In mechanics and materials science stress represented by a lowercase greek letter sigma σ is a physical quantity that expresses the internal forces that neighbouring particles of a continuous material exert on each other while strain is the measure of the deformation of the material which is not a physical quantity.
Stress relief material science.
Ok you may ask but what does that have to do with connectors.
Stress relief cracking is defined as intergranular cracking in the heat affected zone haz or weld metal that occurs during pwht or during high temperature service.
It s all about contact force.
The contact normal force is a critical design parameter for connectors because.
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Stress relaxation i mechanisms materials and temperature.
This is primarily due to keeping the structure in a strained condition for some finite interval of time and hence causing some amount of plastic strain.
In materials science stress relaxation is the observed decrease in stress in response to strain generated in the structure.
Barnard in materials for ultra supercritical and advanced ultra supercritical power plants 2017.
Their stress relief substrates have a unique structure and utilize pillar arrays to reduce the stress on the active areas of devices when strain is applied.
Heat treatment stress relieving.
Heat treating stress relief is used to reduce the internal material stresses within a part or assembly as a consequence of manufacturing processes.
In the metallurgical world stress relaxation is defined as a time dependent loss in stress at constant strain.
The difference between this embrittlement during pwht and service is not just one of time but also.