where the product A40q is positive.

The junction ratio a/b is varying slowly with the Poisson's ratio. For v e [0, 1/2], we obtain a/b e [0.6495, 0.6266], respectively. This hybrid configuration is represented in Fig. 3.7-Left for a Schott Zerodur vitroceram where v = 1/4 ^ a/b = 0.6377. We can derive other hybrid configurations by modifying the outer rigidity and its associated load. This is achieved if the ratios t^/q are identical for the two zones (Fig. 3.7-Right).

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