Comparison of Full Field Strain Distributions to Predicted Strain Distributions from Limited Sets of Measured Data for SHM Applications

Abstract:

Measured data from operating systems are often acquired to predict structural health of a system. With only a few measurement sensors, very limited understanding of the system can be obtained. Utilizing some recent novel expansion results, full field information can be obtained to identify a more complete strain description for the system. Using these results in conjunction with an analytical prediction of the expected strains, comparisons and differences can be identified using time response data. The expected full field stress-strain from the analytical model is compared to the predicted full field dynamic stress strain from limited sets of measured locations due to either operating or imposed loading on the structure. Differences in strain distributions at many time increments can provide indications of regions of possible damage in the structure. The work presented in this paper identifies the methodology as well as some results to illustrate the usefulness of the approach.

• Periodical: Key Engineering Materials (Volumes 569-570)
• Pages: 1140-1147
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.569-570.1140
• Online since: July 2013
• Authors: Peter Avitabile, Eric Harvey, Justin Ruddock
• Keywords: Damage Assessment, Structural Health Monitoring (SHM)

References

[1] Farrar, C.R., Sohn, H., Hemez, F.M., Anderson, M.C., Bement, M.T., Cornwell, P.J., Doebling, S.W., Schultze, J.F., Lieven, N., Robertson, A.N., Damage Prognosis: Current Status and Future Needs, Los Alamos National Laboratory Report, LA-14051-MS, (2004).

[2] H. Sohn. C.R. Farrar, F. M. Hemez, D. D. Shunk, S. W. Stinemates, B. R. Nadler and J. J. Czarnecki, A Review of Structural Health Monitoring Literature form 1996-2001, Los Alamos National Laboratory report LA-13976-MS (2004).

[3] Chipman,C., Expansion of Real Time Operating Data", Master, s Thesis, University of Massachusetts Lowell, May (2009).

[4] Pingle,P., Prediction of Full-Field Dynamic Stress-Strain from Limited Sets of Measured Displacement Data, Doctoral Thesis, University of Massachusetts Lowell, August (2010).

[5] Guyan, R.J., Reduction of Stiffness and Mass Matrices, AIAA Journal, Vol. 3, No 2, (1965).

[6] Paz, M, Dynamic Condensation, AIAA Journal, Vol22, No 5, May (1984).

[7] O'Callahan J.C., Avitabile,P., Riemer,R., System Equivalent Reduction Expansion Process, Seventh International Modal Analysis Conference, Las Vegas, Nevada, February (1989).

[8] Kammer, DC, A Hybrid Approach to Test Analysis Model Development for Large Space Structures, Journal of Vibration and Acoustics, Vol 113, July (1991).

DOI: 10.1115/1.2930188

[9] FEMAP – Finite Element Modeling And Postprocessing, Version 10. 0. 2, Siemens Product Lifecycle Management Software Inc.

[10] NX Nastran 6, Siemens Product Lifecycle Management Software Inc.

[11] FEMtools 3 – Dynamic Design Solutions, Leuven, Belgium.