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In-Situ Sensing of the Expansion of Low Density Core (LDC) Ti-6Al-4V Sandwich Structures

Published online by Cambridge University Press:  10 February 2011

D. T. Queheillalt ,
B. W. Choi ,
H. N. G. Wadley  and
D. S. Schwartz
D. T. Queheillalt
Affiliation:
IPM Laboratory, University of Virginia, Charlottesville, VA 22903, dtq2j@virginia.edu
B. W. Choi
Affiliation:
IPM Laboratory, University of Virginia, Charlottesville, VA 22903, dtq2j@virginia.edu
H. N. G. Wadley
Affiliation:
IPM Laboratory, University of Virginia, Charlottesville, VA 22903, dtq2j@virginia.edu
D. S. Schwartz
Affiliation:
The Boeing Company, St. Louis, MO 63166-0516
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Abstract

A combination multifrequency eddy current and laser ultrasonic sensors have been used to measure the pore expansion kinetics and elastic moduli evolution during the annealing of low density core (LDC) Ti-6Al-4V sandwich structures. The LDC samples were heated to 920°C and held there for up to 12 hr. The eddy current sensor measured the sample thickness (i.e. relative density) and revealed that the samples began to expand early during heating and was nearly complete after 4 hr at 920°C. The laser ultrasonic sensor measurements indicated a concomitant decrease in the elastic moduli with the reduction in relative density. The combination of an eddy current and laser ultrasonic sensor is therefore able to measure both the density and the elastic moduli independently during the annealing stage of LDC Ti-6Al-4V sandwich structure processing providing a simple method for directly controlling the parameters most critical to aerospace applications of these new materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 521: Symposium R – Porous & Cellular Materials for Structural Applications , 1998 , 243
Copyright
Copyright © Materials Research Society 1998

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References

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