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Three comprehensive tests
Project introduction
The three comprehensive tests are comprehensive tests that apply
three environmental stresses of temperature + humidity + vibration
at the same time. The effect of the comprehensive environment can
more realistically and practically reflect the performance of the
product in field use and expose the defects of the product.
If a single environmental stress is applied to the product, it can easily induce the failure of the product. Then, applying three different environmental stresses to the product can easily obtain a 3-5 times acceleration effect. At the same time, by combining different environmental stresses, it can also stimulate failures that cannot occur when a single stress is applied.
When conducting a comprehensive test in which temperature,
humidity, and vibration stress are applied at the same time, from
the mechanism of failure occurrence, the internal part of the
product undergoing temperature cycling expands and contracts due to
the difference in material expansion coefficients, and loosens at
the joints. At this time, if humidity is applied, moisture will
invade from the gaps, reducing the friction coefficient of the
joints and connections. If vibration stress is applied again, the
resonance phenomenon of the product will occur relative to a
specific frequency. Through the repeated process of movement,
moisture absorption, freezing, and resonance, the emergence of new
failure modes (caused by the superposition effect of the single
factor failure mode with a large acceleration and the comprehensive
effect of the three factors) becomes possible.
Application scope
The three comprehensive tests of temperature, humidity and
vibration are widely used in complete machines and parts of
aviation, aerospace, military, electrical, electronic and other
products. The three comprehensive tests are an important test
method that is indispensable for the whole process of product and
material development, prototype testing, and product qualification
testing.
Method standard
Three comprehensive test standard reference: GB/T2423.35,
GB/T2423.36, IEC/EN60068-2-50; IEC/EN60068-2-51.
Test equipment and instruments
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