Thermal Shock Testing

Mechanical Strain Verification

Assemblies undergo programmed shifts in a dual chamber cabinet to assess the integrity of chemical bonds between layers. Technicians program the transition time between chambers to remain under a specific duration, which prevents the parts from stabilizing at the new temperature before the cycle repeats. High rates of change prevent thermal equilibrium throughout the substrate, ensuring that localized expansion forces impact the solder balls.

Manufacturers rely on these results to determine if a specific flux residue or conformal coating maintains adhesion during field use. The process continues until the part reaches a failure mode or completes the required number of cycles specified by an industry standard.

Structural Failure Threshold

Fatigue resistance defines the limit of a design when subjected to repeated thermal excursions. Microscopic cracks grow incrementally with every cycle, eventually bridging the gap across a joint to open a circuit. Measuring electrical continuity during the actual transition provides the most accurate data regarding the exact moment of failure.

Designs with mismatched coefficients of expansion demonstrate a lower count of completed cycles before electrical signals fail. These failures indicate that the physical geometry of the solder connection lacks sufficient ductility to survive rapid environmental shifts.