Optimizing Environmental Stress Screening (ESS)
(ESS 501)
Vibration Excitation Types
- Sine Sweep and Sine Dwell
- Random
- Natural Mode Response
- Distribution of vibration test responses
- Isolation
- Circuit card natural response - frequencies and shapes
Fatigue discussion
- S-N Curve
- Low and high cycle fatigue
- Curve Slope
- Stress / life relationship
- Damage method
- Demonstration of fatigue damage calculation
- Damage contributions - damage rates for excitation types
- Random response and damage distributions - material property effects
- Circuit Cards properties and tolerances - effect on vibration life capability
- Accelerated life testing - equivalent damage discussion
HALT - effective step stress testing - Do's / Don'ts
ESS - screen effectiveness - unit input control
- Response
- Component positions
- ESS optimization
- Determining screen effectiveness for potential flaws
Example applications of PoF vibration methods
Design of experiments - shaker, fixture, axes of vibration
Avoiding blind application of guidelines, rules, buzz words / phrases
PoF analysis, test comparison
PoF analysis methods throughout the electronics development process
Course summary
Award of certificates
