Experimental Study And Numerical Simulation On The Impact Resistance Of X-type Lattice Sandwich Structure

The three-dimensional lattice structure is being studied and applied in the sandwich structure.Compared with the traditional sandwich structure such as foam and honeycomb,the three-dimensional lattice sandwich structure,as a new kind of lightweight structural material,has higher specific strength,specific stiffness and more design multi-functional application prospect.In this paper,5754 aluminum alloy is used as the upper and lower panels,5052 aluminum alloy plate is used as the core raw material,a new X-type lattice sandwich structure is prepared by adhesive,and its basic mechanical properties are studied.Firstly,the X-type lattice sandwich structure was fabricated by laser cutting and interlocking assembly.The material parameters and properties of the panel and core were tested.Theoretical,experimental and simulation methods are used to study the out of plane compression performance of X-type lattice sandwich structure.The structural model of x-core is simplified as a rod-shaped model with fixed support constraints,and the formula of equivalent flat compression stiffness and flat compression strength of x-core unit cell under static load is derived theoretically.The compression strength and failure state of a group of X-type Lattice Sandwich Structures under quasi-static compression were measured by experiment and simulation.Secondly,the local impact dynamic characteristics of X-type lattice sandwich structure are tested by experiments.The failure state of sandwich plate under different velocities is analyzed.The influence of different structural parameters on the peak load and energy absorption of X-type lattice sandwich structure is studied.The finite element model of X-type lattice sandwich structure is established by using numerical simulation software,and the test results are verified,which proves the reliability of the finite element model and improves the influence law of different structural parameters in the test.Finally,the mechanical properties and energy absorption characteristics of X-type Lattice Sandwich Structure under overall impact and repeated impact are explored by using finite element simulation expansion.It is found that the overall impact performance of X-type lattice sandwich structure is better,and it can withstand multiple impacts without damage.