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2.3 MECHANICAL ENGINEERING, Materials engineering, Medical engineering
An expandable rigid PU foam can turns into complex shapes, with a shell like structure onthe outside and honeycomb structure on the inside, which can be easily shaped to a vertebraform. The present study aims to determine whether expandable rigid polyurethane foamwas an appropriate substitute for rigid block polyurethane foam to model the trabecularbone. Static compression tests were performed to determine compressive moduli and yieldstresses on three polyurethane foam densities namely 0.16 g/cm3, 0.24 g/cm3and 0.42 g/cm3.Morphology of the PU foams for all densities was also observed. The compressive modulusfor 0.16 g/cm3and 0.24 g/cm3were found varied from 40 to 43 MPa and 83 to 92 MPa whileyield stress ranged from 2.1 to 2.3 MPa and 3.4 to 4.8 MPa respectively. As for 0.42 g/cm3, thecompressive modulus and yield stress varied from 240 to 256 MPa and 38 to 40 MPa. Based onthese results, the compressive modulus and yield stress of 0.24 g/cm3compared favourablywith rigid block PU foam and human cadavers presented in the literatures. Hence, the find-ings of this study could potentially be used in developing a synthetic vertebral trabecularbone of paediatric spine for biomechanical testing.
Basaruddin, K.S., et al. (2020) Evaluating Compressive Properties and Morphology of Expandable Polyurethane Foam for use in a Synthetic Paediatric Spine, Journal of Materials Research & Technology, 2020 ;9(2):2590–2597. DOI: 10.1016/j.jmrt.2019.12.089