[ Article ]

Journal of the Korean Society of Manufacturing Technology Engineers - Vol. 27, No. 1, pp.7-13

ISSN: 2508-5107 (Online)

Print publication date 15 Feb 2018

Received 11 Dec 2017 Revised 03 Jan 2018 Accepted 12 Jan 2018

DOI: https://doi.org/10.7735/ksmte.2018.27.1.7

고온 열화 고무의 응력 완화를 이용한 가속 수명 평가

오성훈^a ; 김홍석^b ; 정성균^b ; 신기훈^b^{, *}

Evaluation of Accelerated Life of High-temperature Deteriorated Rubber by Stress Relaxation

Sunghun Oh^a ; Hong Seok Kim^b ; Seong-Kyun Cheong^b ; Ki-Hoon Shin^b^{, *}

aDept. of Mechanical Engineering, Graduate School of Seoul National University of Science and Technology, 232, Gongneung-ro, Nowon-gu, Seoul 01811, Korea
bDept. of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, 232, Gongneung-ro, Nowon-gu, Seoul 01811, Korea

Correspondence to: ^*Tel.: +82-2-970-6320, Fax: +82-2-949-1458, E-mail address: shinkh@seoultech.ac.kr (Ki-Hoon Shin).

Abstract

Rubber materials are indispensable in various industrial environments. However, it is very difficult to predict the physical properties and life of rubber materials depending on their usage environment. Physical properties begin to deteriorate owing to chemical changes even when rubber materials are not used. Despite this deterioration, they can be used within a range that does not impair safety or performance. In this study, rubber specimens made of NR65 natural rubber were first deteriorated at 80°C for one week and one month, respectively. Next, the stress relaxations of three groups of specimens were observed at various elongation conditions (50%, 100%, and 150%). An inverse power model for predicting life was derived from the experimental results. Finally, life at a relatively low elongation condition (30%) was predicted and validated by comparison.

Keywords:

Life of rubber materials, Deterioration, Stress relaxation, NR65 natural rubber

Acknowledgments

이 논문은 국토교통과학기술진흥원에서 시행하는 철도기술연구사업(17RTRP-B084184-04)의 일환으로 수행되었습니다.

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