✦ LIBER ✦

Modelling unilateral damage effect in strongly anisotropic materials by the introduction of the loading mode in damage mechanics

✍ Scribed by A. Thionnet; J. Renard

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 543 KB
Volume: 36
Category: Article
ISSN: 0020-7683
DOI: 10.1016/s0020-7683(98)00192-9

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✦ Synopsis

Damage weakens the mechanical characteristics of materials[ But this weakening can disappear if the cracks close again] this is called the unilateral e}ect of damage[ We propose a model of this phenomenon using damage mechanics in the case of a di}use network of identical microcracks[ The microcracks| state is de_ned with two internal state variables[ These two variables are control parameters of the geometry of the microcracks[ They also de_ne the loading mode in damage mechanics as in fracture mechanics[ In order to limit the anisotropy induced by the microcracks\ hence by the loading\ we suppose that the geometry of damage spreads into preferential directions[ Therefore\ this model is essentially applied to materials with a strong anisotropy where the defects follow the constituents of the material[ An application is given for composite laminates[ Þ 0888 Elsevier Science Ltd[ All rights reserved

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