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To find a book as "elastic theory(µ¯ÐÔÀíÂÛ)" and then study it.
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George, P.; Trachtman, M.; Bock, C. W.; Brett, A. M. Tetrahedron 1976, 32, 317.
http://www.roymech.co.uk/Useful_Tables/Beams/Strain_Energy.html
http://en.wikipedia.org/wiki/Strain_energy_density_function
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