Digital-controlled finished circuit board reliability quick evaluation method under combined effects of environment

Abstract

The invention discloses a digital-controlled finished circuit board reliability quick evaluation method under combined effects of environment. The digital-controlled finished circuit board reliability quick evaluation method includes (I) selecting temperatures and direct-current bias as accelerating stress, and building accelerating model for a circuit board to be evaluated; (II) determining accelerating stress level and stress combinatorial number, performing accelerating service life tests in groups, and recording test data; (III) selecting a service life distribution model, solving parameters according to the test data, and calculating characteristic service life values in varied combinations of accelerating stress; (IV) matching and determining model coefficients for the accelerating model of the circuit board according to the characteristic service life values, performing reliability evaluation, and obtaining reliability index of the digital-controlled finished circuit board under combined effects of environment. By the aid of the digital-controlled finished circuit board reliability quick evaluation method, the reliability index of the digital-controlled finished circuit board under combined effects of environment can be quickly and quantitatively determined, requirements of system reliability quick evaluation are met, the whole flow is convenient to operate and high in efficiency, and requirements of high reliability on a digital control system are met.

Description

technical field [0001] The invention belongs to the technical field of printed circuit boards, and more specifically relates to a method for rapidly evaluating the reliability of a digitally controlled finished circuit board under comprehensive environmental effects. Background technique [0002] Printed circuit boards are the main components of electronic products and are widely used in various fields such as aviation, numerical control, computers, and automation instruments. Considering that the quality performance and stability of printed circuit boards are crucial to products, environmental tests are often required during the manufacturing process to establish their reliability indicators. Environmental testing can be roughly divided into climate environmental testing, mechanical environmental testing and comprehensive environmental testing, among which climate environmental testing refers to placing the finished printed circuit board to be tested in different temperatur...

AI Technical Summary

Problems solved by technology

[0005] In the current technology, the inherent acceleration models used in the accelerated life test of test samples usually include Arrhenius model, inverse power law model, Eyring model, etc. These existing models can quickly determine the acceleration factor and save time, but Usually only the influence of single stress is considered, and the application objects are not clear and diverse, and the accuracy is lacking, and the assignment of model variables is complicated

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