Dynamic viscoelastic properties of Chinese fir under cyclical relative humidity variation

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 2 Changes in local minimum or maximum value of loss factor during the cyclical relative humidity variation

Local maximum or minimum value of tanδ	Occurred sequency	Lagged time^a (min)	Value	Changing rate^b (%)
tanδ _max	1	4.85	0.0639	/
	2	4.83	0.0622	−1.88
	3	3.48	0.0607	−1.44
	4	2.96	0.0594	−1.29
	5	2.97	0.0582	−0.82
	6	3.03	0.0574	−0.66
	7	3.09	0.0573	−0.66
tanδ _min	1	4.89	0.0544	/
	2	4.85	0.0533	−2.59
	3	4.68	0.0526	−2.32
	4	4.10	0.0519	−2.24
	5	3.17	0.0515	−1.98
	6	3.22	0.0511	−1.41
	7	3.16	0.0508	−0.20

^aLagged time = \( t_{{\tan \delta_{\hbox{min} /\hbox{max} } }} - t_{{{\text{RH}}_{\hbox{min} /\hbox{max} } }} \)
^bIncreasing rate = \( ({ \tan }\delta_{{{ \hbox{min} }/{ \hbox{max} }}}^{\prime i} \; - \;{ \tan }\delta_{{{ \hbox{min} }/{ \hbox{max} }}}^{{{\prime }i - 1}} )/{ \tan }\delta_{{{ \hbox{min} }/{ \hbox{max} }}}^{{{\prime }i - 1}} \times 100\,\% \)