Tools › Reliability

Reliability

10 tools in 6 sections. Each tool page shows the method with the numbers substituted, its references and the published examples it reproduces.

Life Data 2

  • Weibull Life Analysis Life-data analysis of failure times with suspensions (units still running or removed unfailed): the two-parameter Weibull fitted by median-rank regression (Johnson's…
  • Accelerated Life Accelerated life test data analysis: failure and suspension times pasted by stress level are fitted jointly by maximum likelihood to a life-stress model (Arrhenius with…

System Models 2

  • System Reliability Reliability of a system from its reliability block diagram: components listed one per line with an exponential (failure rate or MTBF), Weibull (shape, scale) or fixed…
  • Fault Tree Analysis Qualitative and quantitative fault tree analysis of a tree typed as text: gates as OR(...), AND(...), k-of-n voting gates such as 2of3(...), NOT and XOR, basic events…

Growth and Testing 2

  • Reliability Growth Reliability growth tracking of a development test from the cumulative failure times, from interval counts or from several systems on their own clocks: the Duane plot…
  • HALT and HASS Planning Two planning tools for environmental stress screening of electronic hardware. The HALT part takes the operating and destruct limits found in a highly accelerated life…

Physics of Failure 2

  • Solder Joint Fatigue Thermal-cycling fatigue life of surface-mount solder joints by the Engelmaier-Wild creep-fatigue model in the form of IPC-SM-785: the cyclic shear strain range from the…
  • PCB Vibration and Thermal Cycling Fatigue Vibration fatigue screening of a printed circuit board assembly by the Steinberg relations as mathematics: the board's fundamental frequency from the plate formula with…

Maintainability and Availability 1

  • Maintainability and Availability Maintainability and availability of a repairable system from its maintenance tasks: each task carries a failure rate or MTBF, a repair-time distribution (lognormal,…

Safety Analysis 1

  • Hazard and Safety Analysis Three system-safety calculations under one select. A hazard log assessed by MIL-STD-882E: each hazard's severity category (1 to 4) and probability level (A to F, or a…