Sec. 1.8 HISTORICAL REMARKS 25 then develop classical and computational methods to cover it. Then biology becomes a new source of fresh water to irrigate our field of mechanics. The present book will not deal with biomechanics any further. Some references are given in the Bibliography at the end of the book. 1.8. HISTORICAL REMARKS The best-known constitutive equation for a solid is the Hooke’s law of linear elasticity, which was discovered by Robert Hooke in 1660. This law furnishes the foundation for the mathematical theory of elasticity. By 1821, Louis M. H. Navier (1785-1836) had succeeded in formulating the general equations of the three-dimensional theory of elasticity. All questions of the small strain of elastic bodies were thus reduced to a matter of mathemat- ical calculation. In the same year, 1821, Fresnel (1788-1827) announced his wave theory of light. The concept of transverse oscillations through an elastic medium attracted the attention of Cauchy and Poisson. Augustin
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