Highly Accelerated Life Testing (HALT) is a process for ruggedization of preproduction products. It is also referred to as AST (Accelerated Stress Testing).
Highly Accelerated Stress Screening (HASS) is the production screen for products once they have been characterized in HALT.
HALT and HASS each use very high rate of change temperature chambers which are combined with multi-axis pneumatic vibration systems.
Slides: HALT/HASS for Product Reliability: HALT_HASS.pptx
See also: Environmental Stress Screening (ESS) for Product Reliability: ESS.pptx
* * *
A function for synthesizing a rough approximation of a HALT/HASS acceleration time history (repetitive shock) is included in:
Matlab script: Vibrationdata Signal Analysis Package
The function can be accessed via:
>> vibrationdata > Miscellaneous > generate > HALT/HASS simulation
The Matlab script also has a function for thermal & vibration screen strengths
>> vibrationdata > Miscellaneous > ESS Screening Strengths
* * *
Reference:
United States Army, Belvoir Research, Development & Engineering Center, ESS Guide
* * *
The fatigue damage spectrum (FDS) can be used to characterize HALT/HASS severity.
See:
Fatigue Damage Spectrum – A New Tool to Accelerate Vibration Testing
Correlating HALT & HASS, RS/HALT Vibration and End-Use Environments
* * *
– Tom Irvine
2 thoughts on “HALT/HASS for Product Reliability”