전동차용 세브론 고무스프링 특성 및 사용수명 평가
Characteristics and Useful Lifetime Evaluation of Chevron Rubber Spring for Electric Locomotives
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초록
전동차량의 1차 현가장치로 사용되는 세브론 고무스프링의 특성과 사용수명을 예측하고 평가하는 기술은 안전성과 신뢰성을 확보하기 위해 매우 중요하다 하겠다. 변형률 에너지함수로 정의되는 고무소재의 비선형 물성은 세브론 고무스프링의 해석과 설계에 중요한 변수로 단축인장, 등 이축인장 및 순수전단시험을 통해 결정하였으며, 전산해석을 통해 세브론 고무스프링의 특성을 예측하고 평가하였다. 또한, 유한요소 해석과 피로시험을 통해 취약부위에서의 최대 그린-라그랑지 변형률을 이용하여 가황고무 소재의 사용수명 예측방법을 제안하였다. 제안된 방법에 의해 예측된 세브론 고무스프링의 사용수명은 피로시험을 통해 얻어진 수명과 잘 일치함을 알 수 있었다.
Abstract
Chevron rubber springs is used in primary suspension system for electric locomotives. Characteristics and useful lifetime prediction and evaluation of chevron rubber spring were very important in design procedure to assure the safety and reliability. Non-linear properties of rubber material which are described as strain energy function was important parameter to design and analysis of chevron rubber spring. These are determined by mechanical tests which are uni-axial tension, equi-biaxial tension and pure shear test. The computer simulation was execute to predict and evaluate the characteristics for chevron rubber spring. Also, Useful lifetime prediction methodology of vulcanized natural rubber was proposed by incorporating the finite element analysis and fatigue damage parameter of maximum Green-Lagrange strains appearing at the critical location determined from fatigue test. Predicted useful lifetime of the chevron rubber spring showed a fairly good agreement with the experimental useful lifetime.
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