Abstract
Fatigue load monitoring is a useful tool for safety assessment of highway bridges. Monitoring has been conventionally done using strain gages. Installation of these gages is labor-intensive and requires safety precautions. Noncontact electromagnetic-acoustic transducers (EMATs) offer an attractive alternative. EMATs were used to transmit and receive Rayleigh Waves (RW). Changes in time of flight of RW due to the acoustoelastic effect can in principle be used to monitor stresses resulting from vehicular traffic. We have performed proof-of-concept experiments to demonstrate the feasibility of this approach. Specimens were subjected to bending to simulate the load environment in bridges. RW EMATs were used to measure the relatively low stresses (less than 14 MPa) typically experienced by bridge girders. The signal-to-noise ratio achievable with our system should allow adequate stress resolution for fatigue load monitoring. Factors which could impede technology transfer were considered. The primary obstacle appears to be variability in time of flight (TOF) due to magnetostriction. If the magnetic state is changed (e.g., by scanning of the EMATs) the TOF can change, even at constant stress. We have characterized this effect. If a proper installation procedure is followed, fatigue load monitoring with RW EMATs is feasible.
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References
United States Department of Transportation (USDOT), Federal Highway Administration, Secretary of Transportation: Report to Congress: The Status of the Nation's Highways: Condition and Performance, Technical Report Senate Document 99-6, U.S. Government Printing Office, Washington, D.C. (1985).
United States Department of Transportation (USDOT), Federal Highway Administration, Highway Bridge Replacement and Rehabilitation Program: Sixth Annual Report to Congress, Technical Report Senate Document 99-12, U.S. Government Printing Office, Washington, D.C. (1985).
W. T. McKeel, C. E. Maddox, H. L. Kinnier, and C. F. Galambos, Loading History Study of Two Highway Bridges in Virginia, Highway Research Record No. 382, Highway Research Board (1972).
P. B. Keating, J. M. Kulicki, D. R. Mertz, and C. R. Hess, Economical and Fatigue Resistant Steel Bridge Details, Participant Notebook, National Highway Institute Course No.: 13049, June (1990).
G. R. Cudney, The Effects of Loading on Bridge Life, Michigan Department of State Highways, Res. Rept. R-638.
D. S. Hughes and J. S. Kelly,Phys. Rev. 92(5): 1145, (1953).
D. Crecraft,Ultrasonics 6(2):117 (1968).
M. Hirao, H. Ogi, and H. Fukuoka,Res. Nondestr. Eval. 5:211 (1994).
A. Brokowski and J. Deputat, Ultrasonic Measurements of Residual Stresses in Rails, Proc. Eleventh World Conf. on Nondest. Test., Vol. 1, p. 592, Las Vegas, NV (1985).
H. Fukuoka, H. Toda, K. Hirakawa, H. Sakamoto, and Y. Togo, inAcoustoelastic measurement of residual stresses in the rim of railroad wheels, Wave Prop. in Inhomogeneous Media and Ultrasonic Nondestructive Evaluation (Vol. 6), G. C. Johnson, ed. (ASME, New York, 1984), p. 185.
E. R. Schneider, R. Herzer, D. Busche, and H. Frotscher, Reliability Assessment of Railroad Wheels by Ultrasonic Stress Analysis, Third European Conf. on Residual Stress, Nov. 4–6, Frankfurt, FRG (1992).
R. E. Schramm, A. V. Clark, and T. J. McGuire, Ultrasonic Measurement of Residual Stress in Railroad Wheel Rims, Proc. Tenth Int. Wheelset Conf., p. 151, The Inst. of Engineers, Australia, Nat. Conf. Pub. No. 92/10, Sydney (1992).
R. B. Thompson, W.-Y. Lu, and A. V. Clark, SEM Monograph in Techniques for Residual Stress Measurement: Chapter 7, Ultrasonic Techniques, to be published by the Society for Experimental Mechanics.
C. C. Spyrakos and I. Latheef, Experimental Evaluation of Dynamic Load Factor on Highway Bridges, W VA University Rep. No. CFC-92-136.
P. P. Christiano, L. E. Goodman, and C. N. Sun, Bridge Stress-Range History, Highway Research Record No. 382, Highway Research Board (1972).
P. Fuchs, unpublished results.
M. Hayes and R. S. Rivlin,Arch. Rat. Mech. Anal. 8:358 (1961).
M. Hirao, H. Fukuoka, and K. Hori,J. Appl. Mech. 48:119 (1981).
Y. Iwashimizu, and O. Kobori,J. Acoust. Soc. Am. 64(3):910 (1978).
P. P. Delsanto and A. V. Clark,J. Acoust. Soc. Am. 81(4):952 (1987).
R. T. Smith, R. Stern, and R. W. B. Stephens,J. Acoustic Soc. Am. 40(5):1002 (1966).
H. M. Frost,Physical Acoustics, Vol. XIV (Academic Press, New York, 1979), p. 179.
R. B. Thompson,Physical Acoustics, Vol. XIX (Academic Press, New York, 1988), p. 157.
R. B. Thompson,IEEE Trans. Sonics Ultrasonics SU-25(1):7 (1978).
I. V. Il'in and A. V. Kharitonov,Sov. J. NDT 16:549 (1980).
A. Wilbrand, inRev. Prog. Quant. Nondest Eval., Vol. 7, D. O. Thompson and D. E. Chimenti, eds. (Plenum Press, New York, 1988), p. 671.
H. Kwun,J. Appl. Phys. 57(5):1555 (1985).
M. Namkung, D. Utrata, S. G. Allison, and J. S. Heyman, inReview of Progress in Quantitative NDE, Vol. 5B, D. O. Thompson and D. E. Chimenti, eds. (Plenum, New York, 1986), p. 1489.
C. M. Fortunko, G. L. Peterson, B. B. Chick, M. C. Renken, and A. L. Preis,Rev. Sci. Instr. 63:3477 (1992).
A. V. Clark, C. M. Fortunko, M. G. Lozev, S. R. Schaps, and M. C. Renken,Res. Nondestr. Eval. 4(3):165 (1992).
A. V. Clark and S. R. Schaps, Acoustoelastic Determination of Residual Stress by Measurement of Resonance Peaks and Phase Shifts, manuscript in preparation.
M. Hirao, H. Fukuoka, and Y. Murakami,Res. Nondestr. Eval. 4(3):127 (1992).
A. V. Clark and Y. Berlinsky,Res. Nondestr. Eval. 4:79 (1992).
R. E. Schramm, A. V. Clark, D. V. Mitrakovic, S. R. Schaps, and T. J. McGuire, Residual Stress Detection in Railroad Wheels: An Ultrasonic System Using EMATs, NISTIR No. 3968, Nat. Inst. of Standards and Technology, Gaithersburg, MD (1991).
Y. Beers,Introduction to the Theory of Error, Sec. V.B (Addison-Wesley, Reading, MA 1953).
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Clark, A.V., Fuchs, P. & Schaps, S.R. Fatigue load monitoring in steel bridges with Rayleigh Waves. J Nondestruct Eval 14, 83–98 (1995). https://doi.org/10.1007/BF01183114
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DOI: https://doi.org/10.1007/BF01183114