PWB stability analysis under in-plane forces

The response of a printed wiring board (PWB) in nonlinear dynamics analysis is analyzed with consideration of the in-plane forces. Nonlinear response behavior of a thin laminated PWB is characterized under both in-plane and transverse loading conditions. In-plane forces induced by the incompatible thermal expansion between laminae of the PWB are discussed. Loading effects on the post-buckling behavior and the dynamic instability are studied. Differences in the dynamic stability under nonlinear vibration and the critical load for buckling under static load are compared. The analytical results apply to the general microstructures in thin laminates for their oscillation stability in nonlinear dynamic response. In addition, the PWB stress distribution is given in analytical form for an assessment of its reliability. The PWB failure mechanism is emphasized in the light of the stress-induced defect formation at the sub-micron scale.