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Development of an Engineering Analysis Tool for Time-Temperature Analysis of Automotive Components
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
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This paper describes the development of an engineering analysis tool that assesses the life of vehicle components, after exposure to heat.
As a standard engineering practice, each component or part of a component has a “long term” and a “short term” temperature goal based on the part’s material physical properties. At higher temperatures, component’s physical properties degrade at a faster rate, and the component’s useful life can be significantly reduced. The extent of degradation depends upon the duration of exposure, the magnitude of the over-temperature and rate of thermal degradation.
This tool utilizes actual vehicle test data from test cells or road testing, material physical properties, and expected vehicle duty cycle to determine the expected component life. When component temperature goals are exceeded, the software calculates the total duration of time above the goal temperature.
Kinetic degradation models [1–2] (which utilize the material’s activation energy value and Arhenius’ kinetic model) are used to calculate the component’s Equivalent Exposure Time (EET) using equation (1) at each temperature over-goal. The model then utilizes the component’s thermal duty cycle (based on the vehicle’s operating duty cycle) and the calculated (EET) values to calculate the component’s total thermal exposure during the vehicle’s lifetime (150,000 miles). The tool then uses these results for a final (Pass or Fail) assessment of the component.
CitationEl-Sharkawy, A., Woronowycz, G., Luibrand, E., Nixon, G. et al., "Development of an Engineering Analysis Tool for Time-Temperature Analysis of Automotive Components," SAE Technical Paper 2009-01-1179, 2009, https://doi.org/10.4271/2009-01-1179.
- El-Sharkawy, A. E. “Application of Kinetics of Thermal Degradation for Time-Temperature Analysis of Automotive Components” SAE Paper # 2009-01-1178
- Seferis, J. C. “Aging Analyses of Polymer Composites through Time-Temperature Equivalence,” Journal of Composites Technology and Research, JCTRER 21 3 July 1999 173 179
- El-Sharkawy, A. E. “Determination of Proper Test Conditions for Automotive Thermal Protection” SAE Paper # 2006-01-1572
- Bolland JL Kinetic studies in the chemistry of rubber and related materials I. The thermal oxidation of ethyl linoleate Proc R Soc London 1946 A186 218
- Bateman L Gee G Morris AL Watson WF The velocity coefficients of the chain propagation and termination reactions in olefin oxidations in liquid systems Discuss Faraday Soc 1951 10 250
- Wise J Gillen KT Clough RL An ultrasensitive technique for testing the Arrhenius extrapolation assumption for thermally aged elastomers Polym Degrad Stab 1995 49 403
- Gillen KT Celina M Keenan MR Methods for predicting more confident lifetimes of seals in air environments Rubber Chem Technol 2000 73 265
- Gillen KT Celina M Bernstein R Validation of improved methods for predicting long-term elastomeric seal lifetimes from compression stress-relaxation and oxygen consumption techniques Polym Degrad Stab 2003 82 25
- Gillen KT Celina M Bernstein R Review of the ultrasensitive oxygen consumption method for making more reliable extrapolated predictions of polymer lifetimes Ann Tech Conf Soc Plast Eng 2004 62 2289
- Gillen KT Bernstein R Celina M Non-Arrhenius behaviour for oxidative degradation of chlorosulfonated polyethylene materials Polym Degrad Stab 2005 87 335
- Celina M Graham AC Gillen KT Assink RA Minier LM Thermal degradation studies of a polyurethane propellant binder Rubber Chem Technol 2000 73 678