Chapter 46. A Servo-Mechanical load Frame for In Situ, Noninvasive, Imaging of Damage Development
- John B. Wachtman Jr.
Published Online: 28 MAR 2008
Copyright © 1994 The American Ceramic Society
Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4
How to Cite
Breunig, T. M., Nichols, M. C., Gruver, J. S., Kinney, J. H. and Haupt, D. L. (1994) A Servo-Mechanical load Frame for In Situ, Noninvasive, Imaging of Damage Development, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - A: Ceramic Engineering and Science Proceedings, Volume 15, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314500.ch46
- Published Online: 28 MAR 2008
- Published Print: 1 JAN 1994
Print ISBN: 9780470375327
Online ISBN: 9780470314500
The X-ray tomographic microscope (XTM) is a non-invasive X-ray imaging instrument for characterizing a material's microstructure three-dimensionally with microscopic spatial resolution. We have designed a servo-mechanical load frame for use with the XTM which will allow imaging of samples under load. The load frame is capable of generating tensile or compressive forces up to 15.6 kN with a design system stiffness of 8.76×108 N/m. The test specimen can be rotated through 360°, without induced bending or torque. Torqueless motion is accomplished by synchronously rotating the grips on precision bearings with an accuracy of 0.01°. With this load frame it will be possible, for the first time, to image the initiation and accumulation of internal damage (0.5 μ detectability) formed in a 6 mm diameter specimen during the application of a monotonic or low frequency cyclic load. This is accomplished by interrupting the test and maintaining a fixed load (or displacement) during the non-invasive XTM data collection procedure. This paper describes the in situ load frame design, experimental capabilities, and preliminary results from a study of crack closure in the aluminum-lithium alloy, 2090.