جستجوی مقالات مرتبط با کلیدواژه "equation of state" در نشریات گروه "مواد و متالورژی"

Evaluation of thick-walled cylinders behavior under high strain rate loading is of great importance because of their many applications. Most of the studies around these structures were performed in the state of static and quasi-static. Therefore، development of analytical model in structures loaded with high rates in dynamic state and in complete plastic domain is valuable. The main purpose of this article is to derive a mathematical model based on plasticity flow rules in order to assess the expansion behavior of isotropic thick-walled aluminum cylinder containing TNT. Through this، the equations of radial and circumferential stresses derived from equation of equilibrium and then radial velocity could be calculated by iterative procedure applying instantaneous explosion product pressure as boundary conditions which is variable and depend on geometry of cylinder and also modification of dynamic strength at each moment with considering the strain rate. Therefore، strain rate with its effect on dynamic strength is of importance points in this article. After extraction of radial velocity، other process parameters will be determined and used as input data for the next stage. Furthermore، computer simulation was done، which shows good agreement with the analytical results.

In the present work, the JCZ3 equation of state is used to calculate the equilibrium properties of high explosive detonation products. The JCZ3 equation of state is based on statistical thermodynamic concepts and its coefficients are the coefficient of molecular potential function. As the parameters of JCZ3equation of state are not limited to special conditions (pressure and temperature), so it is expected that this equation of sate can be used in a wide range of conditions. The results show that the accuracy of the JCZ3 equation of state in calculating the properties of high explosive CJ properties is the same as BKW equation of state. In addition, the accuracy of the JCZ3 equation of state in calculating the properties of detonation in low pressures is conform to the results obtained via the equation of state of ideal gas. The current results indicate that accuracy of the results with JCZ3 equation of state in the calculation of detonation properties at medium pressure are better than BKW and ideal gas equation of state.