Mechanical characterisation of bear bones

Detta är en Master-uppsats från KTH/Hållfasthetslära (Inst.)

Författare: Magdalena Kaplan; [2019]

Nyckelord: ;

Sammanfattning: Brown bears go into hibernation for several months during the winter period,but regain all bodily functions shortly after waking up, such as the strength ofbones. The aim of this thesis has been to characterise the material of activebear’s bones (tibiae) by destructive testing and then fitting a damage modelby the use of finite element simulations. Standard beam theory was used tocompare with the simulated results and supplemental compression testing wasconducted to verify elastic parameters. Examination of results show quite alarge distribution in both material parameters and determined stresses for thetested bones, with elastic moduli varying 3-10 GPa, Poisson’s ratio 0.3-0.45,strain for onset of damage 1-2%, damage rate factor of 25-40 and fracturestresses varying proportionally with stiffness between 50-190 MPa.

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