Impact Response And Vibration Characteristics Of Folded Metamaterials

The Miura folded metamaterial was modeled by R-W method.Miura folded metamaterials are periodic structures with multiple closed loops in the structure,belonging to a non-tree system.In the process of modeling,by transforming the model into a topological configuration,with the hinge cut off in each closed loop,the structure becomes a derived tree system.MATLAB was used for modeling calculation,which conducted good results.At the same time,different methods of hinge cutting are studied to provide certain basis for mechanical modeling of folded metamaterials.Based on the development of folding structure,folded metamaterials possess extraordinary physical properties.ADAMS was used to analyze three typical structural models.Under the simple harmonic excitation of force and displacement,different crease stiffness affected the vibration response of Miura folded metamaterials.The results show that the Miura model of the single-degree-of-freedom structure has similar frequency response under the two kinds of excitation.By changing the crease stiffness,it can change its resonance frequency and achieve a good low-frequency vibration isolation effect.The multi-degree of freedom model can reduce the resonance frequency by increasing the number of stacks.It provides some theoretical references for vibration isolation design of Miura folding structure.The impact response of Miura folding metamaterial stack model was studied.ADAMS was used to study the impact response of different crease stiffness and damping.The results show that,under the impact load,there are two types of mechanical waves: shock wave and vibration wave.Except the first layer,the other Miura units will have the deformation characteristics of stretching before compression.The ratio between the propagation speed of mechanical waves and the maximum strain amplitude at different layers can be changed by changing the crease stiffness.Meanwhile,the response of multi-layer stacked Miura folded metamaterials is very different at steady state.The influence of damping coefficient on vibration wave is more obvious.When the shock load amplitude is changed,the response at steady state is almost constant.