Analysis of steel tanks for water storage using shell elements

Kminek, Tomas; Maršálek, Pavel; Karásek, Tomáš

doi:10.1063/1.5114329

Cited by 4 publications

(4 citation statements)

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“…The procedures of creating stiffness matrices for used elements can be found in books by Bhatti [ 17 , 18 ]. 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: 95%

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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Section: Methodsmentioning

confidence: 95%

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

et al. 2021

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“…The least accurate and unsuitable in relation to the stability of thin-walled structures is linear elastic shell analysis (LA). The implementation of LA using a numerical model was studied by Kminek et al [12]. The most accurate results are given by geometrically and materially non-linear analysis with imperfections (GMNIA).…”

Section: Procedures For the Evaluation Of Tank Buckling Capacitymentioning

confidence: 99%

Design and Non-Linear Modeling of New Wind Girder Used for Bolted Tanks

Drahorad,

Marsalek,

Hroncek

et al. 2023

Buildings

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Large-capacity bolted cylindrical tanks for liquid storage are used in many applications. The tanks are made of thin steel sheets that are connected by bolts. A common problem associated with tanks is deforming under extreme loads. Adding wind girders to the tank increases the tank’s buckling capacity, which is defined as the limit load at which the structure loses stability. The girders are usually placed in the horizontal joints of the tank wall. The girders are bent from standard or non-standard steel bars with a uniform cross-section. This type of design is difficult to produce, especially with large profiles or large curvatures, to avoid distortion of the cross-section during bending. Furthermore, the girders are customized to the given openings and curvature for various tank diameters. The resulting solution is then uneconomical and more complicated to store. This paper deals with the design and non-linear modeling of a new shape of wind girder for bolted tanks that eliminates the above-mentioned disadvantages. To analyze the new shape of the girder, a non-linear numerical model of an open-topped tank with various dimensions is designed to study its buckling capacity.

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“…The thickness of elements was set to be outwards. The basic characteristics of the shell elements in the application are described in [21]. The number of finite elements and nodes used for models is described in the Table 3.…”

Section: Second Stage: Virtual Modeling Of Structural Stiffnessmentioning

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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Analysis of steel tanks for water storage using shell elements

Cited by 4 publications

References 0 publications

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

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

Design and Non-Linear Modeling of New Wind Girder Used for Bolted Tanks

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

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