Accelerated Testing and Screening

<p>Take action early, while changes are easy and cheap. Long before production commences. When is it most expensive to fix a problem? When customers find the problem.


  You don’t dare miss any potential failure modes, because failures can be very expensive (dollars and reputation) if missed. Today we must identify and prevent tomorrow’s problems. Accelerated life testing can save big money.


 


  25.1 You intend to prevent failures?


  25.2 Why worry about reliability?


  25.3 Commercial product marketing today


  25.4 HALT helps us to achieve field reliability


  25.5 Brief review of failures and reliability


  25.6 HALT stimulates aging


  25.7 Thermal stressing and cycling


  25.8 Random vibration


  25.9 Combining thermal + vibration stresses


  25.10 Environmental stress screening – ESS


  25.11 Highly accelerated stress screening – HASS


  25.12 Less popular stimuli


  25.13 Detecting a failure


  25.14 Can we stop screening?


  25.15 Root cause failure analysis needed


  25.16 Failure mechanisms


  25.17 Multi-axis testing and screening


  25.18 Pneumatic vibrators used for ESS


  25.19 Segmented table? Rigid table?


  25.20 Non-coherence; chaos


  25.21 Spectrum; low-frequency content


  25.22 Larger displacement offered


  25.23 Our own lab or “go outside”?


  25.24 Fluorinert transmits heat and vibration


  25.25 Acoustical excitation for screening


  25.26 Thermal ramping


  25.27 Arguments against HALT


  25.28 A few thoughts on fatigue failures


  25.29 Test time exaggeration factors


  25.30 Virtual testing


  25.31 Further study</p>

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