A Variable Condition of The Damage Description Based on Hypothesis of Strain Equivalence
Ju Yang, Xie Heping
(Beijing Graduate School, China University of Mining and Technology, Beijing, 100083)

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Abstract: This paper discusses the applicability of the damage definition based on Hypothesis of Strain Equivalence. The physical meanings of the modulus of a material before and after damaged are analyzed. It is pointed out that the damage definition based on the hypothesis is only applicable to describe the damage characterist ics of elastic (brittle) materials. It cannot be used to determine the damage characteristics of elastoplastic materials by replacing the elastic modulus after damaged with the relaxed modulus of a material. Otherwise, the evaluation for da mage behavior of elastoplastic materials may be wrong. Additionally, a damage de finition for elastoplastic materials is introduced, in which the mixed influence of the plastic and damage mechanisms is taken into account.
Keywords: damage, hypothesis of strain equivalence, rela xed modulus, elastoplastic.