Fig. 1. A diagram of gas regulator [11].
Fig. 2. Selected Samples.
Fig. 3. Manufactured test specimen.
Fig. 4. SEM micrographs of diaphragm samples with a magnification of 500 x.
Fig. 5. SEM images of both D new and D 25 samples with a magnification of 250 x.
Fig. 6. Changes of stress by strain percentage for different service periods of diaphragms.
Fig. 7. Reduction percentage in tensile strength according to the service periods of diaphragms.
Fig. 8. Elongation percentage according to the service periods of diaphragms.
Table 1. Annual distribution of diaphragm samples used in this study
References
- Korea Gas Safety Corporation, "2016 Yearbook of Gas Accident", pp. 32-118, (2017)
- Lee, S. W., "A study on the Gas-Proof Features of Diaphragm of the Gas Pressure Regulator", Master thesis, Seoul National University of Technology, Seoul, pp. 37-38, (2007)
- Kim, Y. G., and Kwon, J. R., "Aging Characteristics of Low Pressure LPG Regulators for Domestic Use", KIGAS, 3(1), 58-63, (1999)
- Kim, Y. G., Cho, S. B. and Kim, P. J., "Evaluation of Performance and Service Life of Low Pressure LPG Regulators for Home Use", Energy Engineering, 15(1), 23-27, (2006)
- Shin, Y. I., Park, H. W., Lee, Y. J., Kim, G. B., Song, J. H., Chang, Y. J., and Jeon, C. H., "An Experimental Study on the Diaphragm Deflection Characteristic of a Hydrogen Diaphragm Compressor", Trans. of the Korean Hydrogen and New Energy Society, 20(4), 274-282, (2009)
- Moon, H. I., "A Study on Permanent Deformation and Endurance Life of Rubber Components", PhD thesis, Kangwon National University, Kangwon, 163-169, (2011)
- Meera, A. P., Said, S., Grohens, Y., Luyt, A. S., and Thomas, S., "Tensile Stress Relaxation Studies of TiO2 and Nanosilica Filled Natural Rubber Composites", Industrial & Engineering Chemistry Research, 48(7), 3410-3416, (2009) https://doi.org/10.1021/ie801494s
- Oman, S., and Nagode, M., "Observation of the Relation Between Uniaxial Creep and Stress Relaxation of Filled Rubber", Materials and Design, 60, 451-457, (2014) https://doi.org/10.1016/j.matdes.2014.04.036
- Yang, Y. L., Qiao, L., Wang, C., Lu, F., and Kang, X. H., "Effect Analysis, of Temperature on the Rubber Material Stress-strain Relationship", Advanced Materials Research, 977, 116-119, (2014) https://doi.org/10.4028/www.scientific.net/AMR.977.116
- Woo C. S., Park, H. S., Yang, S. C., Jang, S. Y., and Kim, E., "Lifetime Prediction of Rubber Pad for High Speed Railway Vehicle", Trans. of Korean Society of Mechanical Engineers A, 33(8), 739-744, (2009) https://doi.org/10.3795/KSME-A.2009.33.8.739
- Https://www.elster-americanmeter.com
- Korean Agency for Technology and Standards, "KS M 6518, Vulcanized rubber physical test method", 4-5, (2016)