Reliability

Which thermodynamics-based model expresses lifetime acceleration including the effects of multiple stresses such as humidity and voltage in addition to temperature?

  1. AThe Poisson model
  2. BOhm's law
  3. CThe Eyring model
Show answer and explanation

Answer: C. The Eyring model

The Eyring model multiplies the Arrhenius temperature term by terms for stresses such as humidity, voltage and current, expressing lifetime acceleration under multiple stresses. It is used to estimate lifetime under real usage from results such as temperature-humidity-bias tests.

  • A. The Poisson model is used for yield calculations and similar.
  • B. Ohm's law relates voltage, current and resistance.
  • C. Correct. It is an acceleration model including multiple stresses.
Practice this topic Back to topic

More Reliability questions

  1. Which model expresses the fatigue life of solder joints under temperature cycling as a relationship between the temperature swing (strain magnitude) and the number of cycles?
  2. Which statistical distribution is commonly used to describe the times to failure of many wires in electromigration life tests?
  3. In automotive and similar applications, what is the summary called of which temperature, voltage and operating-time conditions a product will be exposed to over its lifetime?
  4. If 10,000 parts with a failure rate of 100 FIT are used for one year (about 8,760 hours), which is closest to the expected number of failures? (1 FIT = 1 failure per 10⁹ hours)
  5. On printed circuit boards and similar, what is the phenomenon called in which, under humid conditions, metal (such as silver or copper) dissolves as ions between biased electrodes, migrates and deposits in tree-like forms, causing a short?