Peer-Reviewed Journal Details
Mandatory Fields
Grogan, JA,Leen, SB,McHugh, PE
2014
June
Journal Of The Mechanical Behavior Of Biomedical Materials
Computational micromechanics of bioabsorbable magnesium stents
Published
WOS: 6 ()
Optional Fields
Bioabsorbable stent Magnesium Crystal plasticity Finite element GRAIN-SIZE MECHANICAL-PROPERTIES TENSILE PROPERTIES PLASTICITY CRYSTAL DEFORMATION TEXTURE ALLOY STRUTS PERFORMANCE
34
93
105
Magnesium alloys are a promising candidate material for an emerging generation of absorbable metal stents. Due to its hexagonal-close-packed lattice structure and tendency to undergo twinning, the deformation behaviour of magnesium is quite different to that of conventional stent materials, such as stainless steel 316L and cobalt chromium L605. In particular, magnesium exhibits asymmetric plastic behaviour (i.e. different yield behaviours in tension and compression) and has lower ductility than these conventional alloys. In the on-going development of absorbable metal stents it is important to assess how the unique behaviour of magnesium affects device performance. The mechanical behaviour of magnesium stent struts is investigated in this study using computational micromechanics, based on finite element analysis and crystal plasticity theory. The plastic deformation in tension and bending of textured and non-textured magnesium stent struts with different numbers of grains through the strut dimension is investigated. It is predicted that, unlike 316L and L605, the failure risk and load bearing capacity of magnesium stent struts during expansion is not strongly affected by the number of grains across the strut dimensions; however texturing, which may be introduced and controlled in the manufacturing process, is predicted to have a significant influence on these measures of strut performance. (C) 2014 Elsevier Ltd. All rights reserved.
10.1016/j.jmbbm.2014.01.007
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