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هشتمین کنگره بین المللی عمران شیراز
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • degradation at the composites interfacial zones - a micromechanical computational evaluation procedure

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1156
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
    in this paper, a micromechanics computational algorithm for characterization of structures with unidirectional fibrous composites is introduced. the modeling accounts for the microstructural behavior as well as the interface properties at the microscale where the interface size is highlighted. the interface is simulated by cohesive zone elements. the constitutive materials for the cohesive zone are extracted from the experimental traction-separation relations. repeating unit cells (rucs) of the representative volume elements (rve) of the composite is modeled under specified normal and shear kinematical and loading conditions. the behavior of such unit cells monitor the stiffening and degradation characterization of the composite with the interface stiffening, softening and debonding modeled in an accurate manner. the model is implemented for two examples with linear/nonlinear traction-separation behavior; significant differences in the composite behavior is observed when two different cohesive zone laws were implemented indicating that the shape of the softening zone is important in addition to the initial stiffness and peak stress in cohesive zone law. this micromechanical cohesive zone model is also implemented to examine the impact of adhesion for undulated fibers on the overall composite structure response. the composite strength and stiffness for all the cases examined are compared with the experimental data with good agreements.

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