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Geometric strut optimisation of as-manufactured AlSi10Mg lattice structures for enhanced energy absorption
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DOI：10.1108/rpj-07-2024-0291.png)
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Abstract
En 中文
<jats:sec>
<jats:title>Purpose</jats:title>
<jats:p>The paper aims to evaluate the energy absorption properties of optimised strut cross-section AlSi10Mg lattice structures fabricated by laser powder bed fusion (PBF-LB) additive manufacturing (AM). Quasi-static evaluations indicate a transformation in deformation behaviour of lattices with increasing optimisation which supports strong energy absorption capabilities.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Design/methodology/approach</jats:title>
<jats:p>The paper applies a novel strut element optimisation method using a hybrid continuum-beam finite element model to improve energy absorption in metal lattice structures. Impact testing occurs on laser powder bed fusion (PBF-LB) fabricated aluminium alloy (AlSi10Mg) lattices specimens to validate the approach.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Findings</jats:title>
<jats:p>The study provides both a qualitative and quantitative understanding on how PBF-LB AlSi10Mg lattices behave at high strain rates and how strut geometry can be manipulated to produce superior as-manufactured structures.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Research limitations/implications</jats:title>
<jats:p>The qualification of structures produced by AM is dependent on material, structure and process technology. Further evaluation of geometric and topologic derivatives of the presented structures is required.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Practical implications</jats:title>
<jats:p>The paper demonstrates the refinement of lattice structures for the use as metamaterials with unique properties unattainable through conventional material science.</jats:p>
</jats:sec>
<jats:sec>
<jats:title>Social implications</jats:title>
<jats:p>The efficient distribution of lattice material reduces unnecessary material expenditure. Structural optimisation provides the means to further reduce expenditure for high value applications such as crash safety and biomedicine.</jats:p>
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<jats:title>Originality/value</jats:title>
<jats:p>This study provides a method to elicit different behaviours and properties in metal lattice structures, which may lead to wide reaching applications as they become more common in engineering industry. It also provides a direct evaluation of mechanical properties of optimised metal lattice structures.</jats:p>
</jats:sec>
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