Determination of the Properties of the Rubber Mounted Under the Agricultural Tractor Rollover Protective Structure Cabin
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Online ISSN 2234-1862 Print ISSN 1738-1266
ORIGINAL ARTICLE
Determination of the Properties of the Rubber Mounted Under the Agricultural Tractor Rollover Protective Structure Cabin Using a Hyperelastic Tensile Test and Finite Element Analysis Ho-Sung Song 1 & Yu-Yong Kim 1 Received: 21 May 2020 / Revised: 7 August 2020 / Accepted: 9 August 2020 # The Korean Society for Agricultural Machinery 2020
Abstract Purpose This study was carried out to determine the properties of materials used in the rubber mounted under the agricultural tractor rollover protective structure cabin. Methods The natural rubber specimens were subjected to a hyperelastic uniaxial, biaxial, and planar tensile test, and a volumetric compression test for each of the four shore hardness types. The validity of the properties was assessed using ABAQUS, a commercial finite element analysis program. Result As a result of measuring the stress-strain curve with five repetitions of loading-unloading within each strain range, it was observed in all test results that the stress gradually eased from the initial level as the number of load iterations and strain intervals increased. Conclusion The nominal tensile stress was shown in the order of uniaxial, planar, and biaxial tensile test. The nonlinear material models were similar to the tensile test results, and the Ogden 3rd model showed the best performance. Keywords Agricultural tractor . Finite element analysis . Rollover protective structure . Rubber mount
Introduction The rollover protective structure (ROPS) of the agricultural tractor is a safety device designed to protect the driver from a rollover or fall in one of the most dangerous types of tractorrelated accidents caused by negligence. Many countries in the world make it mandatory that tractors have the ROPS certified under the international test standards installed to protect drivers. Currently, Korea is assessing the safety of tractor protective structures by physical means according to the international test standards, with large deformations occurring in general. Since tests following the OECD code cost a tremendous amount of money and time, the OECD is currently preparing a simulation to assess the safety of protective structures through finite element analysis. The ROPS cabin is fitted with rubber mounts at the tractor joints to reduce vibration and the resulting driver’s fatigue that it * Yu-Yong Kim [email protected] 1
National Institute of Agricultural Sciences, Jeonju, Jeonbuk 54875, South Korea
causes (Choi and Lee 2018). The ROPS is a structure to protect the driver. The ROPS should not be deformed and over the safety boundary due to the rollover of the tractor. The rubber mounted under the ROPS may significantly affect the overall deformation of the ROPS and may invade the safety boundary. Unlike the rigid body, the rubber becomes hardened with loading and stretching, creating a nonlinear stress-strain. If the physical properties of rubber are not properly considered when conducting finite element analysis, the deformation of th
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