首页|Large deflection deformation behavior of a Zr-based bulk metallic glass for compliant spinal fixation application
Large deflection deformation behavior of a Zr-based bulk metallic glass for compliant spinal fixation application
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A novel compliant spinal fixation designed based on the concept of compliant mechanisms can reduce the stress-shielding effect and adjacent segment degeneration(ASD)effectively,but propose higher re-quirements for the properties of the used materials.Bulk metallic glasses(BMGs),as a kind of young biomaterials,exhibiting excellent comprehensive properties,which are attractive for compliant spinal fix-ation.Here,according to the practical service condition of the basic elements in compliant spinal fixation,large deflection deformation behaviors of Zr61Ti2Cu25Al12(at.％,ZT1)BMG beam,including elastic,yielding and plastic were investigated systematically.It was shown that the theoretical nonlinear analytical solu-tion curve as the benchmark not only with the capacity to predict the nonlinear load-deflection relation within the elastic deformation regime,but also assists to capture the yielding event roughly,which can be used as a powerful design tool for engineers.To capture the beginning of the yielding event exactly,bending proof strength(σp,0.05％)accompanied with tiny permanent strain of 0.05％was proposed and de-termined for BMGs in biomedical implant applications,which is of significance for setting the allowable operating limits of the basic flexible elements.By approach of interrupted loading-unloading cycles,plas-tic deformation driven by the bending moment can be classified into two typical stages:the initial stage which mainly characterized by the nucleation and intense interaction of abundant shear bands when the plastic strain below the critical value,and the second stage which dominated by the progressive propa-gation of shear bands and coupled with the emergence of shear offsets on tensile side.The plasticity of BMG beam structures depends on the BMG's inherent plastic zone size(rp).When the half beam thick-ness less than that of the rp,the plastic deformation of BMGs will behave in a stable manner,which can be acted as the margin of safety effectively.
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