Fig. 1 Guided wave Generation in a plate
Fig. 2 Torsional and longitudinal transducers in a module
Fig. 3 Wave propagation simulation of torsional mode and flexural mode
Fig. 4 Reflection from a series of defects
Fig. 5 Axisymmetric and non-axisymmetric feature
Fig. 6 Group velocity of 3/4" pipe and frequency Regime
Fig. 7 Guided wave system for Measurement
Fig. 8 The geometric of pipe specimen
Fig. 9 Experimental result of frequency Regime –6
Fig. 10 Experimental result of frequency Regime +4
Fig. 11 Experimental result of reverberation technique
Fig. 12 Amplitude values about depth of the defects
Table 1 Specification of the Specimen
References
- D. N. alleyne and P. Cawley., 1997, " Long Range Propagation of Lamb Waves in Chemical Plant Pipework", Materials Evaluation, Vol. 52, No. 7, pp. 504-508
- D.N. alleyne and P. Cawley., 1992, "Optimization of Lamb wave inspection Techniques", NDT & E International, Vol. 25, pp. 11-22 https://doi.org/10.1016/0963-8695(92)90003-Y
- P. Cawley, M. J. S. Lowe, D.N. Alleyne, B. Pavlakovic and P. Wilcos., 2003, "Practical Long Range Guided Wave Testing: Application to Pipe and Rail", Material Evaluation, 61(1), pp. 66-74
- D.N. Alleyne, B. Pavlakovic, M.J.S. Lowe and P. Cawley., 2001, "Rapid long-range inspection of chemical plant pipework using guided waves" Review of Progress in Quantitative NDE, ed. by D. O. Thompson and D. E. Chimenti (Plenum, NewYork), 20, pp.180-187
- Brian Pavlakovic and Mike Lowe., 2001, "A System for Generating Dispersion Curve" user's manual, Version 2.0.11. pp. 20-60