Accelerated Life Testing Reference

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Introduction

• Introduction
• Modifications and Enhancements to ALTA
• How is this Online Reference Arranged?
• Contents

• What is Accelerated Life Testing?
• Types of Accelerated Tests
• Quantitative Accelerated Life Tests

Understanding Quantitative Accelerated Life Test Analysis

• Understanding Quantitative Accelerated Life Data Analysis
• Looking at a Single Constant Stress Accelerated Life Test
• Life Distribution and Life-Stress Models
• Analysis Method
• Stress Loading
• Summary of Accelerated Life Testing Analysis

• Accelerated Life Testing and ALTA
• Data and Data Types
• Plots
• Probability Plots
• Reliability/Unreliability Plots
• Failure Rate Plots
• pdf Plots
• Life-Stress Plots
• Standard Deviation Plots
• Acceleration Factor Plots
• Residual Plots
• Standardized Residuals Plots
• Cox-Snell Residuals Plots
• Standardized vs. Fitted Values Plots

Life Distributions

• Life Distributions
• Exponential Distribution
• Characteristics of the 1-parameter Exponential Distribution
• Calculating the Parameter of the Exponential Distribution
• Weibull Distribution
• Characteristics of the 2-Parameter Weibull Distribution
• Calculating the Parameters of the Weibull Distribution
• Lognormal Distribution
• Characteristics of the Lognormal Distribution
• Calculating the Parameter of the Lognormal Distribution

• Arrhenius Relationship
• Arrhenius Acceleration Factor
• Arrhenius-Exponential
• Arrhenius-Weibull
• Arrhenius-Lognormal
• Arrhenius Confidence Bounds

Eyring Relationship

• Eyring Relationship
• Eyring Acceleration Factor
• Eyring-Exponential
• Eyring-Weibull
• Eyring-Lognormal
• Generalized Eyring Relationship
• Generalized Eyring Acceleration Factor
• Generalized Eyring-Exponential
• Generalized Eyring-Weibull
• Generalized Eyring-Lognormal
• Eyring Confidence Bounds

• Inverse Power Law Relationship
• IPL Acceleration Factor
• IPL-Exponential
• IPL-Weibull
• IPL-Lognormal
• IPL and the Coffin-Manson Relationship
• IPL Confidence Bounds

Temperature-Humidity Relationship

• Temperature-Humidity Relationship
• T-H Data
• T-H Acceleration Factor
• T-H Exponential
• T-H Weibull
• T-H Lognormal
• T-H Confidence Bounds

• Temperature Non-Thermal Relationship
• T-NT Acceleration Factor
• T-NT Exponential
• T-NT Weibull
• T-NT Lognormal
• T-NT Confidence Bounds

Multivariable Relationships: General Log-Linear and Proportional Hazards

• Multivariable Relationships: General Log-Linear and Proportional Hazards
• General Log-Linear Relationship
• Proportional Hazards Model
• Indicator Variables

• Time-Varying Stress Models: The Cumulative Damage Model
• Cumulative Damage Power Relationship
• Cumulative Damage Arrhenius Relationship
• Cumulative Damage Exponential Relationship
• Cumulative Damage General Log-Linear Relationship
• Time-Varying Stress Model Confidence Intervals

Additional Tools

• Additional Tools
• Common Shape Parameter Likelihood Ratio Test
• Tests of Comparison
• Degradation Analysis
• Accelerated Life Test Plans

• General Examples Using ALTA
• Paper Clip Example
• Electronic Devices Example
• Mechanical Components Example
• Tensile Components Example
• ACME Example
• Circuit Boards Example
• Electronic Components Example
• Voltage Stress Example
• Automotive Step-Stress Example
• Interval Data Example

Appendix A: Brief Statistical Background Introduction

• Appendix A: Brief Statistical Background Introduction
• Basic Statistical Definitions
• The Reliability Function
• The Failure Rate Function
• The Mean Life Function
• Median Life
• Mode
• Distributions
• Confidence Intervals (or Bounds)
• One-Sided and Two-Sided Confidence Bounds
• Confidence Limits Determination

• Appendix B: Parameter Estimation Introduction
• Graphical Method
• Least Squares Method
• Life-Stress Relationship Plotting
• Comments on the Graphical Method
• MLE (Maximum Likelihood) Parameter Estimation
• MLE of Accelerated Life Data
• Analysis of Censored Data
• Appendix B Conclusions

Appendix C: References

• Appendix C: References