The paper proposes a refined CT-based FE modelling strategy that implements a limit analysis numerical procedure, namely the Elastic Compensation Method (ECM), to estimate a lower bound to the collapse load of a human femur. In particular, the model geometry was obtained from CT images by segmentation of a fresh-frozen human cadaveric femur that was discretized with second-order tetrahedral 3D finite elements. A yield criterion of Tsai–Wutype, expressed in principal stress space, was adopted to model the bone tissues for which the strength limit values in tension, compression and shear are computed locally from the femoral density distribution also derived from CT images. The developed CT-based numerical technique showed the ability to predict, at least for the examined femur for which the experimental collapse load is available, a lower bound

A computed tomography-based limit analysis approach to investigate the mechanical behavior of the human femur prone to fracture / Falcinelli, Cristina; Pisano, Aurora Angela; Vasta, Marcello; Fuschi, Paolo. - In: MECCANICA. - ISSN 0025-6455. - 59:8(2024), pp. 1301-1313. [10.1007/s11012-024-01850-x]

A computed tomography-based limit analysis approach to investigate the mechanical behavior of the human femur prone to fracture

Pisano, Aurora Angela;Fuschi, Paolo
2024-01-01

Abstract

The paper proposes a refined CT-based FE modelling strategy that implements a limit analysis numerical procedure, namely the Elastic Compensation Method (ECM), to estimate a lower bound to the collapse load of a human femur. In particular, the model geometry was obtained from CT images by segmentation of a fresh-frozen human cadaveric femur that was discretized with second-order tetrahedral 3D finite elements. A yield criterion of Tsai–Wutype, expressed in principal stress space, was adopted to model the bone tissues for which the strength limit values in tension, compression and shear are computed locally from the femoral density distribution also derived from CT images. The developed CT-based numerical technique showed the ability to predict, at least for the examined femur for which the experimental collapse load is available, a lower bound
2024
Femur mechanics , Limit analysis, Peak load prediction, CT-based FE modelling
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12318/148226
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