Although the environmental test and the reliability test are closely related, they have different differences in the purpose of the test, the amount of environmental stress used, the selection criteria of the environmental force value, the type of test, and the test time.
Test purposes:
The environmental test examines the adaptability of the product to the environment, determines whether the environmental adaptability design of the product meets the contract requirements, and provides decision-making basis for receiving and rejecting. The reliability test is to quantitatively evaluate the reliability of the product, that is, the probability that the product will complete the specified function within the specified time under the specified environmental conditions.
Number of environmental stresses used:
For environmental testing, 19 test items are specified in GJB150, 20 environmental test items are specified in MIL-STD-810 D, and 810F is added to 24 test items, including environmental stresses that are more important for products, such as: Temperature, humidity, salt spray, vibration shock, pressure, solar radiation, sand dust, rain and so on. The test product should be selected according to its future environmental conditions and the degree of impact. Generally, more than 10 environmental stresses should be investigated. The reliability test, based on comprehensive simulation, only combines the combined environmental stress (temperature, humidity, vibration) with electrical stress. It can be seen that the number of environmental stresses selected for the reliability test is much less than the environmental test.
Guidelines for the selection of environmental stress values:
The environmental test basically adopts extreme conditions and uses harshness instead of mildness, that is, the most extreme environmental conditions that the product may encounter during the life cycle are used as test conditions. Many tests are somewhat destructive and generally do not require simulated product operation during the test. The reliability test adopts the effective test, which is to simulate the main environmental conditions and dynamic changes encountered during storage, transportation and use. In GJB-889 and the corresponding MIL-STD-781 D, a set of methods for determining the environmental profile according to the task profile and then simplifying the environmental profile to the test profile for long-term reliability assessment of the product is specified. The reliability test generally does not cause damage to the product. It needs to simulate the working state of the product. The test conditions used are mostly simulated in the milder stress environment often encountered in the work, and the value is much lower than the environmental test.
Test type:
Environmental tests usually use a single factor test and a multi-factor combination test, which are applied to the product in a certain order. The reliability test uses a comprehensive stress test to apply multiple environmental stresses in the same space and apply them to the sample at the same time, which more realistically simulates the influence of environmental conditions. In order to improve the accuracy and reliability of the test results, environmental tests have begun to focus on the development of comprehensive tests, and actively develop large-scale multi-functional environmental test equipment capable of simultaneously applying temperature, humidity, vibration, radiation, dust, wind, rain and other stresses.
Test time:
In environmental testing, the time of each test depends on the selected test and the specific test procedure. It is only because the time required for performance testing at each stage is different, and the test time is much shorter than the reliability test. The reliability test time depends on the reliability index value to be verified and the statistical test plan selected and the quality of the product itself. The time cannot be determined, and the total number of hours of the test product reaches the specified value or can be accepted, and the judgment is rejected.
Main types of environmental testing
Climate environmental test
(GB2423, GJB150A, GJB4, IEC60068, GJB1032, GJB322A, GJB360A, GJB548, GB4208, GJB899, TB3021, etc.)
A. Temperature test: high temperature test, low temperature test, temperature shock test, temperature change test, rapid temperature change test (temperature change rate up to 15 degrees / min), high temperature aging test, temperature cycle test.
B. Humidity (wet) test: constant damp heat test, alternating damp heat test, high temperature and high humidity test (double 85 test, double 95 test);
C. Shell protection level test:
IP42, IP44, P54, IP55, IP65, IP66, IP67, IP68 protection level certification and testing services;
D. Three-proof test: salt spray corrosion test (neutral salt spray test, alternating salt spray test, acid salt spray test), damp heat test (constant damp heat, alternating damp heat), mold test (mold test, mold test) ;
E. Special tests: low air pressure test (altitude altitude test), high air pressure test, solar radiation test, rain test, sand dust test, etc.
2. Mechanical environment test
(GB2423, GJB150A, GJB4, IEC60068, GJB1032, GJB322A, GJB360A, GJB548, TB3058, GJB899, GB/T21563, ISO16750, etc.)
A. Vibration test: sinusoidal vibration test (sweep frequency endurance test), random vibration test, wideband random vibration test, narrowband random vibration test, sine + random stack test;
B. Impact test: half sine wave mechanical impact test, post-peak sawtooth wave impact, impact response spectrum test;
C. Other tests: drop test (free fall, repeated drop), crash test, acceleration test, etc.
3. Comprehensive environmental reliability test (GB2423, GJB150A, GJB899, etc.)
A. Temperature and humidity combination test, temperature + humidity + vibration comprehensive test (three comprehensive test)
Test standards for electronic, electrical, electrical, railway locomotive and military equipment (environmental testing):
According to domestic and international standards, it provides various environmental and reliability tests such as photoaging test, temperature and humidity test, gas corrosion test, mechanical vibration test, mechanical impact test, crash test and drop test, dustproof and waterproof test, and packaging pressure test. Most projects of climate environmental testing, mechanical environmental testing and comprehensive environmental testing can meet GJB, GB, GB/T, IEC, ISO, EN, MIL-STD, SAE, ASTM, ISTA, JIS, IPC, JEDEC, GM , NISSAN and other international and domestic environmental and reliability test standards, while meeting the relevant military standards.
List of environmental and reliability test standards (excluding GJB)
Climate and environmental testing
High temperature test
GB/T 2423.2 IEC 60068-2-2 EIA-364-17
Low temperature test
GB/T 2423.1 IEC 60068-2-1 EIA-364-59
Rapid temperature change test
GB/T 2423.22IEC60068-2-14
Thermal shock test
GB/T 2423.22IEC60068-2-14 EIA-364-32
Constant temperature and humidity test
GB/T 2423.3 IEC 60068-2-78MIL-STD-202
Temperature change test
GB/T 2423.22IEC60068-2-14
Alternating hot and humid
GB/T 2423.4 IEC 60068-2-30
Temperature and humidity combined cycle test
GB/T 2423.34IEC60068-2-38 MIL-STD-202
Salt spray test
GB/T 2423.17IEC 60068-2-11GB/T 10125
IP rating test
IEC 60529 GB/T 4208 IEC 60598
UV test
ISO 4892.3 GB/T 16422.3 ASTM G 154...
Xenon lamp test
ISO 4892.2 GB/T 16422.2 ASTM G 155...
Gas corrosion test
EIA-364-65 GB/T 2423.51 IEC 60068-2-60 ...
Low air pressure test
GB/T 2423.21IEC 60068-2-13
Ozone aging test
GB/T 7762 ISO 1431-1
High pressure cooking test
JESD22-A102-CJESD22-A110BJESD22-A118
Mechanical testing:
Vibration test
GB/T 2423.56IEC 60068-2-64 ASTM D4728...
Impact test
GB/T2423.5 IEC60068-2-27 EIA-364-27 ...
Crash test
IEC 60068-2-27GB/T 2423.6 GB/T 4857.20
Drop test
GB/T 2423.8 ISO 2248 GB/T 4857.5
RCA tape friction test
ASTM F 2357
Alcohol, eraser, pencil friction test
GB/T 6739 ASTM D 3363
Contact resistance test
EIA-364-23 EIA-364-06 MIL-STD-202
Insulation resistance test
EIA-364-21 MIL-STD-202
Withstand voltage test
EIA-364-20 MIL-STD-202
Cross-cut test
ASTM D 3359
Insertion force test
EIA-364-13
Durability test
EIA-364-09
Wire swing test
EIA-364-41
Comprehensive test:
Three comprehensive test
GB/T 2423.35 GB/T 2423.36
HALT/HASS
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Packaging product ISTA test
1A, 1B, 1C, 1D, 2A, 2B, 2D, 2E
Bagasse Pulp Container,Bagasse Containers,Bagasse Food Container,Sugarcane Pulp Containers
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