水热环境中马尾松早材和晚材的轴向拉伸力学行为

doi:10.11707/j.1001-7488.LYKX20220751

Abstract

Abstract:

Objective: This paper is proposed to investigate the longitudinal tensile mechanical behavior of earlywood (EW) and latewood (LW) of Pinus massoniana in the hydrothermal environment, with an aim to reveal the mechanism about the softening behavior of wood at the scale of growth ring. Method: The absolute dry density of EW and LW in the 17^th growth ring of the heartwood of Pinus massoniana was measured by X-ray profile densimeter. LR-EW and LR-LW tissue sections were obtained from radial (LR) section of EW and LW, and LT-EW and LT-LW tissue sections were obtained from tangential (LT) section of EW and LW by a slide slicing machine. The microfiber angle (MFA), tensile elastic modulus, tensile strength and tensile strain rate of LR-EW, LR-LW, LT-EW and LT-LW specimens were measured by X-ray diffractometer and dynamic mechanical analysis at 30, 40, 50, 60, 70 and 80 ℃, respectively. Result: 1) The absolute dry density of LW (0.836 g·cm³) was 2.2 times higher than EW (0.388 g·cm³). At each temperature, the MFA of EW was larger than that of LW, and the MFA of specimen in the LR section was larger than that in the LT section. The MFA of water-saturated EW and LW in the LR and LT sections decreased with the increase of temperature. 2) At temperature level of 30 ℃, the tensile elastic modulus of LW in the LR section was manifested that LW was 2.1 times higher than EW, the tensile elastic modulus of LW in the LT section was manifested that LW was 3.3 times higher than EW, respectively. Among the four tissue sections, the tensile strength of LT-LW was the highest; the tensile strength of LR-LW was 2.0 times higher than LR-EW. Absolute dry density and MFA are two key factors affecting the tensile mechanical behavior of EW and LW in the LR and LT sections. 3) When the temperature rose from 30 ℃ to 80 ℃, the tensile elastic modulus and tensile strength of LR-EW, LR-LW, LT-EW and LT-LW were decreased, the decline of tensile elastic modulus and tensile strength of EW was greater than that of LW, and the decline of tensile elastic modulus and tensile strength of specimen in the LT section was greater than that of in the LR section. The tensile elastic modulus and tensile strength of LR-EW, LR-LW, LT-EW and LT-LW of the temperature of turning point was 60 ℃, which was related to the softening of lignin in the wood cell wall. 4) At each loading rate (0.5, 1.0, 2.0 N·min^?1), the tensile strain rate of LR-EW, LR-LW, LT-EW and LT-LW were decreased with the increase of temperature. At the same temperature and loading rate, the tensile strain rate of EW in the LR section was about 2.0 times higher than that of LW, the tensile strain rate of EW in the LT section was about 3.3 times higher than that of LW, respectively. When the loading rate was doubled, the tensile strain rate of specimens showed a doubling trend. Conclusion: The MFA, tensile elastic modulus and tensile strength of LR-EW, LR-LW, LT-EW and LT-LW decreased with the increase of temperature. Compared with LW, the influence of temperature on the tensile modulus and tensile strength of EW was greater. The decline of tensile modulus was inhibited by the decrease of MFA with the increase of temperature, and while the lignin softening was the main factor affecting the decrease of the tensile modulus and tensile strength in the hydrothermal environment above 60 ℃.

Key words: Pinus massoniana, earlywood, latewood, hydrothermal environment, longitudinal tension

CLC Number:

S781.2

Yuan Li,Zhu Li,Yamin Du,Jiali Jiang. Longitudinal Tensile Mechanical Behavior of Earlywood and Latewood of Pinus massoniana in the Hydrothermal Environment[J]. Scientia Silvae Sinicae, 2024, 60(8): 184-192.

Figures/Tables 7

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温度Temperature/℃	LT-EW		LR-EW		LT-LW		LR-LW
温度Temperature/℃	微纤丝角 MFA/(°)	变异系数 CV(%)	微纤丝角 MFA/(°)	变异系数 CV(%)	微纤丝角 MFA/(°)	变异系数 CV(%)	微纤丝角 MFA/(°)	变异系数 CV(%)
30	15.28	2.47	10.73	3.80	12.37	1.98	9.79	1.77
40	15.10	5.31	10.50	5.06	12.35	4.28	9.82	2.78
50	15.07	6.62	10.31	5.73	12.34	3.29	9.54	6.02
60	14.79	6.66	10.17	5.75	12.33	3.63	9.09	2.61
70	14.34	7.10	10.03	4.52	12.28	6.33	8.88	5.95
80	14.12	4.58	10.05	5.35	12.25	2.15	8.84	0.90

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Longitudinal Tensile Mechanical Behavior of Earlywood and Latewood of Pinus massoniana in the Hydrothermal Environment

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