نتایج جستجو برای: johnson cook equation

تعداد نتایج: 253498  

Journal: :Journal of physics 2023

Abstract The tungsten-copper alloy liner has better performance than the copper liner. In order to study jet forming and penetration characteristics dynamic mechanical properties of alloy-shaped charge liner, this paper uses a multi-functional experimental machine Hopkinson bar device carry out quasi-static tensile impact tests, respectively, fit Johnson-Cook constitutive equation. obtained par...

Journal: :Theoretical and Applied Fracture Mechanics 2021

A non-linear relation between fracture strain and temperature is observed in Split Hopkinson Tension Bar (SHTB) tests for free-cutting steel 50SiB8 at high strains temperatures, due to blue-brittleness. fourth-degree polynomial function the thermal parts of original modified Johnson-Cook (JC) constitutive equation suggested corresponding parameters are identified. Fracture modelling not reporte...

2004
Ivan Tomov Dimov Todor V. Gurov Anton A. Penzov

In this work we consider the rendering equation derived from the illumination model called Cook-Torrance model. A Monte Carlo (MC) estimator for numerical treatment of the this equation, which is the Fredholm integral equation of second kind, is constructed and studied.

2008
Kenneth A. Hawick Daniel P. Playne

The Cahn-Hilliard-Cook equation continues to be a useful model describing binary phase separation in systems such as alloys and other physical and chemical applications. We describe our investigation of this field equation and report on the various discretisation schemes we used to integrate the system in one-, twoand three-dimensions. We also discuss how the equation can be visualised effectiv...

2007
Tuğrul Özel Yiğit Karpat

Advances in plasticity based analytical modeling and finite element methods (FEM) based numerical modeling of metal cutting have resulted in capabilities of predicting the physical phenomena in metal cutting such as forces, temperatures and stresses generated. However, accuracy and reliability of these predictions rely on a work material constitutive model describing the flow stress, at which w...

Journal: :Procedia CIRP 2022

A new modified Johnson-Cook model is developed to capture the non-linear thermal softening behaviour below austenite transformation temperature (723°C) in C45 ferritic-pearlitic steel, which not captured by original (JC) model. The physical mechanisms responsible for this are also studied. experimental quasi-static and high strain rate axisymmetric compression testing from 20°C 720°C implemente...

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