Total load-bearing capacity of yielding steel arch supports

Horyl, Petr; Maršálek, Pavel; Šňupárek, Richard; Pacześniowski, Krzysztof

doi:10.1201/9781315388502-155

Cited by 14 publications

(14 citation statements)

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“…It is necessary to mention that modeling the load-bearing capacity of structures is very difficult as it is necessary to consider the complexity of problem using an iterative solver with an unsymmetric Newton Raphson option. This topic was studied previously by the group of Horyl and Marsalek [22,23].…”

Section: Number Of Elements Number Of Nodesmentioning

confidence: 99%

Modeling and Testing of Flexible Structures with Selected Planar Patterns Used in Biomedical Applications

et al. 2020

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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.

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Section: Number Of Elements Number Of Nodesmentioning

confidence: 99%

Modeling and Testing of Flexible Structures with Selected Planar Patterns Used in Biomedical Applications

et al. 2020

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“…Our knowledge of the behaviour of different types of frictional joints during loading can contribute to the optimal design of supports. In this paper, the constructions and operation of the yielding connections are discussed based on mathematic modelling (Horyl et al, 2013). …”

Section: Introductionmentioning

confidence: 99%

Behaviour of Frictional Joints in Steel Arch Yielding Supports

Horyl¹,

Šňupárek²,

Maršálek³

2014

Archives of Mining Sciences

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BEHAVIOUR OF FRICTIONAL JOINTS IN STEEL ARCH YIELDING SUPPORTS ZACHOWANIE POŁĄCZEŃ CIERNYCH W PODATNYCH ŁUKOWYCH OBUDOWACH STALOWYCHThe loading capacity and ability of steel arch supports to accept deformations from the surrounding rock mass is influenced significantly by the function of the connections and in particular, the tightening of the bolts. This contribution deals with computer modelling of the yielding bolt connections for different torques to determine the load-bearing capacity of the connections. Another parameter that affects the loading capacity significantly is the value of the friction coefficient of the contacts between the elements of the joints. The authors investigated both the behaviour and conditions of the individual parts for three values of tightening moment and the relation between the value of screw tightening and load-bearing capacity of the connections for different friction coefficients. ANSYS software and the finite element method were used for the computer modelling. The solution is nonlinear because of the bi-linear material properties of steel and the large deformations. The geometry of the computer model was created from designs of all four parts of the structure. The calculation also defines the weakest part of the joint's structure based on stress analysis. The load was divided into two loading steps: the pre-tensioning of connecting bolts and the deformation loading corresponding to 50-mm slip of one support. The full Newton-Raphson method was chosen for the solution. The calculations were carried out on a computer at the Supercomputing Centre VSB-Technical University of Ostrava.

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“…Similar procedures were also used by Kminek et al [ 19 ]. Further practical advice on the use of FEM in complex applications can be found, e.g., in papers by the group of Horyl and Marsalek [ 20 , 21 ].…”

Section: Methodsmentioning

confidence: 99%

Study of Optimal Cam Design of Dual-Axle Spring-Loaded Camming Device

et al. 2021

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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.

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Total load-bearing capacity of yielding steel arch supports

Cited by 14 publications

References 0 publications

Modeling and Testing of Flexible Structures with Selected Planar Patterns Used in Biomedical Applications

Modeling and Testing of Flexible Structures with Selected Planar Patterns Used in Biomedical Applications

Behaviour of Frictional Joints in Steel Arch Yielding Supports

Study of Optimal Cam Design of Dual-Axle Spring-Loaded Camming Device

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