Deformation And Energy Absorption Of Multilayer Corrugated Core Sandwich Panel Under Out-of-plane Load

Due to its high specific strength,specific rigidity and good energy absorption performance,the sandwich structure can well protect the objects or personnel in the sandwich structure when subjected to impact,and has broad application prospects in both military and civilian fields.Therefore,it is of great significance to study the mechanical behavior of sandwich structures under lateral compression.This paper takes the corrugated core sandwich panel as the research object,using a combination of finite element simulation and theoretical analysis to study the deformation mode and energy absorption of the multilayer corrugated core sandwich panel under out-of-plane compression loads.The main tasks were as follows:(1)The finite element models of single-layer,double-layer and three-layer corrugated sandwich panels with trapezoidal,triangular and rectangular cores was established to study the deformation laws and mechanics of corrugated sandwich panels with different cores under quasi-static compression loads.The effects of structural parameters such as panel thickness,core layer thickness and core bottom angle on the three-layer trapezoidal sandwich panels were studied.The research results show that: among the single-layer corrugated core sandwich panels,there is almost no bending deformation on and under the sandwich panels,and the three core layer side rib structures have different degrees of bending deformation;the rectangular core sandwich panels has the best energy absorption performance,and the trapezoidal core layer sandwich panels are second,and triangular core sandwich panels are the worst;the energy absorption performance of double-layer corrugated core sandwich panels from high to low are: trapezoidal core,rectangular core,and triangular core;among the three-layer corrugated core sandwiches,the trapezoidal core layer has the best energy absorption performance,followed by the triangular core layers,and the rectangular core layers has the worst performance.The thickness of the panel has little effect on the energy absorption performance of the sandwich panels.As the panels thickness increases,the sandwich core the energy absorption of the board first increases and then decreases;the thickness of the core layers and the bottom angle of the core layers have a greater impact on the energy absorption performance of the sandwich panels,and as the thickness of the core layers and the bottom angle of the core layers increase,the energy absorption of the sandwich panels increases.(2)The theoretical analysis models of corrugated core sandwich panel under quasi-static compression load was established.Based on the simplified super-folded unit theory,a theoretical models of the mean compressive force of single-layer,double-layer and three-layer corrugated-core sandwich panels was established,and the energy absorption of the multilayer corrugated-core sandwich panels was analyzed.The results show that the energy absorption of the sandwich panels is related to the plastic hinges formed during the compression process.The more plastic hinges and the greater the angle change during the structural deformation,the better the overall energy absorption performance.The theoretical analysis and numerical simulation results are in good agreement.(3)The dynamic response of three corrugated core sandwich panels under dynamic compression load was studied.The finite element simulation of single-layer,double-layer and three-layer corrugated-core sandwich panels under different impact loads were carried out,and the deformation laws and energy absorption performance of the sandwich panels were analyzed.The research results show that with the increase of impact speed,the energy absorption performance of single-layer,double-layer and three-layer corrugated core sandwich panels increases and the deformation mode will change with the increase of speed.Under the dynamic load of the same speed,the initial peak force of the double-layer and triple-layer trapezoidal sandwich panels is lower than that of the single-layer trapezoidal sandwich panels;as the speed increases,the deformation mode of the sandwich panels changes;when the speed is greater than or equal to 20m/s,the single-layer trapezoidal sandwich panel has better energy absorption and average compression force than the double-layer and three-layer trapezoidal sandwich panels.