The year is 1981. The scene, the R&D department of a major aircraft company. "Uh, sir?" the young engineer stammers. "Sir? I am concerned about these stiffen-ers you want to bond onto the skins." "What's the problem?" the elder engineer asks, kindly, but with a bit of condescension. "Well, the skins are all ±45, which means they have a Poisson's ratio of about 0.8, and when they load up, the shear between them and the stiffeners will be very high, and I am afraid the adhesive will fail."
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