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...

Tube spinning is an effective plastic-forming technology for forming light-weight, high-precision and high-reliability components in high-tech fields, such as aviation and aerospace. However, cracks commonly occur in tube spinning due to the complexity of stress state, which severely restricts the improvement of the forming quality and forming limit of components. In this study, a finite elemen...

Problematic. A combination of experimental and computational methods for studying the processes crack initiation propagation in various specimen’s types is used to determine mechanical properties materials, as well improve accuracy assessing strength durability structural elements. Research objective. Determination parameters Gurson-Tvergaard-Needleman (GTN) material damage model based on numer...

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...

Degradation, damage evolution, and fatigue models in the literature for various engineering materials, mostly metals composites, are reviewed. For empirical established under framework of Newtonian mechanics, Gurson–Tvergaard–Needleman (GTN) type model, Johnson-Cook (J-C) microplasticity some other micro-mechanism based models, using irreversible entropy as a metric with an evolution function t...

Nitroglycerin (GTN) has been used to treat heart disease for many years. It is generally believed that GTN is a prodrug; however, the mechanism for GTN bioactivation remains unknown. Recent studies, using hepatic microsomes, have suggested the involvement of cytochrome P450 3A (CYP3A) in GTN biotransformation. Here, we used an animal model to test the hypothesis that aortic CYP3A plays a role i...