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최병규(Byounggyu Choi),허민혁(Minhyuk Heo),서창만(Changman Seo),권혜린(Hyerin Kwon),김광훈(Kwanghoon Kim),박성훈(Seonghun Park) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Automotive weatherstrips are made of rubber with nonlinear hyperelastic properties, and it is difficult to express properties by a mathematical model. Therefore, in order to design the door weatherstrip, it is necessary to accurately identify the properties of the rubber and find a suitable mathematical model. The purpose of this study is to select a hyperelastic mathematical model suitable for automotive weatherstrip rubber to improve the accuracy and reliability of the design. A hyperelastic mathematical model was constructed using uniaxial tensile and compression test data of rubber and applied to nonlinear finite element analysis. A 100 mm weatherstrip compression test was performed and compared with the finite element analysis results. There is a difference in the accuracy of the hyperelastic model depending on the strain range, and the strain range should be considered when selecting the model. The weatherstrip used in the analysis showed a strain of 0.5 or less, and the Yeoh model is the most suitable model at low strain.
최병규(Byounggyu Choi),허민혁(Minhyuk Heo),서창만(Changman Seo),권혜린(Hyerin Kwon),김광훈(Kwanghoon Kim),박성훈(Seonghun Park) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Automotive weatherstrips made of rubber material have nonlinear hyperelastic/viscoelastic properties and it is difficult to design accurately reflecting their properties. Therefore, it is necessary to present a mathematical model suitable for accurate rubber behavior to design the weatherstrip. The purpose of this study is to find the hyperelastic/viscoelastic mathematical model for the rubber material of automotive weatherstrips and to apply this model to the computational analysis in order to improve the accuracy and reliability of the static and dynamic analyses during door closing. Uniaxial tensile/compressive tests and DMA (Dynamic Mechanical Analysis) tests were used to construct a mathematical model. Compression tests using a 100 mm weatherstrip sample were also carried out to verify the computational results. The maximum strain of the automotive door weatherstrip was found to be as low as 0.5 or less through the finite element analysis when the automotive door was closed. Computational compressive load deflection (CLD) results of the weatherstrip using several hyperelastic models were compared with weatherstrip test results and an accurate material model for low strain range was selected. The viscoelastic model was also added to the selected model to confirm the stress relaxation over time. When only uniaxial tensile test data were used, the Form model combined with the viscoelastic Prony series was the most suitable model to express the nonlinear viscoelastic behavior of the rubber at low strain range.