In this research the stress-strain curve of porous Titanium, as a common material for biomedical application, was predicted using the mechanical properties of fully solid Titanium experimental data. Modified Gurson model (Gurson-Tvergaard-Needleman (GTN) model) was used to predict the plastic response of porous Titanium in compaction. Different values of GTN parameters were used for different i...

Based on meso-damage mechanics and finite element analysis, the aim of this paper is to describe the feasibility of the Gurson-Tvergaard-Needleman (GTN) constitutive model in describing the tensile behavior of corroded reinforcing bars. The orthogonal test results showed that different fracture pattern and the related damage evolution process can be simulated by choosing different material para...

A novel micromechanics based damage model is proposed to address failure mechanism of defected solids with randomly distributed penny-shaped cohesive micro-cracks (Barenblatt–Dugdale type). Energy release contribution to the material damage process is estimated in a representative volume element (RVE) under macro hydrostatic stress state. Macro-constitutive relations of RVE are derived via self...

This paper is devoted to the numerical and experimental study of ductile fracture in bulk metal forming 2017A-T4 aluminum alloy. From an standpoint, alloy investigated under compressive load. Two cross-sections solid hollow specimens are considered. The mechanical behavior microstructure were characterized. It found that well-known barrel shape obtained when a load applied. Analyses topographie...

In this paper the capability of Gurson-Tvergaard-Needleman (GTN) model in the prediction of ductile damage in 7075-T651 aluminum alloy is investigated. For this purpose, three types of specimens were tested: Standard tensile bars, Round notched bar (RNB) specimens and compact tension (C(T)) specimens. Standard tensile bar tests were used to obtain the mechanical properties of the material and t...

In this paper, the initial and maximum load was studied using Finite Element Modeling (FEM) analysis during impact testing (CVN) of pipeline X70 steel. The Gurson-Tvergaard-Needleman (GTN) constitutive model has been used to simulate growth voids deformation steel at different temperatures. FEM simulations results study sensitivity with GTN parameters values proposed variation Finally, applied ...

Ductile tearing of a full size precracked pipe is experimentally investigated. In order to model and interpret the test, material characterized using smooth notched tensile bars C(T) specimens. This experimental database used fit parameters non local Gurson–Tvergaard–Needleman (GTN) proposed in Zhang et al. (2018) Chen (2020). The finite element simulations specific elements allowing for contro...

Micro-scaled progressive sheet metal forming is a promising process for producing bulk microparts, given its advantages of high efficiency and low cost. To enhance quality efficiency, it important to have an in-depth understanding the mechanism model fracture behavior accurately. However, prediction formation in materials at micro-scale has not yet been well explored, thus current knowledge suf...

Abstract In this paper, the Gurson-Tvergraad-Needleman (GTN) model is used to study damage of stainless steel springs at high temperatures. The basic material and GTN parameters are determined from stress-strain curves tensile tests. Then evolution 300 °C 900 analyzed based on finite element simulations. results show that below 600 °C, change volume fraction holes in spring, along with increase...