First 3 modes of a circuit board, all occurring simultaneously with different frequencies under random vibration with continuous variation in amplitude of response:


Component life capabilities are driven by stresses developed from forcing the component to match the time dependent displacement associated with the resultant board shape. Stresses are further complicated by the stress enhancements associated with high stress regions such as support points, stiffener ends, board cutouts and other effects as illustrated in the following local curvature contour plot.

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