以兴安落叶松成熟材指接材为研究对象,以早晚材为基础单元,木材密度为影响木材力学变异性的主要因素,建立并验证成熟材无缺陷指接材顺纹抗拉最大破坏载荷力学模型。模型验证结果表明:利用该模型能够准确求解齿长为27.5 mm、齿底为7.5 mm、齿顶为2.25 mm、齿斜面与齿底夹角为95°,且具有3个胶合面的兴安落叶松成熟材无缺陷指接材顺纹抗拉破坏载荷; 但该模型不适用于预测幼龄材,对其指接材顺纹抗拉破坏载荷计算偏差较大。为推广该模型,需补充与兴安落叶松幼龄材相关的模型参数,并需进一步对不同齿形参数的指接材进行验证。
Abstract
To establish and verify the longitudinal tensile failure load(LTF)mechanical model of Larix gmelinii mature finger-jointed wood, the properties of earlywood(EW)and latewood(LW)were involved. In addition, it considered density as the major factor influencing Larix gmelinii mature wood mechanical properties. The verification results of the model showed that it was possible to build mechanical model of LTF based on different properties of EW and LW. The model of finger-jointed LTF was suitable for Larix gmelinii mature wood, which was verified by the specimen with the node geometric parameters including 27.5 mm of the length, 7.5 mm of the bottom, 2.25 mm of the top, and the angle of 95° between slope and bottom. However, it couldn’t predict the LTF of Larix gmelinii juvenile wood. In order to promote the model, it required more verification of various finger-joint figures.
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基金
收稿日期:2013-08-05 修回日期:2013-12-26
基金项目:国家林业公益性行业科研专项项目(201104027)
第一作者:郭莹洁,博士。*通信作者:任海青,研究员。E-mail: Renhq@caf.ac.cn。
引文格式:郭莹洁,赵荣军,钟永,等. 兴安落叶松成熟材指接材抗拉破坏载荷力学模型[J]. 南京林业大学学报:自然科学版,2014,38(5):20-24.
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