Finite Element Simulation On Mechanical Properties Of Ordered Porous Copper By Reverse Engineering

The metal-gas eutectic directional solidification technique can fabricate ordered porous metal material in which the oriented pores in a cylindrical shape parallel to the solidification direction.This ordered porous metal not only has various performance characteristics of the conventional porous metal material but also has excellent properties such as lower stress concentration and anisotropy.Therefore,ordered porous metal has gained increasing attention from scholars.For the mechanical properties of ordered porous metals,many models have been established in the academic circle,but these models are too idealistic to reflect the real situation.Given this,this paper uses reverse engineering technology to simulate its mechanical properties and compared with simulation data predicted by ideal model to enhance persuasion.In this work,the stress–strain behavior predicted by reverse reconstruction model is more consistent with the experimental data than the stress–strain behavior predicted by ideal model.Until necking,the tensile stress of reverse reconstruction model reaches the almost same value of the experimental result.The tensile stress of ideal model only reaches approximately 0.9 times value of the experimental result.The compressive stress-strain curve predicted by the reverse reconstruction model agrees well with the experimental data all the time,while the error value of stress–strain behavior predicted by ideal model and the experiment data increases sharply after the strain reaches 0.25.Different pore morphology has different effects on the mechanical properties of ordered porous copper.When the loading direction is parallel to the pore orientation,stress concentration is easy to occur at the position where the pore coalescence finishes,the border between instable-state part and steady-state part,and the adjacent part between two pores,while stress concentration areas are difficult to occur at other parts of a pore.More precisely,the matrix around the pore is difficult to produce stress concentration when the loading direction is parallel to the pore orientation.When the loading direction is perpendicular to the pore orientation,the stress is concentrated on whole pores.It is found that as the loading progresses,the pore-densest position is most likely to undergo stress concentration,and the structural damage is first caused.This indicates that the distribution of pores affects the mechanical properties of ordered porous copper.Different loading direction cause different stress distribution,the stress distribution lead to different plastic deformation modes,which makes the mechanical properties of ordered porous copper anisotropic.When the loading direction is 0° to the pore orientation,the matrix around pore does not have obvious stress concentration,and the stress distribution is uniform.So the tensile destruction mode is necking,and the compression destruction mode is the expansion of pore.When the loading direction is 45° to the pore orientation,the stress concentration around the pore is obvious.The angle between the direction of the stress concentration area around the pore and the loading direction is 45°,and the tensile destruction mode is inclined breaking,its compression destruction mode is plastic bending of the pores.When the loading direction is 90° to the pore orientation,the stress concentration around the pore is most obvious.The direction of the stress concentration area around the pore is perpendicular to the loading direction,and the tensile destruction mode is direct breaking,and the compression destruction mode is direct collapsing.