杉木正交异向蠕变行为的时温等效性

doi:10.11707/j.1001-7488.20210116

Abstract

Abstract:

Objective: The aim of this study was to investigate the application of time-temperature superposition principle(TTSP) to orthotropic creep of Chinese fir(Cunninghamia lanceolata). Method: Dynamic mechanical analysis(DMA 2980) was used to determine a sequence of short-term(20 min) tensile creep for longitudinal(L), radial(R) and tangential(T) specimens with a moisture content of 0.6% in the temperature range of 30℃ to 150℃ and at three stress levels. All creep curves at other temperatures were shifted along the log time axis to superimpose them on a reference temperature(i.e. 30℃ in this study) curve. The extended isothermal creep strain master curve was over a wide range of time. The smooth master curve should ensure that not only the values of creep strain match, but also the slope. The horizontal shift factor was determined to be a function of temperature and fitted into the WLF equation and Arrhenius equation with the least squares method. Result: Creep strain increased with increasing stress and temperature for each specimen, irrespective of grain orientation. There were differences in creep strain among the specimens with three grain orientations. Creep strain for L specimen was significantly lower than that for R and T specimens, and T specimen was higher than R specimen almost twice. TTSP was well matched for R and T specimens only using horizontal shift factor to construct master curves, and the extended time scale of master curves was from 10³ s to 10⁷ s. An additional vertical shift factor was applied to construct smooth master curve of L specimen, the extended time scale of master curve was about reduced from 10⁵ s to 104.5 s. In addition, only the excellent fit of the horizontal shift factor to the WLF equation(standard error of estimate < 13.61%) was observed over the entire temperature range in all orthotropic directions. Conclusion: The validity of TTSP to characterize the creep behavior of dry wood was found in the range of 30℃ to 150℃. The TTSP were constructed for R and T specimens using horizontal shift factor, while horizontal shift factor and vertical shift factor were used for L specimen. The WLF equation provided a better fitting with horizontal shift factor in all orthotropic directions.

Key words: Chinese fir, stress level, orthotropic, time-temperature superposition principle, creep

CLC Number:

S781

Hui Peng,Jiali Jiang,Jianxiong Lü,Rongjun Zhao,Jinzhen Cao. Time-Temperature Superposition in Chinese Fir Orthotropic Creep Response[J]. Scientia Silvae Sinicae, 2021, 57(1): 153-160.

Figures/Tables 10

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References 0

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应力Stress	蠕变测试应力值Stress level/MPa
应力Stress	轴向Longitudinal	径向Radial	弦向Tangential
σ₁	1.0	0.4	0.16
σ₂	1.3	0.6	0.24
σ₃	1.6	0.8	0.32

试样 Specimens	应力值 Stress level/ MPa	WLF方程WLF equation				Arrhenius方程Arrhenius equation
试样 Specimens	应力值 Stress level/ MPa	C₁	C₂	表观活化能 Activation energy/ (kJ·mol^-1)	标准误差 Standard error (%)	表观活化能 Activation energy/ (kJ·mol^-1)	标准误差 Standard error (%)
轴向 Longitudinal	1.0	1.86	96.60	33.95	6.21	33.12	29.36
	1.3	1.71	72.02	41.66	5.97	34.56	28.53
	1.6	1.50	58.35	45.18	5.56	33.69	34.89
径向 Radial	0.4	9.75	253.15	67.74	7.34	65.04	11.98
	0.6	7.69	168.35	80.30	13.41	68.23	22.31
	0.8	7.98	156.29	89.78	13.13	74.39	28.40
弦向 Tangential	0.16	4.74	87.55	95.32	8.64	61.43	35.59
	0.24	5.90	105.28	98.49	6.12	69.68	31.26
	0.32	6.42	107.74	104.84	6.50	74.93	35.86

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Time-Temperature Superposition in Chinese Fir Orthotropic Creep Response

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