https://www.feynmanlectures.caltech.edu/index.html

Feynman Torsion wave in rod

Vol II.: [Volume II](https://www.feynmanlectures.caltech.edu/II_toc.html)

Elasticity: [Chahpter 38, Elasticity](https://www.feynmanlectures.caltech.edu/II_38.html)

Sections

38–1: Hooke’s law

38–2: Uniform strains

38–3: The torsion bar; shear waves

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Chapter 38.Elasticity

38-1Hooke’s law

38-2Uniform strains

38-3The torsion bar; shear waves

38-4The bent beam

38-5Buckling

Other sections would be desirable to include.