Compressive behavior and energy absorption of polymeric lattice structures made by additive manufacturing

doi:10.1007/s11465-019-0549-7

Front. Mech. Eng.

2020, Vol. 15

Issue (2) : 319-327 https://doi.org/10.1007/s11465-019-0549-7

RESEARCH ARTICLE

Compressive behavior and energy absorption of polymeric lattice structures made by additive manufacturing

Sheng WANG¹, Jun WANG^1,²(

), Yingjie XU^1,³(

), Weihong ZHANG¹, Jihong ZHU¹

¹. State IJR Center of Aerospace Design and Additive Manufacturing, Northwestern Polytechnical University, Xi’an 710072, China
². Intelligent Materials and Structures, Unmanned System Research Institute, Northwestern Polytechnical University, Xi’an 710072, China
³. Shaanxi Engineering Laboratory of Aerospace Structure Design and Application, Northwestern Polytechnical University, Xi’an 710072, China

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Abstract

Lattice structures have numerous outstanding characteristics, such as light weight, high strength, excellent shock resistance, and highly efficient heat dissipation. In this work, by combining experimental and numerical methods, we investigate the compressive behavior and energy absorption of lattices made through the stereolithography apparatus process. Four types of lattice structures are considered: (i) Uniform body-centered-cubic (U-BCC); (ii) graded body-centered-cubic (G-BCC); (iii) uniform body-centered-cubic with z-axis reinforcement (U-BCCz); and (iv) graded body-centered-cubic with z-axis reinforcement (G-BCCz). We conduct compressive tests on these four lattices and numerically simulate the compression process through the finite element method. Analysis results show that BCCz has higher modulus and strength than BCC. In addition, uniform lattices show better energy absorption capabilities at small compression distances, while graded lattices absorb more energy at large compression distances. The good correlation between the simulation results and the experimental phenomena demonstrates the validity and accuracy of the present investigation method.

Keywords lattice structure polymer compressive behavior additive manufacturing simulation

Corresponding Author(s): Jun WANG,Yingjie XU

Just Accepted Date: 21 August 2019 Online First Date: 24 September 2019 Issue Date: 25 May 2020

Cite this article:

Sheng WANG,Jun WANG,Yingjie XU, et al. Compressive behavior and energy absorption of polymeric lattice structures made by additive manufacturing[J]. Front. Mech. Eng., 2020, 15(2): 319-327.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-019-0549-7
https://academic.hep.com.cn/fme/EN/Y2020/V15/I2/319

Fig.1 CAD models of (a) BCC and (b) BCCz. Both contain a unit cell: Uniform density (left) and graded density (right) instances.

Fig.2 Photographs of the G-BCC (left) and G-BCCz (right) lattice structures.

Fig.3 (a) Design and (b) actual setup of the quasi-static compressive test.

Fig.4 Compression simulation. (a) Geometric model; (b) finite element model.

Fig.5 Compressive deformations of U-BCC and U-BCCz lattices at different strain levels.

Fig.6 Compressive stress–strain curves of the U-BCC and U-BCCz lattice structures.

Fig.7 Layer-by-layer deformations of the G-BCC and G-BCCz.

Fig.8 Compressive stress–strain curves of the G-BCC and G-BCCz lattices.

Fig.9 Comparison with respect to the load–displacement relation between the numerical results and the experimental data: (a) The uniform density lattices; (b) the graded lattices.

Tab.1 Compressive modulus and ultimate strength of the four lattice structures

Fig.10 Evolution of the deformation behavior of the lattice structures predicted by simulation: (a) U-BCC, (b) U-BCCz, (c) G-BCC, and (d) G-BCCz.

Fig.11 Energy absorbed by the lattice structures during compression.

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