Simulation of Deformation Behavior of Porous Titanium Using Modified Gurson Yield Function
محل انتشار: مجله شکل دهی مواد، دوره: 3، شماره: 2
سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 355
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شناسه ملی سند علمی:
JR_IJMF-3-2_003
تاریخ نمایه سازی: 9 خرداد 1396
چکیده مقاله:
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 initial porosity. It was recognized that volume constancy assumption during plastic deformation of porous media cannot be satisfied due to both of changes in porosity and hydrostatic stress contribution on yielding. It was found that consideration of porosity variation is necessary during deformation for accurate modeling. Also, porous samples represented the same lateral expansion under less axial displacement relative to fully solid sample regarding the GTN model. The stress distribution of porous samples was different from solid sample considering the GTN model and this was predicted different shear banding. Evolution of porosity during deformation leads to linear like stress response in the plastic deformation regime.
کلیدواژه ها:
Modified Gurson model (GTN) ، Porous Titanium ، Finite element method ، Plastic deformation ، Compaction
نویسندگان
E. Ansari Basir
Department of Materials Science and Engineering
K. Narooei
Toosi university of Technology