Ultrasound and Wood Science at the Forestry Research Centre in Nancy, France, for a period of twenty years, between 1979 and 1999

Topical Issue - Development of European Acoustics in 20th Century

Open Access

Table 20.

Effect of fungi decay on ultrasonic velocities at 1 MHz frequency [61].

Wood species
	Treatment	Ultrasonic velocities (m/s)
		P compressional waves			S shear waves
		V₁₁	V₂₂	V₃₃	V₄₄	V₅₅	V₆₆
Beech	Initial	4909	2210	1590	865	1562	1649
Lignin attack	After 5 months white rot	4580	1759	1280	450	1391	1438
	Difference (%)	−7	−20	−19	−48	−11	−13

Pine	Initial	5565	2162	1823	617	1681	1860
Cellulose attack	After 5 months brown rot	3715	952	947	390	961	1232
	Difference (%)	−33	−56	−48	−37	−43	−34

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