مدل تحلیلی برای پیش بینی توزیع تنش در کامپوزیت های لاستیکی تقویت شده با الیاف آرامید با در نظر گرفتن فاز واسط

In this paper, a three-phase micromechanical model of short fiber composites considering interphase is developed to analyze the stress field in aramid fiber reinforced rubber composites. Due to the importance of the interphase in this type of composites, the modified shear-lag model and the imaginary fiber technique have been applied to investigate the load transfer mechanism and stress distribution. The results obtained from the analytical model indicate that the maximum tensile stress is occurred at the center of the fiber, whereas the shear stress of the interface at the end of the fiber reaches the maximum value. In the present model, the mechanical properties of the interphase, such as the elastic modulus, are obtained by averaging the radius-dependent mechanical properties. Also, the effects of the modulus ratio, aspect ratio, interphase thickness and Young modulus on the axial and shear stresses of interface have been investigated. The importance of the present model compared to the previous models is to use of imaginary fiber technique for short fiber composites with a three-phase micromechanics model. Note that the mechanical properties of these composites can be determined by obtaining the distribution of stresses in the matrix. There is also good agreement between the FEM results of full continuum micromechanical three-phase model and the results of the present analytical model.

مدل تحلیلی برای پیش بینی توزیع تنش در کامپوزیت های لاستیکی تقویت شده با الیاف آرامید با در نظر گرفتن فاز واسط Keywords:

تکنیک تقویت کننده مجازی , فاز واسط , کامپوزیت لاستیکی , انتقال تنش , کامپوزیت با تقویت کننده کوتاه