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

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1940 ◽  
Author(s):  
David Rybansky ◽  
Martin Sotola ◽  
Pavel Marsalek ◽  
Zdenek Poruba ◽  
Martin Fusek
Keyword(s):  
Topology Optimization ◽  
Bearing Capacity ◽  
Fall Prevention ◽  
Computational Models ◽  
Point Of View ◽  
Load Bearing Capacity ◽  
Parametric Curves ◽  
Trade Off ◽  
Cam Design ◽  
Operating Element

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.

Methodische Strukturentwicklung eines Großroboters/Research project „FlexGrind“

2021 ◽  
Vol 111 (09) ◽  
pp. 628-632
Author(s):  
Alexander Jentsch ◽  
Steffen Dryba ◽  
Christian Klötzer ◽  
Andre Siegrist ◽  
Armin Vincon
Keyword(s):  
Topology Optimization ◽  
Bearing Capacity ◽  
Structural Components ◽  
Load Bearing Capacity ◽  
Research Project ◽  
Load Bearing ◽  
Positioning Errors ◽  
Working Space ◽  
Process Forces ◽  
Processing Step

Die mechanische Nachbearbeitung von Propellergussrohlingen im Schiffbau ist ein manuell geprägter, zeitintensiver Bearbeitungsschritt. Eine Automatisierungslösung ist mithilfe eines Großroboters aufgrund seiner Tragfähigkeit und seines Arbeitsraumes möglich [1]. Um Positionsfehler und Schwingungsanfälligkeiten des Roboters durch auftretende Prozesskräfte zu vermeiden, sind hochsteife Strukturbauteile notwendig, für deren Entwicklung das Fraunhofer-Institut für Groß- strukturen in der Produktionstechnik (IGP) die Topologieoptimierung einsetzt.   The mechanical finishing of propeller casting blanks in shipbuilding is a manually characterized, time-intensive processing step. An automation solution is possible by means of a large robot due to its load-bearing capacity and working space. In order to avoid positioning errors and vibration susceptibility of the robot due to occurring process forces, highly rigid structural components are necessary, for the development of which Fraunhofer IGP uses topology optimization.

scholarly journals Topology optimization of load-bearing capacity

2021 ◽  
Author(s):  
Leyla Mourad ◽  
Jeremy Bleyer ◽  
Romain Mesnil ◽  
Joanna Nseir ◽  
Karam Sab ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Parametric study on application of Voronoi patterns in design of 2-D beams

2021 ◽  
pp. 136943322199974
Author(s):  
Salar Sehat ◽  
Alireza Khatami
Keyword(s):  
Bearing Capacity ◽  
Parametric Study ◽  
Voronoi Tessellation ◽  
Point Of View ◽  
Structural Configuration ◽  
Uniform Loading ◽  
Load Bearing Capacity ◽  
Maximum Displacement ◽  
Load Bearing ◽  
Voronoi Cells

The trend of engineering has been towards modern innovation in designs by maintaining not only the esthetic point of view but also stability and efficiency. In this regard, in this study, one of the nature-inspired structures, Voronoi tessellation, is introduced and applied as a structural configuration in the design of beams. Thus, various models of beams built with Voronoi diagrams are considered. To this end, first, the rules and regulations which govern the structure of Voronoi tessellation will be presented. Then various stages of generating the geometry of Voronoi beams will be described in detail. Considering the logical architectural requirements, the presented models are prepared as 2D-beams with different degrees of uniformity comprising the minimum and maximum Voronoi cells, which will be designed according to guidelines. In the next step, uniform loading under different boundary conditions will be applied to all Voronoi beams, and the results including structural weight, maximum displacement, and load-bearing capacity will be presented. The results of beams designed with Voronoi structures reveal that increasing the size of minimum cell will result in the rise of the maximum displacements as well as load-to-weight ratios and considerably reduce the weight of Voronoi beams but demonstrate sufficient load-bearing capacity. It also proves that as the non-uniformity of cells increases, displacements will grow. In addition, although the weight of samples will reduce, the load-to-weight ratios of the archetypes remain almost constant. Placing more supports for these structures will lead to an improvement in all aspects of design, especially on the response of beams with large spans.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

scholarly journals The energy absorption behavior of novel composite sandwich structures reinforced with trapezoidal latticed webs

2021 ◽  
Vol 60 (1) ◽  
pp. 503-518
Author(s):  
Juan Han ◽  
Lu Zhu ◽  
Hai Fang ◽  
Jian Wang ◽  
Peng Wu
Keyword(s):  
Bearing Capacity ◽  
Energy Absorption ◽  
Sandwich Structure ◽  
Ultimate Load ◽  
Sandwich Structures ◽  
Elastic Displacement ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Composite Sandwich ◽  
Composite Sandwich Structures

Abstract This article proposed an innovative composite sandwich structure reinforced with trapezoidal latticed webs with angles of 45°, 60° and 75°. Four specimens were conducted according to quasi-static compression methods to investigate the compressive behavior of the novel composite structures. The experimental results indicated that the specimen with 45° trapezoidal latticed webs showed the most excellent energy absorption ability, which was about 2.5 times of the structures with vertical latticed webs. Compared to the traditional composite sandwich structure, the elastic displacement and ultimate load-bearing capacity of the specimen with 45° trapezoidal latticed webs were increased by 624.1 and 439.8%, respectively. Numerical analysis of the composite sandwich structures was carried out by using a nonlinear explicit finite element (FE) software ANSYS/LS-DYNA. The influence of the thickness of face sheets, lattice webs and foam density on the elastic ultimate load-bearing capacity, the elastic displacement and initial stiffness was analyzed. This innovative composite bumper device for bridge pier protection against ship collision was simulated to verify its performance. The results showed that the peak impact force of the composite anti-collision device with 45° trapezoidal latticed webs would be reduced by 17.3%, and the time duration will be prolonged by about 31.1%.

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