Exact determination of the global tip deflection of both close-coiled and open-coiled cylindrical helical compression springs having arbitrary doubly-symmetric cross-sections

Yıldırım, Vebil

doi:10.1016/j.ijmecsci.2016.06.022

Cited by 15 publications

(13 citation statements)

References 58 publications

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“…It was verified that the characteristics of the acquired spring also respected the previously established restrictions. Furthermore, it was observed that the purchased spring was stronger than the first spring idealized; as it presented less number of coils, smaller mean diameter and greater wire diameter, as also observed in Yıldırım (2016) studies with helical springs. Finally, it was noticed that there was an increase in the spring rate (0.30 N.m -1 ), since the maximum deflection of the purchased spring was smaller than the maximum deflection of the first calculated spring, the second one must have had a higher unitary capacity of power storage.…”

Section: Resultsmentioning

confidence: 56%

“…In order to design the coil torsion springs an electronic spreadsheet model created from equations 4, 5, 6, 7, 8, and 9 was implemented. These equations are adaptations of HOOKE's law (1678) and were also used by several authors (Pöllänen & Martikka, 2010;Choi & Choi, 2015;Yıldırım, 2016) when studying the behavior of torsion springs in a wild variety of applications. The model was solved with the help of Solver (Excel ™ Add-in) software package, mentioned by a number of authors (Dasgupta, 2008;Arif et al, 2012;Ishizu & Yamada, 2017) as a great auxiliary tool for optimizing nonlinear problems involving multiple variables.…”

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confidence: 99%

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Coil Spring for Torque Reduction in Tractor Foldable Rops

Araújo¹,

Teixeira

Voltarelli

et al. 2018

Eng. Agríc.

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Studies conducted by the international labor organization have shown that operations involving agricultural machinery are among the three activities with the highest risk of accidents to workers. Among the possible causes, rollover is the most common, accounting for 33% of fatal accidents. Despite this, there are standards that provide for the use of safety devices to ensure the physical integrity of the operator, among these equipment stand out rollover protection structures, which can be foldable or not. In this sense, the objective of this study was to perform an ergonomic study in order to analyze the torque required for lowering and lifting a foldable rollover protection structure attached to an agricultural tractor, developing instrumentation for validation of the efforts required to operate the structure and comparing the results obtained with the values recommended by the Standard (CODE 6-OECD). When torque values were above those recommended by the standard, a set of torsion springs was used as solution to torque reduction. After further testing, the effectiveness of the solution was verified. Furthermore, it was observed that the angular speed of the bar does not have a significant influence on the torque required to lift the bar.

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Section: Resultsmentioning

confidence: 56%

mentioning

confidence: 99%

Coil Spring for Torque Reduction in Tractor Foldable Rops

Araújo¹,

Teixeira

Voltarelli

et al. 2018

Eng. Agríc.

View full text Add to dashboard Cite

show abstract

“…Dynamic behaviour of isotropic and homogeneous helical springs has been widely studied in the past decades [1,[7][8][9][10][11][12], there are no in depth studies on the dynamic behaviour of a corroded suspension spring. For the corroded spring, the design formulas for helical compression springs are no longer suitable.…”

Section: Fig 1 Force-displacement Curve Of a Suspension Springmentioning

confidence: 99%

A finite element and experimental analysis of durability tested springs

2018

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Ageing of vehicles has become a major concern as the vehicles reach the end of their original design life. Corrosion is part of long-term ageing and forms one of the critical degradation processes affecting the mechanical properties, such as stiffness, affecting the structural integrity and life of key components. In this study, a finite element and experimental analysis was carried out to investigate the response of corroded springs in relation to the morphology of a corroded surface. An FE model was created using ABAQUS that correlates the stiffness changes with ageing. The analysis of corrosion-induced stress is then performed to determine the stress fields within the corrosion region. The durability tested springs were analysed with a microscope to identify the morphology of corrosion pits; the measured pattern was adopted in the subsequent FE simulations. A spring test machine was employed to perform the mechanical tests. The load-deflection behaviour of durability tested springs was recorded and then was used to validate the FE simulations.

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“…Under a static axial force, for the determination of the vertical tip deflection of cylindrical helical compression springs with any closed section having double symmetry axes the following equation is proposed by Yıldırım (2012Yıldırım ( , 2016 and Haktanır (1994).…”

Section: Determination Of the Global Tip Deflection Of The Spring Undmentioning

confidence: 99%

“…Validity of this algorithm for even the springs with initial static loads is demonstrated. To determine the geometrical configuration of the spring subjected to a static axial force, an analytical expression taking into account for the whole effect of the stress resultants such as axial and shearing forces, bending and torsional moments is used (Yıldırım, 2012(Yıldırım, , 2016. The present natural frequencies obtained by the method described above are then compared with the available literature.…”

Section: Introductionmentioning

confidence: 99%

Axial Static Load Dependence Free Vibration Analysis of Helical Springs Based on the Theory of Spatially Curved Bars

Yıldırım¹

2016

Lat. Am. j. solids struct.

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This work addresses an accurate and detailed axial static load dependence linearly elastic free vibration analysis of cylindrical helical springs based on the theory of spatially curved bars and the transfer matrix method. For a continuous system, governing equations comprise coupled vibration modes namely transverse vibrations in two orthogonal planes, torsional and axial vibrations. The axial and shear deformation effects together with the rotatory inertia effects are all considered based on the first order shear deformation theory and their effects on the frequencies are investigated. The effects of the initial stress resultants on the frequencies are also studied. After buckling, forward-shifting phenomenon of higher frequencies is noticeably demonstrated. It is also revealed that a free/forced vibration analysis with an axial static load should not be performed individually without checking buckling loads.

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Exact determination of the global tip deflection of both close-coiled and open-coiled cylindrical helical compression springs having arbitrary doubly-symmetric cross-sections

Cited by 15 publications

References 58 publications

Coil Spring for Torque Reduction in Tractor Foldable Rops

Coil Spring for Torque Reduction in Tractor Foldable Rops

A finite element and experimental analysis of durability tested springs

Axial Static Load Dependence Free Vibration Analysis of Helical Springs Based on the Theory of Spatially Curved Bars

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