[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.7473/EC.2021.56.3.124

Non-destructive Evaluation Method for Service Lifetime of Chloroprene Rubber Compound Using Hardness

Park, Kwang-Hwa (Reliability Assessment Center, Korea Testing & Research Institute)
Lee, Chan-Gu (Reliability Assessment Center, Korea Testing & Research Institute)
Park, Joon-Hyung (HQ of Testing Assessment, Korea Certification & Testing Institute)
Chung, Kyung-Ho (Department of Polymer Engineering, The University of Suwon)

Publication Information

Elastomers and Composites / v.56, no.3, 2021 , pp. 124-135 More about this Journal

Abstract

Evaluating service lives of rubber materials at certain temperatures requires a destructive method (typically using elongation at break). In this study, a non-destructive method based on hardness change rate was proposed for evaluating the service life of chloroprene rubber (CR). Compared to the destructive method, this non-destructive method ensures homogeneity of CR specimens and requires a small number of samples. Thermal accelerated degradation test was conducted on the CR specimens at 55, 70, 85, 100, and 125℃, and the tensile strength, elongation at break, and hardness were measured. The results of the experiment were compared to those of the accelerated life evaluation method proposed in this study. Comparing the analyzed lives in the high temperature region (70, 85, 100, and 125℃), the difference between the service lives for the destructive method (using the elongation at break) and non-destructive method (using the hardness) was approximately 0.1 year. Therefore, it was confirmed that the proposed non-destructive evaluation method based on hardness changes can evaluate the actual life of CR under thermally accelerated degradation conditions.

Keywords

thermal accelerated degradation test; arrhenius life-stress model; non-destructive method; hardness; elongation at break;

Citations & Related Records

Reference

1	W. B. Nelson, "Accelerated Testing : Statistical Models, Test Plans and Data Analysis", pp. 167-229, John Wiley & Sons, New Jersey, 2004.
2	ISO 48:2010, Rubber, vulcanized or thermoplastic -- Determination of hardness (hardness between 10 IRHD and 100 IRHD).
3	ISO 11346:2014, Rubber, vulcanized or thermoplastic -- Estimation of life-time and maximum temperature of use.
4	ReliaSoft, "Accelerated Life Testing Reference : ReliaSoft's ALTA version 7", ReliaSoft Pub., 2010.
5	D. Sung and S. Hong, "A simple method to assess replacement period of polyurethane railpad in urban railway", Const. and Buil. Mater., 248, 118607 (2020). DOI
6	D. Y. Sung and K. H. Park, "Evaluation of the degradation trend of the polyurethane resilient pad in the rail fastening system by multi-stress accelerated degradation test", J. Kor. Soci. Rail., 16, 466 (2013). DOI
7	ISO 37:2017, Rubber, vulcanized or thermoplastic -- Determination of tensile stress-strain properties.
8	H. Sameshima, K. Mitsuhashi, and S. Suga, "Correlation and acceleration of a Geer oven test to natural exposure", Polym. Tes., 24, 346 (2005). DOI
9	P. Y. Le Gac, V. Le Saux, M. Paris, and Y. Marco, "Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure", Polym. Degrad. Stab., 97, 288 (2012). DOI
10	Y. Itoh, H. Gu, K. Satoh, and Y. Kutsuna, "Experimental investigation on ageing behaviors of rubbers used for bridge bearings", J. Civ. Eng., 62, 176 (2006).
11	D. H. Stamatis, "Failure Mode and Effect Analysis : FMEA from theory to execution", pp. 125-151, American Society for Quality, Quality Press, Milwaukee, 2003.
12	Accelerated Life Testing Analysis, www.weibull.com.
13	J. Wise, K. T. Gillen, and R. L. Clough, "An ultrasensitive technique for testing the Arrhenius extrapolation assumption for thermally aged elastomers", Polym. Degrad. Stab., 49, 403 (1995). DOI
14	ISO 188:2011, Rubber, vulcanized or thermoplastic -- Accelerated ageing and heat resistance tests.