Accelerated Life Testing

This course covers the fundamental of Quantitative Accelerated Life Testing (ALT). The goal of quantitative ALT is to estimate product reliability at normal use conditions based on testing conducted at accelerated stress conditions. The course focuses on the planning and analysis of accelerated life tests, including model development, model validation, and reliability prediction. This course uses Reliasoft ALTA software.

Seminar Content (2 Days)

  1. Introduction to Accelerated Life Testing
    • Purpose and Concepts
    • Types of Accelerated Tests
    • Types of Stress Loadings
  2. Accelerated Life Test Models
    • Stochastic Models (Failure time distributions)
    • Structural/Life-Stress Models
    • Acceleration Factor
    • Single Factor Models (Arrhenius, Eyring, Inverse Power Law)
    • Guidelines for ALT Models
    • Example of ALT Data Analysis and Modeling
    • Participant Exercises
  3. Two-Stress and Multiple Stress ALT Models
    • Temperature-Humidity Model
    • Temperature-Non Thermal Model
    • Generalized Eyring Model
    • Proportional Hazards Model
    • General Model Formulation (with Transformations)
    • Participant Exercises
  4. Time-Varying Stress Tests
    • Step Stress Tests
    • Modeling Time-Varying Stresses (Cumulative Damage Models)
    • Time-Varying Use Stress
    • Participant Exercises
  5. Accelerated Degradation Analysis
    • Degradation Models (Linear, Exponential, Power, etc.)
    • Degradation Modeling at Accelerated Conditions
    • Examples and Participant Exercises
  6. Planning Accelerated Life Tests
    • Traditional, Statistically Optimum, and Compromise Plans
    • Test Planning Guidelines
    • Sample Sizes
    • Allocation of Units to Stress Conditions
    • Precision of Estimates
    • Test Plans for one and two Stresses