Subjects: Mechanics >> Other Disciplines of Mechanics submitted time 2024-04-19 Cooperative journals: 《应用力学学报》
Abstract：
An experimental study on the dynamic mechanical properties of polyurea was carried out by using a low impedance split Hopkinson pressure bar and pull rod test device.The dynamic compression and dynamic tensile tests of polyurea 8380 at room temperature(T=18 ℃)and high temperature(50,80 ℃)and low temperature(-40,-20 ℃)were carried out respectively.The dynamic compression and dynamic tensile properties of the material were studied,and the effects of strain rate and temperature on the dynamic mechanical properties of the material were studied.The results show that:the dynamic mechanical properties of polyurea 8380 have significant strain rate effect at different temperatures.With the increase of loading strain rate,the strength,deformation capacity and energy dissipation capacity of the material are improved to varying degrees.The dynamic mechanical properties of polyurea 8380 have obvious temperature dependence.The dynamic compressive properties of polyurea 8380 show different changes at high and low temperatures.The dynamic compressive strength of polyurea 8380 is much lower than that at room temperature.With the increase of temperature,the dynamic compressive strength of the material decreases.At a low temperature,the dynamic compressive strength and energy dissipation capacity of polyurea 8380 are significantly improved compared with those at room temperature.With the decrease of temperature,the dynamic compressive strength of the material increases.
Subjects: Mechanics >> Applied Mechanics submitted time 2022-12-21 Cooperative journals: 《应用力学学报》
Abstract：
With the rapid development of modern computers,the numerical method has been widely used in engineering.The finite element method(FEM),one of the most popular methods,has been successfully integrated into many commercial software packages.However,there are still some limitations in the current FEM,including the modeling of dynamic response of unbounded domain,the representation of stress singularities,and the automatic mesh generation.Additional challenges are posed by the emerging data formats used in modern geometric modeling techniques,such as digital image,stereolithography(STL)models,and point cloud models.The scaled boundary finite element method(SBFEM)is a novel semi-analytical method combining some of the advantages of FEM and boundary element method(BEM).It only discretizes the boundary of the element,while the radial direction is solved analytically,reducing the spatial dimension by one.As a result,the SBFEM is perfectly suitable for the modelling of dynamic stiffness of unbounded domain and representing stress singularities.Furthermore,it is capable of modeling polyhedrons with an arbitrary number of faces and nodes,which greatly reduces the difficulty associated with mesh generation when combining with efficient octree algorithm.Over the years,it has been developed as a general-purpose numerical method,and a large number of researchers have endeavored to apply the SBFEM in fields such as dynamic response of unbounded domain,fracture mechanics,nonlinear analysis,contact problem,adaptive analysis,inverse problem,and high performance computing.In this article,the history and latest progress in SBFEM research are systematically reviewed.
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