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7. PRODUCT LIFECYCLE TESTING METHODS 16 7.1 Accelerated Life Testing 16 7.1.1 Overview 16 7.1.2 Qualitative ALT 16 7.1.3 Quantitative ALT 16 7.2 Highly Accelerated Life Testing 17 7.2.1 Approach 17 7.2.2 Failure Analysis 17 7.2.3 Corrective Action Verification 18 7.2.4 Database Management 18 7.2.5 Test Processes/Procedure 18 8. STRESS SCREENING METHODS 20 8.1 Highly Accelerated Stress Screening 20 8.1.1 Overview 20 8.1.2 Approach 20 8.1.3 Precipitation 20 8.1.4 Detection 20 8.1.5 Failure Analysis 21 8.1.6 Corrective Action Verification 21 8.1.7 Database Management 21 8.2 Environmental Stress Screening 21 8.2.1 Overview 21 9. PHYSICS OF FAILURE 22 9.1 Mechanical PoF Approach 23 9.1.1 The Dynamics Modeling Process 23 9.1.2 Finite Element Method 23 9.1.3 Fatigue and Fracture 24 9.1.4 Testing 25 9.2 Electronic PoF Approach 26 9.2.1 Operational Environment 26 9.2.2 Software 27 9.2.3 Modeling the CCA 27 9.2.4 Modal and Random Vibration Response Analysis 27 9.2.5 Thermal Overstress Analysis 27 9.2.6 Shock Response and Survivability Assessment 27 9.2.7 Vibration Fatigue Life Assessment 27 9.2.8 Thermal Fatigue Life Assessment 28 9.2.9 Combined Fatigue Life Assessment 28 9.2.10 Design to Reduce Vibration/Shock Failures 28 9.2.11 Design to Reduce Temperature Cycling Failures 30 9.2.12 Design to Reduce Thermal Overstress Failures 31 9.3 Summary 32 10. SOFTWARE-IN-SYSTEMS RELIABILITY 33 iv

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