Stress Wave Propagation and Energy Absorption Properties of Heterogeneous Lattice Materials under Impact Load

Cun Zhao,Dong Wang,Meng Zhang,Guoxi Li,Hao Yi

doi:10.1155/2021/1766952

Cun Zhao, Dong Wang + Show 3 more

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https://doi.org/10.1155/2021/1766952

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Abstract

A heterogeneous lattice material composed of different cells is proposed to improve the energy absorption capacity. The heterogeneous structure is formed by setting layers of body-centered XY rods (BCCxy) cells as the reinforcement in the body-centered cubic (GBCC) uniform lattice material. The heterogeneous lattice samples are designed and processed by additive manufacturing technology. The stress wave propagation and energy absorption properties of heterogeneous lattice materials under impact load are analyzed by finite element simulation (FES) and Hopkinson pressure bar (SHPB) experiments. The results show that, compared with the GBCC uniform lattice material, the spreading velocity of the stress of the (GBCC)3(BCCxy)2 heterogeneous lattice material is reduced by 18.1%, the impact time is prolonged 27.9%, the stress peak of the transmitted bar is reduced by 34.8%, and the strain energy peak is reduced by 29.7%. It indicates that the heterogeneous lattice materials are able to reduce the spreading velocity of stress and improve the energy absorption capacity. In addition, the number of layers of reinforcement is an important factor affecting the stress wave propagation and energy absorption properties.

Highlights

In recent years, with the increasing maturity of additive manufacturing technology, the development of lattice materials has been greatly promoted
Compared with the G4B1 heterogeneous lattice material, the stress peak of the transmitted bar of the G3B2 heterogeneous lattice sample is reduced by 13.4%. e comparison between Figures 5 and 9(b) shows that the experimental results are consistent with the simulation results, which proves the optimization trend of stress. e results show that, compared with the GBCC uniform lattice material, the G4B1 and G3B2 heterogeneous lattice materials can effectively reduce the stress peak of the transmitted bar
With reference to the composite structure, a heterogeneous lattice material composed of different cells is proposed. e stress wave propagation and energy absorption properties of heterogeneous lattice materials under impact load are analyzed by simulation and SHPB experiment. e experimental results are consistent with the simulation results and prove the optimization trend. e conclusions are as follows: (1) e stress wave propagation in lattice materials under impact load shows obvious periodic fluctuation and damping vibration trend

Summary

Introduction

With the increasing maturity of additive manufacturing technology, the development of lattice materials has been greatly promoted. In 2012, Cui et al [10] proposed a theoretical model based on the displacement mechanism of lattice structure to predict the dynamic response of square lattice Sandwich plate under impact loading and obtained the stressstrain curve of materials. In 2016, Mukherjee et al [17] and Zheng et al [18] studied theoretically and numerically the one-dimensional impact response and energy absorption of gradient lattice materials with different density distributions. In 2018, Babaei and Levitas [24] and Zhang et al [25] studied the influence of temperature field, thermal effect, and other factors on the stress wave behavior of lattice materials, especially the law of directional wave propagation and energy flow based on Bloch’s theorem and finite element method. Dynamic simulation shows that the added mass, prestress, and material stiffness have a significant impact on the stress wave and eigenvalues of the lattice structures

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