Experimental investigation of transient flexural waves in beams with discontinuities of cross section |
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Authors: | M M Al-Mousawi H R Harrison |
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Institution: | (1) Department of Mechanical and CAE, North Staffordshire Polytechnic, Beaconside, ST18 0AD Stafford, England;(2) Department of Mechanical Engineering, The City University, Northampton Square, London, England |
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Abstract: | There has been little experimental work on flexural wave propagation in general and on flexural wave propagation in beams
with discontinuities of cross section in particular. Experimental data are obtained for various test beams subjected to eccentric
longitudinal impact. The bending strain versus time results are presented for several positions along a uniform beam and finite
beams (of circular cross section) with discontinuities of cross section. Bending strain histories are recorded at several
positions before and after the discontinuity. The effect of reflections on the propagated flexural wave is illustrated. The
dispersion of the traveling flexural wave caused several alternating peaks within the duration of the original positive input
pulse. The importance of investigating discontinuities of cross section in structures subjected to impact loading is clearly
manifested. |
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