نتایج جستجو برای: johnson cook equation
تعداد نتایج: 253498 فیلتر نتایج به سال:
The determination of the dynamic response titanium alloys is vital for aerospace industrial applications. present research investigates effect strain history and temperature on localization in Ti-6Al-4V grade-5 alloy. experimental campaign was conducted using a Split Hopkinson Tensile Bar (SHTB) equipped with an ultra-highspeed camera. characterization material highly affected once necking occu...
STEERING COMMITTEE ON PRACTICE GUIDELINES John S. McIntyre, M.D., Chair Sara C. Charles, M.D., Vice-Chair Daniel J. Anzia, M.D. Ian A. Cook, M.D. Molly T. Finnerty, M.D. Bradley R. Johnson, M.D. James E. Nininger, M.D. Barbara Schneidman, M.D. Paul Summergrad, M.D. Sherwyn M. Woods, M.D., Ph.D. Anthony J. Carino, M.D. (fellow) Zachary Z. Freyberg, M.D., Ph.D. (fellow) Sheila Hafter Gray, M.D. (...
A novel multiscale material plasticity simulation model for high-performance cutting AISI 4140 steel
Abstract The achievable machined surface quality relies significantly on the material behavior during high-performance cutting process. In this paper, a multiscale plasticity simulation framework is developed to predict deformation behaviors of AISI 4140 steel under various conditions. was built by coupling three-dimensional discrete dislocation dynamic (3D-DDD) model with finite element method...
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...
In this research, finite element analysis of the conventional drilling and vibration assisted drilling is carried out. The ABAQUS software is employed for FE analysis. The Johnson-Cook models for both plastic deformation and damage are employed for FE simulation.The results of the FE analysis are then verified with experimental results in both conventional and vibration assisted drilling on Al ...
In this paper, a new method for fracture analysis of notched cylindrical cases under explosive loading of High Explosive internal charge has been presented to determine fracture time, fracture radius, fragment velocity and acceleration. Also the fracture dynamics has been simulated by explicit and nonlinear LS-DYNA code. In numerical simulation the behaviour of metallic case has been modeled by...
The main aim of this paper is to study the material removal phenomenon using the finite element method (FEM) analysis for orthogonal cutting, and the impact of cutting speed variation on the chip formation, stress and plastic deformation. We have explored different constitutive models describing the tool-workpiece interaction. The Johnson-Cook constitutive model with damage initiation and damag...
In the present paper, the problem of low velocity impact of plates made from different configurations of ceramic, aluminum, steel and composite (S-glass polyester) is analyzed numerically using Abaqus finite element software. The projectile is assumed to be a rigid body with a hemispherical head. Also, for ceramic layers, Holmquist constitutive model, for aluminum and steel layers, Johnson Coo...
In this research, finite element analysis of the conventional drilling and vibration assisted drilling is carried out. The ABAQUS software is employed for FE analysis. The Johnson-Cook models for both plastic deformation and damage are employed for FE simulation.The results of the FE analysis are then verified with experimental results in both conventional and vibration assisted drilling on Al ...
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