Background introduction to reliability testing

Tests carried out to determine, verify or improve product reliability are called reliability tests, and are an important part of product reliability work.

Generally, the purposes of product reliability testing are as follows:

(1)Make the product reach predetermined reliability indicators during the development stage. In order to enable the product to meet the predetermined reliability indicators, it is necessary to conduct reliability tests on the samples during the development stage to find out the problems existing in the product in terms of raw materials, structure, process, environmental adaptability, etc., and improve them. After repeated testing and improvement, the reliability indicators of the product can be continuously improved to meet the predetermined requirements.

(2)Conduct reliability appraisal during product development and finalization. When developing and finalizing new products, identification tests must be carried out according to product standards (or product technical conditions) to comprehensively assess whether the product meets the specified reliability indicators.

(3)Control product quality during production. In order to stably produce products, it is sometimes necessary to conduct reliability tests on items specified in product technical conditions for each product. In addition, reliability sampling tests need to be carried out batch by batch or within a certain period of time. Through product reliability testing, we can understand the stability of product quality. If product quality declines due to reasons such as poor quality of raw materials or out-of-control process, it will be reflected in the product reliability test, so that corrective measures can be taken in time to return product quality to normal.

(4)Products are screened to improve the reliability level of the entire batch. Reasonable screening can eliminate products that fail early due to various reasons (such as defective raw materials, improper process measures, operator negligence, production equipment failures, and lax quality inspections), thereby improving the reliability of the entire batch of products. level.

(5)Study the failure mechanism of the product. Through product reliability tests (including simulation tests and field use tests), we can understand the failure modes and failure laws of products under different environments and different stress conditions. Through the analysis of failed products, we can find out the intrinsic causes of product failure (i.e. failure mechanism) and weak links of the product, so that corresponding measures can be taken to improve the reliability level of the product.