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Deformation and fracture of 3D printed disordered lattice materials

Experiments and modeling

Journal Article (2019)
Author(s)

Y. Xu (TU Delft - Materials and Environment)

H. Zhang (TU Delft - Materials and Environment)

Branko Šavija (TU Delft - Materials and Environment)

S. Figueiredo (TU Delft - Materials and Environment)

E Schlangen (TU Delft - Materials and Environment)

Research Group
Materials and Environment
Copyright
© 2019 Y. Xu, H. Zhang, B. Šavija, S. Chaves Figueiredo, E. Schlangen
DOI related publication
https://doi.org/10.1016/j.matdes.2018.11.047
More Info
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Publication Year
2019
Language
English
Copyright
© 2019 Y. Xu, H. Zhang, B. Šavija, S. Chaves Figueiredo, E. Schlangen
Research Group
Materials and Environment
Volume number
162
Pages (from-to)
143-153
Reuse Rights

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Abstract

A method is presented to model deformation and fracture behavior of 3D printed disordered lattice materials under uniaxial tensile load. A lattice model was used to predict crack pattern and load-displacement response of the printed lattice materials. To include the influence of typical layered structures of 3D printed materials in the simulation, two types of printed elements were considered: horizontally and vertically printed elements. Strengths of these elements were measured: 3 mm cubic units consist of lattice elements with two printing directions were printed and their strengths were tested in uniaxial tension. Afterwards, the measured element strengths and bulk material strength, respectively, were used as model input. Uniaxial tensile tests were also performed on the printed lattice materials to obtain their crack pattern and load-displacement curves. Simulations and experimental results were comparatively analyzed. For both levels of disorder considered, only when measured strengths were assigned to the elements with identical printing direction, are the predicted crack patterns and load-displacement curves in agreement with experimental results. The results emphasize the importance of considering printing direction when simulating mechanical performance of 3D printed structures. The influence of disorder on lattice material mechanical properties was discussed based on the experiments and simulations.