Reliability test background introduction
Tests conducted to measure, verify or improve product reliability are called reliability tests, which are an important part of product reliability work. Generally, the purpose of reliability tests on products is as follows: to make the product reach the predetermined reliability index during the development stage. In order to make the product reach the predetermined reliability index, reliability tests need to be conducted on samples during the development stage to find out the problems in raw materials, structure, process, environmental adaptability, etc., and improve them. After repeated tests and improvements, the reliability indexes of the product can be continuously improved to meet the predetermined requirements. Reliability identification is carried out during product development and finalization. When new products are developed and finalized, identification tests should be carried out according to product standards (or product technical conditions) to comprehensively assess whether the product meets the specified reliability index. Control product quality during the production process. In order to produce products stably, it is sometimes necessary to conduct reliability tests on each product according to the items specified in the product technical conditions. In addition, reliability sampling tests need to be carried out batch by batch or within a certain period of time. The stability of product quality can be understood through reliability tests on products. If the product quality is reduced due to poor raw material quality or out-of-control process flow, it can be reflected in the reliability test of the product, so that corrective measures can be taken in time to restore the product quality to normal. Screen products to improve the reliability of the entire batch of products. Reasonable screening can eliminate products that fail early due to various reasons (such as defective raw materials, improper process measures, operator negligence, production equipment failure, and lax quality inspection, etc.), thereby improving the reliability of the entire batch of products. Study the failure mechanism of products. Through product reliability tests (including simulation tests and field use tests), we can understand the failure mode and failure law of products under different environments and stress conditions. Through the analysis of failed products, we can find out the internal causes of product failure (i.e., failure mechanism) and the weak links of the product, so that we can take corresponding measures to improve the reliability of the product.