Structure Design And Optimization On 3D Printed Bionic Shelled Stab Resistance Plate

The protective function of conventional Stab Resistance Body Armor(SRBA)has been diminished because of low wearability,of which is heavy and poor in heat and moisture transferring.Herein,a bionic stab resistance shell structure is proposed,which is inspired by stable eggshell structure and fabricated using Laser Sintering(LS)technology,which is a typical rapid prototyping technology.3D printing technology offers a number of advantages,which is not available in other conventional manufacturing technology,free from the complexity of model and a short processing cycle,which are widely used in various fields at present.LS process is easy to be affected by temperature gradient in part bin,which leads to the fluctuation in the performances.To analyze the difference,number of tensile bars has been sintered and tensile test were performed to analyze the stability of LS device used in this research.Experiment platform was set up,conformed to the GA 68-2008 National Standard.The variables of major semi-axis and semi-minor axis of hollow ellipse's effects to stab-resistance performance for bionic-stab-resistance shell structure were studied in this research.Additionally,rules of penetration depth,area density,kinetic-energy curves were revealed for bionic structure with different parameters.The influence of puncture position on penetration depth and difference of stabbing entry shape were analyzed,failure mode was also discussed in this research.25 pieces of bionic shell structure were sintered using PA3200,stab resistance were conducted 3 times on each specimen.It was show that the stab-resistance performance was improved with the major semi-axis increased and degraded with the semi-minor axis decreased.Optimum structure parameter was obtained with a 6.38 kg/m~2 area density.For numerical simulation,dynamics analysis software Autodyn(ANSYS Inc.)was used analyze the stab resistance response of the different structured polyamide plate.By studying the representative perspective of attenuation relationship of knife kinetic energy,it was found that the time needed for knife kinetic energy decreasing to zero of flat plate was two times than bionic shell structure plate.And,with major semi-axis increased,the time for knife kinetic energy decreasing to zero was decreased,and time needed increased with semi-minor increased,the rule was consistent with change regulation of stab-resistance performance of shell structure in stab tests.Finally,several connection models were designed and test in order to translate the single plate to laser sintered SRBA.And a feasibility assembly configuration were proposed to produce flexibly large-area laser sintered SRBA.The 3D printing bionic shell structure had has excellent stab proof properties,which greatly reduced the weight of equipment and relieve the burden of wearer.Besides,the LS technology simplify the processing technology and shorten the processing cycle compare with conventional technology.In summary,this study provide a new way for design and fabrication of SRBA...