Study On Dynamic Response Of Hollow Sphere/aluminum Composite Foam Sandwich-like Plate Structures

In recent years, the aluminum foam has attracted people’s attention as anenergy absorption material. This material has high specific strength and specificstiffness, lightweight, low density and excellent energy-absorption capacity.Especially the sandwich-like plate structure composed by aluminum foam and steelplate is a widely used structural style. The blast wave attenuation characteristic ofaluminum foam sandwich-like plate structure has become a current research focus athome and abroad. With the development of material science in recent years, HollowSpheres/Al composite foam is created as a novel composite material made of a metalaluminum skeleton combining with fly ash/Al and Al2O3hollow ball. This materialexhibts the mechanical properties of both metal and foam, and other characteristicssuch as lower cost, higher strength and energy absorption capability. It is aenergy-absorbing material with a better application prospects in the protectiveengineering and the field of sturcutral explosion resistance. At prepsent the researchon the dynamic mechanical properties of this new composite material is still in earlystage at home and abroad.Under the research background of the national defense explosion resistance,detailed and through experimental investigation and numerical simulation has beencarried out in three aspects of the hollow ball/1199Al composite foam material inthis paper. These aspects are the dynamic mechanical behavior of the compositefoam material under high strain rate, the law of stress wave attenuation of thesteel-composite foam sandwich-like plate structure and the influence of differentparameters on the energy absorption capability of the sandwich-like plate structure.The following research work have been performed:Part1: use the SHPB test to study the strain rate effect of the hollowball/1199Al composite foam material, obtain the stress-strain curve at differentstrain rates and investigate the energy absorption capability by means of comparingthe novel material with common Al foam material. Besides, the dynamic damageevolution mechanism of the material has been analyzed with scanning electronmicroscope SEM experiments.Part2: investigate the law of stress wave attenuation of the sandwich-like platestructure at different impact velocity through SHPB test.Part3: employ the experiment method of crashing the foam aluminum bulletinto the sandwich-like plate structure to simulate the explosion load of thesandwich-like plate structure, on basis of which the influence of differentparameters on the dynamic response characteristic of the sandwich-like plate structure was investigated.Part4: use the explicit FEM software LS-DYNA to simulate the testsmentioned above to reproduce the test process, based on which conclusions drawnfrom the tests were verified by analyzing the parameters.