New methods for predicting lifetimes. Part 2 -- The Wear-out approach for predicting the remaining lifetime of materials

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The so-called Palmgren-Miner concept that degradation is cumulative, and that failure is therefore considered to be the direct result of the accumulation of damage with time, has been known for decades. Cumulative damage models based on this concept have been derived and used mainly for fatigue life predictions for metals and composite materials. The authors review the principles underlying such models and suggest ways in which they may be best applied to polymeric materials in temperature environments. The authors first consider cases where polymer degradation data can be rigorously time-temperature superposed over a given temperature range. For a step change ... continued below

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38 p.

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GILLEN,KENNETH T. & CELINA,MATHIAS C. April 20, 2000.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 17 times . More information about this report can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The so-called Palmgren-Miner concept that degradation is cumulative, and that failure is therefore considered to be the direct result of the accumulation of damage with time, has been known for decades. Cumulative damage models based on this concept have been derived and used mainly for fatigue life predictions for metals and composite materials. The authors review the principles underlying such models and suggest ways in which they may be best applied to polymeric materials in temperature environments. The authors first consider cases where polymer degradation data can be rigorously time-temperature superposed over a given temperature range. For a step change in temperature after damage has occurred at an initial temperature in this range, they show that the remaining lifetime at the second temperature should be linearly related to the aging time prior to the step. This predicted linearity implies that it may be possible to estimate the remaining lifetime of polymeric materials aging under application ambient conditions by completing the aging at an accelerated temperature. They refer to this generic temperature-step method as the Wear-out approach. They then outline the expectations for Wear-out experiments when time-temperature superposition is invalid, specifically describing the two cases where so-called interaction effects are absent and are present. Finally, they present some preliminary results outlining the application of the Wear-out approach to polymers. In analyzing the experimental Wear-out results, they introduce a procedure that they refer to as time-damage superposition. This procedure not only utilizes all of the experimental data instead of a single point from each data set, but also allows them to determine the importance of any interaction effects.

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38 p.

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OSTI as DE00754007

Medium: P; Size: 38 pages

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  • Other Information: PBD: 20 Apr 2000

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  • Report No.: SAND2000-0715
  • Report No.: 0000034887-000
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/754007 | External Link
  • Office of Scientific & Technical Information Report Number: 754007
  • Archival Resource Key: ark:/67531/metadc710555

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  • April 20, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 12, 2017, 2:35 p.m.

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GILLEN,KENNETH T. & CELINA,MATHIAS C. New methods for predicting lifetimes. Part 2 -- The Wear-out approach for predicting the remaining lifetime of materials, report, April 20, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710555/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.