کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
816845 | 1469392 | 2016 | 18 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Predictions of J integral and tensile strength of clay/epoxy nanocomposites material using phase field model Predictions of J integral and tensile strength of clay/epoxy nanocomposites material using phase field model](/preview/png/816845.png)
We predict macroscopic fracture related material parameters of fully exfoliated clay/epoxy nanocomposites based on their fine scale features. Fracture is modeled by a phase field approach which is implemented as user subroutines UEL and UMAT in the commercial finite element software Abaqus. The phase field model replaces the sharp discontinuities with a scalar damage field representing the diffuse crack topology through controlling the amount of diffusion by a regularization parameter. Two different constitutive models for the matrix and the clay platelets are used; the nonlinear coupled system consisting of the equilibrium equation and a diffusion-type equation governing the phase field evolution are solved via a Newton–Raphson approach. In order to predict the tensile strength and fracture toughness of the clay/epoxy composites we evaluated the J integral for different specimens with varying cracks. The effect of different geometry and material parameters, such as the clay weight ratio (wt.%) and the aspect ratio of clay platelets are studied.
Journal: Composites Part B: Engineering - Volume 93, 15 May 2016, Pages 97–114