Greenwood Williamson Model

Contact Mechanics

Microscopic pressure distributions emerge directly when two rough surfaces compress under normal loads. Individual asperities deform elastically until local interference exceeds a specific plasticity index threshold derived from material hardness and elastic modulus. Thermal expansion changes this initial interference during high power radio frequency module operation inside sealed enclosures.

Boundary Evaluation

Assembly tolerances dictate whether surface asperities flatten completely or retain elastic energy during mechanical fastening. Mechanical engineers apply this framework during finite element analysis to verify that enclosure seals maintain pressure against electromagnetic interference gaskets without crushing internal circuit boards. Production test fixtures measure post assembly deformation against predicted values to validate supplier machining specifications before volume delivery commences.

Failure Prediction

Elastomeric gasket degradation accelerates when local summit pressures exceed rated material thresholds during thermal cycling tests. Overcompressed interfaces lose restorative force, which permits moisture ingress and compromises radio frequency shielding effectiveness across harsh operational environments. Detailed surface topography mapping provides the necessary input data to prevent destructive overclosure during final production torque application.