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Partitioning the energy capacity of bone: nominal elastic strain energy (Ue0) depending on the initial elastic modulus (E0); released elastic strain energy (Uer) relating to modulus degradation; hysteresis energy (Uh) reflecting the viscoelastic nature of bone; and irreversible energy (Ui) dissipation, which reflects the free surface energy released by microdamage formation (Uer) and the permanent strain energy (Up).
