Crack Extensions in Compact Tension Specimens of Hydrided Irradiated Zr-2.5Nb Materials Using Cohesive Zone Model

2017 ◽  
Author(s):  
Shengjia Wu ◽  
Shin-Jang Sung ◽  
Jwo Pan ◽  
Poh-Sang Lam ◽  
Douglas A. Scarth
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cohesive Zone ◽  
Crack Extension ◽  
Cohesive Zone Model ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Zone Model ◽  
Element Analysis ◽  
The Finite Element Analysis

The crack extension in a compact tension specimen of hydrided irradiated Zr-2.5Nb material is investigated by a two-dimensional plane stress finite element analysis. The stress-strain relation of the Zr-2.5Nb material for the finite element analysis is obtained from fitting the experimental tensile stress-strain curve of the irradiated Zr-2.5Nb material without hydrides by a three-dimensional finite element analysis. The calibration of the cohesive zone model with a trapezoidal traction-separation law is based on fitting the load-displacement-crack extension experimental data of a compact tension specimen of hydrided irradiated Zr-2.5Nb material. The general trends of the load-displacement, crack extension-displacement, and load-crack extension curves obtained from the finite element analysis based on the calibrated cohesive zone model are in agreement with the experimental data.

Finite Element Analysis on the Random Chopped Fiber Composites

2009 ◽  
Author(s):  
Yi Pan ◽  
Assimina A. Pelegri
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cohesive Zone Model ◽  
Fiber Composites ◽  
Interfacial Debonding ◽  
Matrix Cracking ◽  
Zone Model ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Sequential Adsorption

A micro-mechanics based finite element analysis method for random chopped fiber composites is applied. A modified random sequential adsorption technique is developed to generate representative volume elements of the composites so to overcome the “jamming limit” in the existing techniques. A homogenization scheme is applied to acquire the effective elastic constants of the composite. Two damage mechanisms are considered, matrix cracking and interfacial debonding, which occur prior to fiber breakage and consequentially leading to catastrophic failure. The incremental plastic model and the cohesive zone model are adopted to account for matrix plasticity and interfacial debonding, respectively. The finite element analysis results are validated by experimental data.

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