Reliability testing is to evaluate the activities of the product to maintain functional reliability in all environments such as expected use, transportation or storage within the specified life span. The product is exposed to its effects under natural or artificial environmental conditions to evaluate the performance of the product under actual environmental conditions of use, transportation and storage, and to analyze the degree of influence of the environmental factors and the mechanism of action. Through the use of various environmental testing equipment to simulate the high temperature, low temperature, high temperature and humidity, and temperature changes in the climatic environment, to accelerate the status of the reaction products in the use environment to verify whether it meets the expected quality in R&D, design, and manufacturing. The goal is to evaluate the overall product to determine the product reliability life.
Reliability Test Classification1, software reliability test
Software reliability is the ability of a software system to perform specified functions within a specified period of time and under specified environmental conditions. In general, reliability can only be measured by testing the software system.
2, hardware reliability test
The hardware reliability test is also called the product's reliability evaluation, and the product's ability to complete the specified functions within the specified time under the specified conditions. In the process of design and application, products are constantly subjected to their own and external environmental impacts and mechanical environment, but they still need to be able to work normally. This needs to be verified by test equipment. This verification is basically divided into R&D and trial production tests. , mass production sampling three parts. Reliability tests include: weathering tests, temperature and humidity tests, gas corrosion tests, mechanical vibration tests, mechanical impact tests, crash tests and drop tests, dust and waterproof tests, and packaging pressure tests, and many other environmental reliability tests.
Reliability testing is a means of conducting product reliability surveys, analyses, and evaluations. The test results provide the basis for failure analysis, the corrective measures taken in the study, and whether the product meets the specifications. The current institutions for reliability testing include: one-pass testing laboratories, etc.
According to the method and purpose of reliability statistical test, reliability statistical test can be divided into reliability verification test and reliability test. A reliability test is a test that is performed to determine reliability characteristics or their magnitude. It is usually used to provide reliability data. The reliability verification test is a test used to verify whether the reliability characteristic value of the equipment meets its specified reliability requirements. Generally, the reliability identification and acceptance test are collectively referred to as reliability verification tests.
1. Divided by environmental conditions, can be divided into simulation tests and field tests under various stress conditions;
2. Divided by test items, they can be divided into environmental tests, life tests, accelerated tests and various special tests;
3. Divided by test purpose, it can be divided into screening test, identification test and acceptance test;
4. Divided by experimental nature, it can also be divided into two major categories: destructive testing and non-destructive testing;
5. However, the commonly used classification method is classified into five categories: environmental tests, life tests, screening tests, and field use tests.
Life tests are subdivided into different categories (see figure below)
Life test is one of the most important and basic contents in reliability test. It is to place the sample under special test conditions and the DAC8550IBDGKRG4 measures the amount of failure (loss) over time. Because the failures occur in a sequence, the life span test data can be analyzed using the order statistics theory, so that the product life characteristics, failure distribution rules, and the reliability index of product failure rate and average life can be calculated. In addition, we can also determine the product's reasonable reliability screening process and conditions, and further improve the basis for ensuring product quality.
Highly accelerated life testing (HALT) and accelerated life testing (ALT) are two of the most effective reliability testing techniques used in product reliability design. Highly accelerated life tests are suitable for finding design defects, determining failure mechanisms, and describing product margins. When the main failure mechanism is not due to cause of wear, it is best to use high accelerated life testing. Accelerated life testing is used to describe the failure mechanism caused by wear. It is usually used to check the failure of the organization when it exceeds the user's expectations and beyond the warranty period.
In most cases, these two methods are best used in combination. Because each method is suitable for revealing different types of failure mechanisms. The proper combination of the two methods provides a complete and comprehensive test method for product reliability design.
The Highly Accelerated Life Test (HALT) was first proposed by Dr. Gregg KHobbs, President of the American Hobbs Engineering Company. Since the 1990s, HALT has been popularized and applied. The greatest feature of HALT is temporal compression, which simulates what may be encountered during the entire lifetime of a product in a matter of days.
GB2689.1-81 Constant Stress Life Test and Accelerated Life Test Method General
GB 2689.2-81 Graph estimation method for life test and accelerated life test (for Weibull distribution)
Simple Linear Unbiased Estimation of Life Test and Accelerated Life Test for GB2689.3-81 (For Weibull Distribution)
Best Linear Unbiased Estimation of Lifetime and Accelerated Life Tests for GB 2689.4-81 (For Weibull Distribution)
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