Research Papers

Formability of Porous Tantalum Sheet-Metal

[+] Author and Article Information
Paul S. Nebosky

Department of Aerospace and Mechanical Engineering,  University of Notre Dame, Notre Dame, IN 46556pnebosky@sitesmedical.com

Steven R. Schmid1

Department of Aerospace and Mechanical Engineering,  University of Notre Dame, Notre Dame, IN 46556schmid.2@nd.edu


Corresponding author.

J. Manuf. Sci. Eng 133(6), 061006 (Dec 01, 2011) (5 pages) doi:10.1115/1.4005353 History: Received October 28, 2010; Revised October 21, 2011; Published December 01, 2011; Online December 01, 2011

Over the past 10 years, a novel cellular solid, Trabecular MetalTM (TM), has been developed for use in the orthopedics industry as an ingrowth scaffold. Manufactured using chemical vapor deposition (CVD) on top of a graphite foam substrate, this material has a regular matrix of interconnecting pores, high strength, and high porosity. Manufacturing difficulties encourage the application of stamping and forming technologies to increase CVD reactor throughput and reduce materials wastes. In this study, the formability of TM was evaluated using a novel camera-based system for measuring surface strains, since the conventional approach of printing or etching gridded patterns was not feasible. A forming limit diagram was then obtained using specially fabricated 1.65 mm thick sheets. No lubricant was used due to the cleanliness requirements for orthopedic implants.

Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

The EPOCHTM hip implant. This hip replacement consists of a cobalt-chrome core surrounded by a PEAK layer so that its stiffness matches that of bone. The PEAK layer partially penetrates the ingrowth pads during molding. The ingrowth pads are a shape that requires more complicated strains than simple bending in order to produce them.

Grahic Jump Location
Figure 7

The minor strain field for specimen 18 at stage 64

Grahic Jump Location
Figure 6

The major strain field for specimen 18 at stage 64, just prior to cracking

Grahic Jump Location
Figure 5

Forming-limit curves for Trabecular MetalTM

Grahic Jump Location
Figure 4

Trabecular MetalTM specimens. (a) A specimen that showed little formability. Note the visibly striated surface. (b) A sample that showed good formability.

Grahic Jump Location
Figure 3

The experimental setup for the hemispherical punch tests

Grahic Jump Location
Figure 2

The optical arrangement of the ARAMIS system. If the camera position and angle between the cameras are known, the spatial object point P(X,Y,Z) can be determined from the corresponding two-dimensional image points p1 (x1 ,y1 ) and p2 (x2 ,y2 ) [10].



Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In