梯度多胞材料的动态力学性能分析与设计研究综述OA北大核心CSTPCD

Cellular materials are structures with a large number of internal cavities and cells,which have the properties of lightweight and high specific energy absorption,and they are widely used in the collision/explosion protection,such as aerospace,transportation,and human protection.Introducing a gradient design to cellular materials helps the materials to meet the protection requirements in different scenarios and conditions with the properties of orderly dissipation of energy and manipulation of loads.A review of research advances in the dynamic analysis and design on mechanical behavior of graded cellular materials is presented.Three cases of the applications of graded cellular materials/structures,i.e.,impact resistance,blast resistance,and blast-mimicking loading,are elaborated.Firstly,graded cellular materials are briefly described from various aspects,such as natural vs.artificial,layered vs.continuous,strength gradient vs.density gradient,and conventional manufacturing vs.additive manufacturing.The studies of the deformation characteristics,shock wave models,and protective properties of graded cellular materials under dynamic loading are then reviewed systematically.A competitive mechanism of density/strength gradients and inertial effects exists in graded cellular materials to synergistically modulate collapse deformation modes.According to the stress-strain curve characteristics of cellular materials,choosing the appropriate constitutive model could increase the characterization accuracy for its dynamic mechanical behavior.Secondly,the shock wave models are used as a mechanical tool to guide the design of graded cellular materials/structures.Some strategies are elaborated,such as the backward design of graded cellular materials for impact resistance,the design of several types of anti-blast sandwich structures,and the design of blast-load simulators with the projectile-beam coupling effect being taken into account.The optimal protection effect or precise load control had been realized efficiently,which provides a theoretical basis and technical support for the protection design and rapid evaluation of impact/explosion resistance structures.Finally,for the applications in the scenarios of extreme environmental loading,large energy impacts,and strong nonlinear load manipulation,the investigations of graded cellular materials are full of challenges and expectation.