RAMS 2013 Accelerated testing for 2 year storage

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Presentation at 2013 RAMS with focus on case study of life testing for new product in storage.

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RAMS 2013 Accelerated testing for 2 year storage

  1. 1. Accelerated Testing for 2-year Storage Fred Schenkelberg OPS A LA CARTE990 Richard Avenue, Santa Clara 95054 (408)710-8248 fms@opsalacarte.com RAMS 2013
  2. 2. cylindarblock Epoxy
  3. 3. cylinderblock Activation Energy? Epoxy
  4. 4. Low MediumHigh Arrhenius model and Inverse power law model Temperature-Nonthermal Weibull model
  5. 5. cylinderblock Plate
  6. 6. cylinderblock Plate
  7. 7. Histogram of average daily temperatures 5 years of California Data *data from different study1500 90th’ile = 31°C1000 500 0 10 20 30 40 °C
  8. 8. Histogram of daily temperature range 5 years of California Data6000 *data from different study5000 90th’ile = 20.6°C4000300020001000 5 10 15 20 25 30 °C
  9. 9. Sample size & test design Sample size & test designfor thermal cycling– using for temperature – usingWasserman Success Testing Meeker Hahn monograph
  10. 10. Current Draw, TP1,2,3,4,5,6 Thermal Cycling Results 60 55 50Current Draw (mA) Current Draw over 2 years thermal cycling 45 60 40 55 35 50 Current Draw (mA) 30 45 1 2 3 4 5 6 Test Points 40 35 30 500 1000 1500 2000 Hours Intercept no significantly different than zero
  11. 11. 98.3% within specification after 2 yearswith 95% confidence
  12. 12. Current Draw 45°C Samples Temperature only data60 Aged at 45°C Current Draw50 6040 50 Current30 4020 30 TP0 TP1 TP2 TP3 TP4 TP5 20 0 10 20 30 40 Days
  13. 13. 99.4% within specification after 2 yearswith 95% confidence

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