چکیده مقاله
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
کلیدواژهها
نویسندگان
Ataur R. Syed
Department of Mechanical Engineering and Applied Mechanics, North Dakota State University, Fargo, ND ۵۸۱۰۸ ۶۰۵۰, USA
Nabi Abolfathi
Ataur R. Syed Department of Mechanical Engineering and Applied Mechanics, North Dakota State University, Fargo, ND ۵۸۱۰۸-۶۰۵۰, USA.Ghodrat Karami
Ghodrat Karami
Ataur R. Syed Department of Mechanical Engineering and Applied Mechanics, North Dakota State University, Fargo, ND ۵۸۱۰۸-۶۰۵۰, USA.Nabi Abolfathi
شیوه ارجاع
R. Syed, Ataur and Abolfathi, Nabi and Karami, Ghodrat,1388,Degradation at the Composites Interfacial Zones - A Micromechanical Computational Evaluation Procedure,8th International Congress on Civil Engineering,Shiraz
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