper presents virtual prototyping of 3D printed flexible structures with selected planar patterns using laboratory testing and computer modeling. The objective of this work is to develop a non-linear computational model evaluating the structure's stiffness and its experimental verification; in addition, we aimed to identify the best of the proposed patterns with respect to its stiffness: load-bearing capacity ratio. Following validation, the validated computational model is used for a parametric study of selected patterns. Nylon-Polyamide 12-was chosen for the purposes of this study as an appropriate flexible material suitable for 3D printing. At the end of the work, a computational model of the selected structure with modeling of load-bearing capacity is presented. The obtained results can be used in the design of external biomedical applications such as orthoses, prostheses, cranial remoulding helmets padding, or a new type of adaptive cushions. This paper is an extension of the conference paper: "Modeling and Testing of 3D Printed Flexible Structures with Three-pointed Star Pattern Used in Biomedical Applications" by authors Repa et al.
    Language English
    Publishing date 2020-12-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14010140
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Surface Magnetostriction of FeCoB Amorphous Ribbons Analyzed Using Magneto-Optical Kerr Microscopy.

    Hrabovská, Kamila / Životský, Ondřej / Rojíček, Jaroslav / Fusek, Martin / Mareš, Vratislav / Jirásková, Yvonna

    Materials (Basel, Switzerland)

    2020  Volume 13, Issue 2

    Abstract: Surface sensitive magneto-optical Kerr microscopy completed with the special self-made sample holder is used for studying the magneto-elastic behaviour in the surface of the as-quenched amorphous ... ...

    Abstract Surface sensitive magneto-optical Kerr microscopy completed with the special self-made sample holder is used for studying the magneto-elastic behaviour in the surface of the as-quenched amorphous Fe
    Language English
    Publishing date 2020-01-07
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma13020257
    Database MEDical Literature Analysis and Retrieval System OnLINE

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