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原文传递 Diffusion Limited Oxidation (DLO) Modeling of Tires During Oven Aging.

题名：	Diffusion Limited Oxidation (DLO) Modeling of Tires During Oven Aging.
作者：	E. R. Terrill; M. Centea; A. Pannikottu; U. Karmarkar; L. R. Evans;
关键词：	tires,aging tests,service life;rubber, elastomers, accelerated tests, oxidation, vehicle safety;truck tires, diffusion limited oxidation
摘要：	This report is the sixth in a series of scientific reports intended to provide an understanding of the chemical reactions responsible for the degradation of light vehicle tires during on-vehicle service. The report series was used to guide the agency's development of a laboratory-based accelerated service life test for light vehicle tires (i.e., 'tire aging test'). Oven aging tires at 55 to 65 degrees C, while pressurized with an oxygen-rich inflation gas, has been identified as the primary candidate for a tire aging test. However, the agency was cautioned that the level of oxygen required for reactions within the tire rubber at the higher oven temperatures could exceed the supply of the oxygen diffusing to the rubber components, resulting in an effect termed Diffusion Limited Oxidation (DLO). DLO could result in the outermost layers of the tires experiencing anaerobic (without oxygen) reactions that are not representative of what light vehicle tires experience during normal service. To explore these concerns, the oxidation rates in the shoulder region of twenty four tire models were predicted at two temperatures (55 degrees C and 65 degrees C) using a computer model. To confirm simulation results, chemical and physical property data was taken from the shoulder region of the tire models before and after actual oven aging at the same conditions as were simulated by the computer model. The computer simulations predicted that none of the tires would experience DLO at 55 degrees C oven aging, and conversely that all of the shoulder regions would experience some DLO at 65 degrees C, especially in the tread of light truck tires. / Title Note: Final rept. / Supplementary Notes: Sponsored by National Highway Traffic Safety Administration, Washington, DC. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A05 / NTIS In-house Control Codes: dothts;12091,1101
报告类型：	科技报告