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Licensed Unlicensed Requires Authentication Published by De Gruyter July 21, 2016

Application of TTSP to wood-development of a vertical shift factor

  • Fuli Wang , Tianlai Huang and Zhuoping Shao EMAIL logo
From the journal Holzforschung


The applicability of the time-temperature superposition principle (TTSP) to wood has been investigated aiming at the prediction of long-term mechanical properties of wood by both horizontally and vertically shifting of short-term stress relaxation data obtained by experiments. The expression of TTSP considering the vertical shift factor (bT) for wood is proposed the first time. The results showed that: (1) TTSP applied to poplar and the master curve that was obtained from 1 h of tests at 283.2, 303.2, 320.2, 343.2, and 363.2 K in a relative humidity (RH) of 60% could predict the stress relaxation behavior for approximately 42 years at 283.2 K and 60% RH. (2) There was a linear correlation between lgaT and T-1, lg aT=6590.40 T-1-23.64 (R2=0.994), which followed the Arrhenius equation well, while the apparent activation energy was 34.6 kcal mole-1. (3) The bT had a linear relationship with temperature, and the relation was lgbT=0.0013T-0.37 (R2=0.999). (4) The long-term relaxation curve of the long-term verification test had high goodness of fit with the master curve. The results can be interpreted that the TTSP expression considering the bT proposed in this paper is rational.

Award Identifier / Grant number: 11008250

Funding statement: The study was supported by National Natural Science Foundation of China (No. 11008250)


The study was supported by National Natural Science Foundation of China (No. 11008250).


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Received: 2016-5-13
Accepted: 2016-6-19
Published Online: 2016-7-21
Published in Print: 2017-1-1

©2017 Walter de Gruyter GmbH, Berlin/Boston

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