NDLI: Process Mechanics in Deep Rolling of Magnesium-Calcium (MgCa) Biomaterial

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Salahshoor, M. Guo, Y. B.
Copyright Year	2011
Abstract	Magnesium-Calcium (MgCa) alloys have received considerable attention recently in medical device manufacturing industry specially in making biodegradable bone implants. Deep rolling (DR) is as a promising manufacturing technique to adjust surface characteristics of implants with the ultimate goal of being able to adjust corrosion rates of MgCa implants. Contact mechanics between rolling ball and the workpiece is essential to understand the DR process. Contact mechanics is further complicated by the normal force reduction due to hydraulic pressure loss at the tip of DR tool, and the penetration depth reduction due to elastic recovery. The measured normal force, in this study, shows maximum 23% reduction compared to theoretical value. The normal force drop is not uniform and increases with increasing applied pressure. A 2D axisymmetric, semi-infinite FEM model is developed and validated to predict the amount of elastic recovery after deep rolling. The dynamic mechanical behavior of the material is simulated using the internal state variable (ISV) plasticity model and implemented in FEM code using a user material subroutine. The simulated dent geometry agrees with the measured ones in terms of profile and depth. Simulation results suggest 8% elastic recovery on average.
Sponsorship	Manufacturing Engineering Division
Starting Page	303
Ending Page	311
Page Count	9
File Format	PDF
ISBN	9780791844304
DOI	10.1115/MSEC2011-50280
Volume Number	ASME 2011 International Manufacturing Science and Engineering Conference, Volume 1
Conference Proceedings	ASME 2011 International Manufacturing Science and Engineering Conference
Language	English
Publisher Date	2011-06-13
Publisher Place	Corvallis, Oregon, USA
Access Restriction	Subscribed
Subject Keyword	Fea Deep rolling Orthopedic biomaterial Magnesium alloy Contact mechanics Biodegradation Mechanical behavior Medical devices Magnesium alloys Alloys Finite element methods Pressure Biomaterials Manufacturing industry Geometry Finite element model Simulation results Corrosion Orthopedics Magnesium (metal) Plasticity Bone Finite element analysis Manufacturing
Content Type	Text
Resource Type	Article

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