Thermal shock occurs when an object is rapidly cooled from high temperature. The surface layers contract against the inner layers, leading to the development of tensile stress and the propagation of cracks.
Causes of Thermal Shock- Thermal shock occur when too much stress is created in a piece of ware during the heating and cooling process. It comes from temperature differences in the ware and can cause small to large cracks in the piece, or the piece may actually break.
Thermal shock Chamber- Thermal Shock Environmental Chambers has a product carrier basket that automatically transports a product under test between separately controlled temperature zones. … With built-in viewing windows, users can easily observe the product as it’s transferred between different temperature zones.
Thermal shock chambers are used to accommodate various types of product testing. Thermal Shock Chambers perform tailored environmental stress screening of component and board electronic assemblies. Our unique chamber design transfers product between two extreme temperature-controlled chambers, passing equal volumes of high velocity conditioned air over the product and resulting in rapid product temperature changes. The induced thermal stresses can reveal hidden manufacturing defects in electronic sub-assemblies and other components by the expansion and contraction of critical parts.
THERMAL SHOCK TEST, MIL-STD-883H METHOD 1010.8
One of the main levers available for the product development, in order to accelerate the validation phase, is the specimen thermal shock tests.
This type of test allows to highlight, during the validation phase and in a short time, the possible critical issues that could compromise performance and reliability during the production process.
In particular, the test that can be performed with the MIL-STD-883H method 1010.8 subjects the specimen to repeated thermal cycles that produce low/medium frequency mechanical stresses. The DUT (Device under Test), subjected to this test, will tend to deform in a non-linear way due to the different expansion coefficients of the materials it could be composed of. These, in fact, will suffer expansions/contractions in volume causing strong mechanical tensions, sometimes up to the breakage if the thermal shock suffered by the product is greater than the maximum resistance of the materials.