Accelerated Testing

Accelerated Testing


The length of time required to perform certain reliability tests can be prohibitive. Tests performed to improve a product through the elimination of design defects or to estimate its design life are dependent upon the rate at which failures are precipitated and corrected. Through the application of increased electrical, mechanical and thermal stresses, cycling frequency or operational duty cycles, damage can be accumulated more quickly. This damage accumulation then leads to failure precipitation. If the magnitude of the increase in stress is known and controlled, various models can be used to quantify the acceleration.

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Product Description

The series name has a double meaning:
(1) the spelling of the name r-e-l-e-a-s-e indicates that the series is intended to “release“ the non-expert down the path to reliable products and
(2) the complementary terms “REL” with “ease”, implying the series goal of “reliability made easy.”

Of course, reliability success is seldom easy, requiring expertise and tailoring with tradeoffs addressing life-cycle costs and other issues, but we hope that the series will help those not familiar with reliability practices understand the basics.

While it is unlikely that the reader will become an instant expert in reliability by reading the RELease guides, it is likely that he/she will gain a better appreciation of the basic tools that lead to designing and building reliability into products and systems. The number of pages in each guide is intentionally limited to address only the basics, with comprehensive authoritative references listed for those wanting to know more. The initial set of guides will be continuously expanded in the future. Please let us know how the series can be improved to meet your needs in introducing reliability to the non-expert, or suggest other topics you would like to see developed.

Additional information

File Type:



Richard Wisniewski





Publication Date:

December 2013

Table of Contents

1. What is Accelerated Testing?       2
  1.1. Cost-Benefit Tradeoff     3
2. Accelerated Testing Terminology       4
3. The Process       6
  3.1. Applicable Methods     6
  3.2. Required Inputs     8
  3.3. Process Flow     9
  3.4. Applications and Tailoring     11
4. The Details       11
  4.1. Accelerated Test Process     12
  4.2. Stress Application Methods     14
  4.3. Types of Accelerated Tests     15
    4.3.1. Accelerated Stress Testing/Highly Accelerated Stress Testing (AST/HAST)   15
    4.3.2. Accelerated Life Testing/Highly Accelerated Life Testing (ALT/HALT)   18
    4.3.3. Highly Accelerated Stress Screening (HASS )   21
  4.4. Acceleration Factors     21
    4.4.1. Usage Rate Acceleration Factor   21
    4.4.2. Arrhenius Model   22
    4.4.3. Power Law Model   23
5. Example       24
6. For More Information       27