Original scientific paper

https://doi.org/10.21278/TOF.484062523

Experimental and Numerical Analysis of Ductile Fracture of Polymeric Materials

Habib Khellafi ; University Mustapha Stambouli of Mascara, Mascara, Algeria
Mostefa Bendouba ; University Mustapha Stambouli of Mascara, Mascara, Algeria *
Hadj Miloud Meddah ; University Mustapha Stambouli of Mascara, Mascara, Algeria

* Corresponding author.

Abstract

Most failures of structural components in service are related to the presence of geometric micro-defects in the material that occurred during its processing. In other words, real materials often contain internal defects such as micro-cracks or cavities. During the deformation process, under sufficient load, these internal defects can propagate and, at the same time, new micro-defects occur in the area of stress concentration (inclusions, voids, etc.). This phenomenon influences the macroscopic properties of the material, gradually decreasing its mechanical strength. The process of structural deterioration of the material, resulting from the nucleation and growth of micro-defects, is called damage. This paper focuses on the application of a three-dimensional finite element method based on a local approach in order to study the effect of nucleation and growth of micro-voids on the failure of polymer materials. A parametric analysis was carried out to study the sensitivity of the fracture parameters of the Gurson-Tvergaard-Needleman (GTN) model in terms of the stress-strain behaviour and ductility of the material in service. The numerical results obtained from those parametric studies were validated by comparing them with the experimental results in terms of stress-strain behaviour.

Keywords

Ductile fracture; the Gurson-Tvergaard-Needleman (GTN) model; Finite element analysis; Stress field; Growth and coalescence

Hrčak ID:

322780

URI

https://hrcak.srce.hr/322780

Publication date:

20.10.2024.

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