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                <forename type="first">Huan</forename>
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                <title level="j">Composites Part B: Engineering</title>
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                <term xml:lang="en">3D printing</term>
                <term xml:lang="en">ductility</term>
                <term xml:lang="en">metamaterials</term>
                <term xml:lang="en">stents</term>
                <term xml:lang="en">tubular structure</term>
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              <p>Coronary artery disease (CAD) is the narrowing or blockage of the coronary arteries, usually caused by atherosclerosis. An interventional procedure using stents is a promising approach for treating CAD because stents can effectively open narrowed coronary arteries to improve blood flow to the heart. However, stents often suffer from catastrophic failures, such as fractures and migration of ligaments, resulting in fatal clinical events. In this work, we report a new type of tubular lattice metamaterial with enhanced mechanical resilience under radial compression, which can be used as an alternative for the current stent design. We begin by comparing the radial mechanical performance of the proposed auxetic tubular lattice (ATL) with the conventional diamond tubular lattice (DTL). Our results show that the ductility of ATL increases by 72.7% compared with that of the DTL structure. The finite element simulations reveal that the stress is more uniformly spread on the sinusoidal ligaments for ATL, while rather concentrated on the joints of straight ligaments for DTL. This phenomenon is intrinsically due to the bending of sinusoidal ligaments along both radial and axial directions, while straight beams bend mainly along the radial direction. We then investigated the effects of the geometrical parameters of the sinusoidal ligament on radial mechanical performance. Experimental results indicate that the beam depth hl has the most significant effect on the stiffness and peak load. The stiffness REVISED Manuscript (revised text marked) 2 and maximum load surge by 789% and 1131%, respectively, when hl increases from 0.15 to 0.30. In contrast, the beam amplitude Al has a minor effect on the stiffness and peak load compared to beam depth and beam thickness. However, increasing the amplitude of the sinusoidal ligament can enlarge the ductility strikingly. The ductility can increase by 67.5% if the amplitude is augmented from 0.1 Al to 0.35 Al. The findings from this work can provide guidance for designing more mechanically robust stents for medical engineering.</p>
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