Dynamic viscoelastic properties of Chinese fir under cyclical relative humidity variation

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Changes in local minimum or maximum value of storage modulus during the cyclical relative humidity variation

Local minimum or maximum value of E′	Occurred sequency	Lagged time^a (min)	Value (MPa)	Changing rate^b (%)
E′_min	1	4.85	5966.97	/
	2	4.83	5999.41	0.54
	3	3.48	6023.64	0.40
	4	2.96	6045.35	0.36
	5	2.97	6066.34	0.35
	6	3.03	6085.27	0.32
	7	3.09	6104.27	0.31
E′_max	1	4.89	6159.25	/
	2	4.85	6179.78	0.33
	3	4.68	6196.91	0.28
	4	4.10	6211.35	0.23
	5	3.17	6223.76	0.20
	6	3.22	6234.35	0.17
	7	3.16	6245.16	0.17

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