توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Coupling of Reproduce Kernel Particle Method and finite element method for impact dynamics simulation
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس ملی مهندسی مکانیک ایران، سال
تعداد صفحات: ۱۲
In this paper, the reproduce kernel particle method (RKPM) is employed for 2D nonlinear analysis with deformation Elastic–Plastic. Using weak form of the problem, the discrete momentum equation and approximate function RKPM are substituted in the proposed method. Using explicit method and Gauss quadrature role and imposing the boundary conditions, the location and velocity equations of each particle are obtained. The penalty method is used for nonlinear contact algorithm. The discrete form of Johnson–Cook’s equation is utilized to describe the behavior of the material. Also, the Grunizen pressure equation is implemented for the given state equation. The computations associated with the experiments discussed in the present paper were performed in Fortran 90. To illustrate the validity and efficiency of the method comparisons are made with numerical and experimental results of other investigators and a good agreement is obtained<\div>

۲Numerical and analytical solution of penetration equations by using dynamic spherical expansion method and reproducing kernel particle method
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس ملی مهندسی مکانیک ایران، سال
تعداد صفحات: ۹
the objective of this paper is to present the dynamic spherical cavity expansion method (DSCEM) and reproducing kernel particle method (RKPM) for solving penetration equation in the metal target. At first, weak form of the problem is used to discrete the linear momentum equations in spherical coordinate and Lagrangian environment. Then the approximate function RKPM is substituted in the method. Therefore, using explicit method and Gauss quadrature rule and imposing the boundary conditions, the velocity and location equations are obtained. To show the validity of proposed method, some comparisons are made between the experimental and analytical results of other investigators and a good agreement is obtained<\div>

۳Analytical and Numerical and Experimental Investigation of an Ogive and Semi– Spherical Nose– Shaped Projectile Perforating Into a FRP Laminates Target
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس ملی مهندسی مکانیک ایران، سال
تعداد صفحات: ۱۷
Fiber–Reinforced Plastic (FRP) laminates have received extensive attention due to their high specific strength and high specific stiffness. They are used vastly in various civilian and non–civilian industries. Numerous studies have been conducted to identify and analyze deformation mechanisms occurring during dynamic penetration and perforation of FRP laminates. In this article, a new model is developed which considers friction between projectile nose and target material. The model developed here, is based on Wen’s model of FRP laminate target struck by a projectile. A number of experiments were designed, performed and analyzed for ogive nose projectile and carbon\epoxy laminates. An equation for empirical constant β is derived using the results of experimental investigation. The results of the new model and Wen's model were compared with experimental results. The results of comparison showed that the new model is in good agreement with experimental investigation. In fact, the results of the new model are more accurate than Wen's model. Also, perforations of the same projectile into FRP laminates were simulated using LS–DYNA capability. Impact velocity range was about 100 m\s and normal impact were considered. Simulation results were compared with analytical and experimental results and the results of the comparison showed a very good agreement between them<\div>
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