Meaning
Physical testing procedure exposing electronic or mechanical assemblies to short duration high acceleration pulses assesses structural integrity under transient stress conditions. Controlled drop tests and pneumatic impactors transmit extreme kinetic energy through product enclosures to verify mechanical fastenings and solder joints. Subjecting hardware prototypes to dynamic mechanical shock identifies latent design flaws before volume manufacturing begins.
Measurement parameters stop applying once forces transition into sustained harmonic vibrations or static load conditions.
Impact Resistance
Structural components absorb energy differently depending on peak acceleration levels and wave duration. Energy absorption metrics show whether internal mountings fracture or deform under sudden acceleration spikes. Test engineers evaluating dynamic mechanical shock measure transient displacement using high-speed optical sensors and triaxial accelerometers.
Clear threshold data separates minor housing deformation from catastrophic structural failure.
Test Protocol
Executing shock qualification requires precise calibration of drop height, impact velocity, surface compliance and pulse duration. Half-sine and saw-tooth shock pulses simulate specific environmental events like transportation drops or pyrotechnic stage separation. When technicians submit production samples to dynamic mechanical shock, environmental chambers hold ambient temperature at operational limits to capture thermal interaction effects.
Standardized test profiles ensure repeatable evaluation across batch runs.
Failure Mechanism
Internal solder joint cracking and board delamination occur when mechanical energy exceeds material yield strength. Physical stress concentration points fail rapidly under sudden transient loads. Component evaluation following dynamic mechanical shock isolates micro-fractures through X-ray inspection and acoustic microscopy.
Halting production early prevents widespread field failures in operational environments.
