The S-Beam (Fig. 1) is a sandwich consisting of a synthetic core (A) covered by metal sheets (C) coupled by a heat-curable adhesive (B).
During the stamping operation (Fig. 2), the S-Beam molds easily because its metal sheets are thin and slide over the still-liquid adhesive. After exposure to heat in the E-coat oven (Fig. 3), the S-Beam cures and acquires the structural sandwich condition, transforming bending stress into tensile/compression forces developed over the extension of the surfaces. This configuration increases the stiffness significantly.
Bending Test:
S-Beam’s incompressible core maintains dimensional integrity until it collapses over the force application region (fig 4).