Thermal Stress Screening

Very rapid cycles of temperature are applied to products causing them to expand and contract. This movement causes mechanical stresses, which will concentrate at any weak point to bring about failure. The process is often applied at a design stage in order to build robustness into a product. It is also used at various stages in a manufacturing process to ensure that reliable product is shipped to the customer and so reducing the potential for field failures. An effective thermal stress screening process will call for approximately 6 or more very rapid cycles of high and low temperature. The upper and lower temperature extremes and the optimum number of cycles can be established by experimentation. They will vary from one product type to another and will depend on such factors as the product mass and material type.

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