Comprehensive stress acceleration test method

Abstract

The present invention discloses a comprehensive stress acceleration test method, comprising selecting failure stresses, such as S and S, having smaller coupling effects from all failure stresses S of a product as test comprehensive stress; determining the maximum stress levels S<max> and S<max> under the condition that the failure mechanism of the product is not changed according to existing test information or history similar product fault information; designing an orthogonal test based on the information according to reasonable selection of the test stress levels and reasonable selection of test samples; obtaining failure data t<hlk> of the samples under combination of different comprehensive stress levels; obtaining an acceleration model of the stress S satisfying product characteristics by fitting according to data of failure changes of the product along with changes of the magnitude of the stress S under the condition that the magnitude of the stress S is constant, and obtaining an acceleration model of the product under the stress S in the same way; obtaining acceleration model parameters under the various stresses; converting the failure data t<hlk> under the comprehensive acceleration stress into failure data t'<hlk> under the conventional comprehensive stress; and finally fitting a product fault probability distribution expression in a failure probability distribution manner, and completing verification or evaluation of indexes of product reliability.

Description

technical field [0001] The invention relates to a comprehensive stress acceleration test method, which belongs to the technical field of product component reliability and life evaluation. Background technique [0002] With the continuous progress of science and technology such as electronic components and materials, the reliability level of products is getting higher and higher. Due to the factors of long test time and high test cost, conventional test methods have been difficult to meet the needs of product reliability index verification. The accelerated test method has been widely used. It can accelerate the failure of the tested product by increasing the test stress without changing the failure mechanism of the product, so that the necessary information can be obtained in a short time to complete the verification of product reliability indicators or Evaluate. [0003] Most of the existing accelerated tests are to apply a single stress to compare the failure data of multi...

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Problems solved by technology

[0004] The invention provides a new type of comprehensive stress acceleration test method. According to the existing HALT test information or limit test information of the product, through the reasonable design of the test plan, and then based on the classic acceleration model, two kinds of Or a variety of accelerated stress model parameters, the equivalent failure data under the conventional comprehensive stress can be obtained after conversion of the acceleration factor, which can meet the needs of product reliability index verification or evaluation. Good features, to a certain extent, solve the problems of long test period and high cost in the past

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