Martin Stejskal

@zcu.cz

Department of Machine Design, Faculty of Mechanical Engineering
University of West Bohemia

Martin Stejskal


                     Download Compact PDF  
https://researchid.co/stejs55

RESEARCH, TEACHING, or OTHER INTERESTS

Mechanical Engineering, Mechanics of Materials
5

Scopus Publications

12

Scholar Citations

2

Scholar h-index

Scopus Publications

  • Design and Simulation of Automated Pod Handling for Modular Rail-Based Transport Systems
    Karel Ráž, Martin Stejskal, Weldu Subagadis Redakum
    Logistics, 2026
    Background: Modular and autonomous rail-based transport concepts promise increased flexibility and efficiency, but their feasibility strongly depends on reliable and scalable terminal handling operations. In such systems, transport units must be safely and rapidly coupled to carrier units without manual intervention. Methods: This study presents a structured pod-handling concept for a modular rail transport system, covering transport unit preparation, crane-based lifting and positioning, mechanical coupling via twist-lock interfaces, and automated electrical and media connections. To evaluate operational performance, a discrete-event simulation model was developed in AnyLogic that represents the complete loading process from order reception to pod dispatch. Results: Simulation results show that a single crane is sufficient under low-demand conditions, maintaining an average processing time of approximately 12 min per order. As demand increases, system performance becomes highly sensitive to crane availability; insufficient resources lead to excessive waiting times. For high-frequency demand, scalable crane allocation is required to preserve stable throughput. Conclusions: The results confirm that automated pod-handling mechanisms, combined with demand-adaptive terminal resources, are essential for the viability of modular rail pod systems. The proposed process model and simulation framework guide terminal design and support the integration of decentralised rail pods into future multimodal mobility and logistics networks.
  • Shear Performance and Numerical Simulation of Adhesively Bonded Joints in Multi-Jet Fusion 3D-Printed Polyamide Components
    Frantisek Sedlacek, Martin Stejskal, Nikola Bednarova, Ondrej Spacek
    Polymers, 2025
    Additive manufacturing technologies are no longer limited to rapid prototyping but are increasingly used for low-volume production of functional end-use components. Among advanced AM techniques, HP Multi-Jet Fusion (MJF) stands out for its high precision and efficiency. Polyamides, thanks to their balanced mechanical and thermal properties, are commonly used as building materials in this technology. However, these materials are notoriously difficult to bond with conventional adhesives. This study investigates the shear strength of bonded joints made from two frequently used MJF materials—PA12 and glass-bead-filled PA12—using four different industrial adhesives. Experimental procedures were conducted according to ASTM standards. Specimens for single-lap-shear tests were fabricated on an HP MJF 4200 series printer, bonded using a custom jig, and tested on a Zwick-Roell Z250 electro-mechanical testing machine. Surface roughness of the adherends was measured with a 3D optical microscope to assess its influence on bonding performance. The polyurethane-based adhesive (3M Scotch-Weld DP620NS) demonstrated superior performance with maximum shear strengths of 5.0 ± 0.35 MPa for PA12 and 4.4 ± 0.03 MPa for PA12GB, representing 30% and 17% higher strength, respectively, compared to epoxy-based alternatives. The hybrid cyanoacrylate–epoxy adhesive (Loctite HY4090) was the only system showing improved performance with glass-bead-reinforced substrate (16.5% increase from PA12 to PA12GB). Statistical analysis confirmed significant differences between adhesive types (F3,24 = 31.37, p < 0.001), with adhesive selection accounting for 65.7% of total performance variance. In addition to the experimental work, a finite element-based numerical simulation was performed to analyze the distribution of shear and peel stresses across the adhesive layer using Siemens Simcenter 3D 2406 software with the NX Nastran solver. The numerical results were compared with analytical predictions from the Volkersen and Goland–Reissner models.
  • Towards Sustainable Composite Structures: Experimental Characterisation and Damage Modelling of Unidirectional Flax Fibre-Reinforced Polymers
    Martin Stejskal, Frantisek Sedlacek, Ondrej Spacek, Nikola Bednarova, Jan Krystek
    Polymers, 2025
    The increasing demand for sustainable engineering solutions has driven extensive research into natural fibre-reinforced composites (NFCs), notably flax fibre-reinforced polymers (FFRPs), which offer promising eco-friendly alternatives to synthetic composites. This study presents a comprehensive application of continuum damage mechanics (CDM) methodology to unidirectional (UD) FFRPs, addressing critical gaps in predictive modelling of progressive intralaminar damage for sustainable structural applications. A systematic experimental characterisation protocol was developed to identify material parameters that account for the inherent variability and complex nonlinear behaviour of natural fibres. The CDM model was calibrated using comprehensive quasi-static testing on multiple laminate configurations and validated through finite element analysis (FEA) in Siemens Simcenter Samcef. The model accurately captures the nonlinear behaviour and damage mechanisms of notched flax–epoxy laminates, achieving prediction accuracies of 97.61% and 88.98% for the force-displacement response in open-hole tensile (OHT) validation tests. Integrating experimental characterisation with FEA enables robust virtual prototyping of sustainable composite structures, supporting design optimisation and lifecycle assessment. This research establishes validated damage modelling methodologies for eco-friendly NFC, facilitating accelerated adoption in automotive, marine, and construction sectors.
  • Determination of Mechanical Properties of Blind Rivet Joints Using Numerical Simulations and Experimental Testing
    Martin Beber, Martin Stejskal, Frantisek Sedlacek
    Materials, 2025
    This study explores the tensile performance of blind rivet joints in galvanized steel sheets, focusing on their behavior under shear and normal load conditions. Blind rivets are frequently used in structural applications due to their ease of installation and ability to be applied from one side, making them highly effective in industries like aerospace and automotive. Two types of DIN 7337—4.8 × 8 blind rivets—galvanized steel St/St and stainless steel A2/A2—paired with galvanized steel sheets DX51D + Z275, were experimentally tested to assess how their material properties affect their joint strength, deformation patterns, and failure modes. Single-lap shear, double-lap shear, and pure normal load tests were conducted in multiple configurations to evaluate joint performance under varying loading conditions, simulating real-world stresses. Using custom-built equipment, controlled forces were applied perpendicular to the rivet joints to replicate practical loading conditions. The results revealed distinct differences in the load-bearing capacities of the two materials, offering valuable insights for applications where corrosion resistance and structural integrity are critical. Finite element analysis (FEA) was then used to simulate the behavior of the joints, with the results validated against experimental data. To enhance the reliability of numerical simulations in optimizing the design of rivet joints, a methodology was proposed to calibrate non-linear FEA models to experimental results, and a substantial agreement of 92.53% was achieved via optimization in ANSYS OptiSLang. This research contributes to our broader understanding of riveted connections, providing practical recommendations for assessing the performance of such joints in various engineering fields.
  • ENVIRONMENTAL IMPACTS OF STRUCTURALLY OPTIMIZED GFRP TANKS: A LIFE CYCLE ASSESSMENT APPROACH SUPPORTING CIRCULAR ECONOMY STRATEGIES
    Ondrej Spacek, Frantisek Sedlacek, Nikola Bednarova, Ivona Adamikova, Martin Stejskal
    International Multidisciplinary Scientific Geoconference Surveying Geology and Mining Ecology Management Sgem, 2025
    Horizontal composite tanks represent critical components in industrial applications where achieving an optimal balance between mechanical performance, material efficiency, and environmental impact is essential. This study investigates the environmental performance of structurally optimized glass-fiber-reinforced polymer (GFRP) horizontal tanks featuring progressive rib thickness configurations. The composite laminate optimization was carried out through advanced numerical simulations in ANSYS Mechanical 2024 R1, combined with parametric optimization in OptiSlang 2024 R1 to achieve significant weight reduction while ensuring structural integrity. While structural optimization facilitates material savings, this work also evaluates how increased laminate design complexity influences manufacturing feasibility, production cost, and overall environmental footprint. A comprehensive Life Cycle Assessment (LCA) was conducted using Sphera GaBi and the Ecoinvent 3.9 database to quantify environmental burdens across the full product lifecycle. The findings confirm that appropriately optimized composite structures can deliver notable reductions in environmental impact and material consumption while remaining economically viable, aligning with circular economy goals focused on resource efficiency and reduced environmental burden. This contribution supports the SGEM Conference section �Recycling, Waste Management, and Circular Economy� by demonstrating how structural optimization, eco-design strategies, and performance-driven lightweighting approaches can synergistically enhance the sustainability of large-format wound composite components.

RECENT SCHOLAR PUBLICATIONS

  • Design and Simulation of Automated Pod Handling for Modular Rail-Based Transport Systems
    K Ráž, M Stejskal, WS Redakum
    Logistics 10 (4), 87 , 2026
    2026
  • Shear Performance and Numerical Simulation of Adhesively Bonded Joints in Multi-Jet Fusion 3D-Printed Polyamide Components
    F Sedlacek, M Stejskal, N Bednarova, O Spacek
    Polymers 17 (22), 3020 , 2025
    2025
    Citations: 4
  • Towards Sustainable Composite Structures: Experimental Characterisation and Damage Modelling of Unidirectional Flax Fibre-Reinforced Polymers
    M Stejskal, F Sedlacek, O Spacek, N Bednarova, J Krystek
    Polymers 17 (22), 2985 , 2025
    2025
    Citations: 1
  • Technical and regulatory challenges for the development of a new, supermodal transport system
    D Winkler, W Struckl, J König, M Osebek, M Stejskal
    2025
  • Determination of mechanical properties of blind rivet joints using numerical simulations and experimental testing
    M Beber, M Stejskal, F Sedlacek
    Materials 18 (2), 229 , 2025
    2025
    Citations: 7
  • Sport a politika by se neměly míchat? Diskuze o olympiádě v Pekingu v roce 2022
    M Stejskal
    Západočeská univerzita v Plzni , 2023
    2023
  • Optimalizace návrhu interiérových madel s využitím nových materiálů a technologií
    M Stejskal
    Západočeská univerzita v Plzni , 2023
    2023
  • Pravidla ukládání správních trestů
    M Stejskal
    Západočeská univerzita v Plzni , 2022
    2022
  • Sekundární vypružení osobních podvozků
    M Stejskal
    Západočeská univerzita v Plzni , 2021
    2021

MOST CITED SCHOLAR PUBLICATIONS

  • Determination of mechanical properties of blind rivet joints using numerical simulations and experimental testing
    M Beber, M Stejskal, F Sedlacek
    Materials 18 (2), 229 , 2025
    2025
    Citations: 7
  • Shear Performance and Numerical Simulation of Adhesively Bonded Joints in Multi-Jet Fusion 3D-Printed Polyamide Components
    F Sedlacek, M Stejskal, N Bednarova, O Spacek
    Polymers 17 (22), 3020 , 2025
    2025
    Citations: 4
  • Towards Sustainable Composite Structures: Experimental Characterisation and Damage Modelling of Unidirectional Flax Fibre-Reinforced Polymers
    M Stejskal, F Sedlacek, O Spacek, N Bednarova, J Krystek
    Polymers 17 (22), 2985 , 2025
    2025
    Citations: 1
  • Design and Simulation of Automated Pod Handling for Modular Rail-Based Transport Systems
    K Ráž, M Stejskal, WS Redakum
    Logistics 10 (4), 87 , 2026
    2026
  • Technical and regulatory challenges for the development of a new, supermodal transport system
    D Winkler, W Struckl, J König, M Osebek, M Stejskal
    2025
  • Sport a politika by se neměly míchat? Diskuze o olympiádě v Pekingu v roce 2022
    M Stejskal
    Západočeská univerzita v Plzni , 2023
    2023
  • Optimalizace návrhu interiérových madel s využitím nových materiálů a technologií
    M Stejskal
    Západočeská univerzita v Plzni , 2023
    2023
  • Pravidla ukládání správních trestů
    M Stejskal
    Západočeská univerzita v Plzni , 2022
    2022
  • Sekundární vypružení osobních podvozků
    M Stejskal
    Západočeská univerzita v Plzni , 2021
    2021