What are the main test items of reliability environmental test?

Date：2022-08-25 15:55:14Views：672

The test site for environmental test shall be widely representative, capable of carrying out as many test items as possible, and shall be as close as possible to the possible operational environment in the future. However, the environmental test site is often different from the real use environment. When selecting the simulation test items, the use requirements of the items to be tested shall be specifically analyzed. The selected test items shall not only represent the main use environment, but also accelerate the test speed and save money. This paper has collected and collated some materials, and I hope that it can be of great reference value to all readers.

Environmental tests include natural typical environmental tests, service environmental tests and artificial simulated environmental tests. At present, foreign countries have standardized environmental testing, and many countries have also formulated environmental testing standards. Generally speaking, these standards are similar, mainly including the following environmental testing projects:

1. Low pressure (high altitude) test

The test is applicable to the weapons transported by air in the cargo cabin of the aircraft, and the weapons used on the plateau and the air weapons rapidly drop in pressure after the aircraft is injured. The purpose of the test is to test the performance of the weapon in the low-pressure environment and the impact of the rapid pressure drop on the performance of the weapon. The maximum height of the simulation can reach 30000 meters, and the temperature value corresponding to the height is taken during the test.

2. High temperature test

During the test, the weapon was in high temperature air, but was not directly exposed to sunlight. The test is aimed at storing or using weapons indoors or in closed space or near heat sources such as engines in high temperature season. This test shall be carried out only when the solar radiation test cannot verify the high temperature effect. The purpose of the test is to check the performance of storage or use in high temperature environment.

3. Low temperature test

The test is applicable to test pieces that are likely to be used in low temperature environment during the life cycle. The purpose of the test is to test whether the test piece can be stored, manipulated and operated in a long-term low-temperature environment.

4. Thermal shock test

The test is applicable to weapons that often undergo extremely rapid temperature changes in a predetermined use area or use mode. For example, electronic equipment hoists, missiles, photoelectric equipment and bombs in bomb silos on aircraft that take off from desert airports and rise to high altitude; Weapons dropped from high altitude to desert areas; Weapons transferred from indoor to outdoor in the Arctic. At present, only the thermal shock test in air is carried out, and it is possible to carry out the thermal shock test from air to water in the future. The purpose of thermal shock test is to test the effect of sudden change of ambient temperature on weapon performance.

5. Solar radiation (sunshine) test

This is a test of weapons and their manufacturing materials exposed to the sun. Solar radiation can cause photochemical and thermal effects. In most cases, this test can replace the high temperature test. The influence of solar radiation on the use or open storage of weapons or related materials can be tested through sunshine test.

6. Rain test

The test is applicable to weapons that may be exposed to rain during use. Rain test includes rain test when there is no wind and rain test when there is wind. The purpose of rain test is to test the waterproof performance of rain shielding equipment and the performance of weapons during and after rain.

7. Moisture proof test

The test is applicable to weapons that may be used in warm and humid environments. The warm and humid environment is the reason why there are seasons of different length in the whole year in the tropics and in the middle latitudes. The purpose of the test is to test the adaptability of the weapon to the warm and humid environment.

8. Mould proof test

Warm and humid are the conditions for the growth of microorganisms, which widely exist in the tropics and mid latitudes. Mold prevention should be considered in the design of all standard general weapons and equipment. The purpose of the test is to evaluate the degree of mildew of the weapon and the impact of mildew on the performance or use of the weapon.

9. Salt spray test

Salt is widely distributed on the earth. There is salt in the sea, atmosphere, ground, lakes and rivers, especially in the coastal areas. The salt content in the sea is the largest. There are no weapons that do not come into contact with salt. Therefore, all weapons are in some form of salt environment during their life cycle. The purpose of salt spray test is to test the influence of salt containing humid atmosphere on the performance of weapons, especially the performance of coating protective layer and the compatibility of materials.

10. Sand and dust test

The test is applicable to all mechanical, electrical, electronic and electrochemical weapons used in the air with high dry sand or dust content. The test is divided into dust raising test and sand lifting test. Dust and fine sand are used in the dust test, and fine dust can enter the gaps, cracks, bearings and joints. 149 ~ 850 for sand lifting test μ M (micron) sand particles, large and sharp sand particles can produce erosion and blocking effects, reducing the effectiveness, reliability and maintainability of equipment. The purpose of sand and dust test is to test the use and storage capacity of weapons in sand and dust environment.

11. Immersion test

Immersion test includes immersion, dripping and pressurized water test. The water immersion test is applicable to equipment requiring water tightness and equipment used in full or partial immersion in water. In some cases, this test can replace the rain test to check the water tightness. The purpose of the test is to test the ability of the weapon to be immersed in water without water leakage.

12. Freezing rain test

The test is applicable to equipment that may encounter freezing rain in normal use. The purpose of the test is to test the impact of rain, fog and splashed seawater on the equipment performance after falling on the equipment, and also to evaluate the deicing device and technology.

These are the related contents of the "reliability environment test project" brought by the core test. I hope it can help you. We will bring more wonderful contents in the later period. The company's testing services cover: electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing, factory incoming material inspection, braiding and other test items. Welcome to call Chuangxin testing, we will serve you wholeheartedly.