Experimental Study on Ultrasonic Wave Velocity and Compression Performance of Small Glued Bamboo Specimens
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摘要: 胶合竹材料作为一种竹材深加工产品，具有强度高、性能稳定、适宜工业化生产加工等特点。为深入研究胶合竹材料的力学性能，对7组共70个基材叠合方向、试件长度不同的胶合竹清材小试件进行了超声波波速检测和轴心抗压强度试验。试验结果显示，胶合竹材料具有较高强度，破坏以试件基材破坏而非胶层剥离为主。胶合基材的叠层方向对超声波速和刚度、轴压强度影响较大，超声波速与强度、弹性模量具有一定相关性，因此可以基于超声波波速指标对胶合竹试件的强度和弹性模量进行无损检测。通过各试件的抗压强度曲线可以发现，顺纹抗压试件的强度明显高于2类横纹抗压试件，后者在试验后期仍可产生获得强度提升，3类试件都具有较大的塑性变形能力，3类试件不同的力学特性可以使其应用于不同的场景。Abstract: As a deep processing product of bamboo, the glued bamboo material has the characteristics of high strength, uniform performance, good suitability for industrial production and processing. In order to study the mechanical properties of the glued bamboo materials, seven groups of 70 small glued bamboo specimens with different stacking directions and lengths were tested by ultrasonic wave velocity and axial compressive strength. The results showed that the glued bamboo material had high strength, and the main failure mode was the substrate failure rather than the delamination. The lamination direction of the glued substrate had a great influence on the ultrasonic velocity, stiffness and axial compressive strength, and the ultrasonic velocity was correlated with the strength and elastic modulus to a certain degree. Therefore, the strength and elastic modulus of the glued bamboo specimen can be non-destructively tested based on the ultrasonic wave velocity index. According to the compressive strength curve of each specimen, it can be found that the strength of the parallel compression specimen is significantly higher than that of the two other types of transverse compression specimens, the latter can still produce strength improvement in the later stage of the test, and the three types of specimens have greater plastic deformation capacity, and the different mechanical properties of the three types of specimens can make them be used in different scenarios.
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[1] 吕清芳,魏洋,张齐生,等. 新型竹质工程材料抗震房屋基本构件力学性能试验研究[J]. 建材技术与应用,2008(11):1-5. [2] 魏洋,张齐生,蒋身学,等. 现代竹质工程材料的基本性能及其在建筑结构中的应用前景[J]. 建筑技术,2011,42(5):390-393. [3] 周淑容,冯蜀逸,熊刚,等. 现代胶合木梁弯曲性能试验研究[J]. 建筑技术,2020,51(3):307-310. [4] Dackermann U, Elsener R, Li J, et al. A comparative study of using static and ultrasonic material testing methods to determine the anisotropic material properties of wood[J]. Construction and Building Materials, 2016,102:963-976.10.1016/j.conbuildmat.2015.07.195. [5] Dündar T, Wang X, As N, et al. Potential of ultrasonic pulse velocity for evaluating the dimensional stability of oak and chestnut wood[J]. Ultrasonics,2016,66:86-90.10.1016/j.ultras.2015.11.007. [6] Parveen S, Shukla D, Singh S, et al. Ultrasonic velocity, density, viscosity and their excess parameters of the binary mixtures of tetrahydrofuran with methanol and o-cresol at varying temperatures[J]. Applied Acoustics,2009,70(3):507-513.10.1016/j.apacoust.2008.05.008. [7] 张甜,程小武,陆伟东,等. 超声波法评估杉木原木力学性能研究[J]. 公路工程,2016,41(5):66-71. [8] 齐永峰,徐华东,王立海. 4种方法测木质材料动弹性模量的对比研究[J]. 森林工程,2011,27(1):19-22. [9] 张训亚,殷亚方,罗彬,等. 超声波预测落叶松规格材的抗弯性能[J]. 木材工业,2010,24(3):1-3. [10] 张训亚,殷亚方,姜笑梅. 2种无损检测法评估人工林杉木抗弯性质[J]. 建筑材料学报,2010,13(6):836-840. [11] 刘妍,张厚江. 木质材料力学性能无损检测方法的研究现状与趋势[J]. 森林工程,2010,26(4):46-49. [12] 嵇伟兵,马灵飞. 利用超声波检测杉木抗弯弹性模量[J]. 浙江林业科技,2006,26(3):21-24. [13] 田黎敏,靳贝贝,郝际平. 现代竹结构的研究与工程应用[J]. 工程力学,2019,36(5):1-18, 27. [14] 吕志涛,吕清芳,魏洋,等. 新型抗震竹质工程材料安居示范房及关键技术[J]. 特种结构,2008,35(6):129. [15] Yu Y, Liu Y, Gong M, et al. R&R study of using a stress wave timer to measure the elastic modulus of structural dimension lumber[J]. Measurement,2017,95:293-296.10.1016/j.measurement.2016.10.040. [16] 罗彬,殷亚方,姜笑梅,等. 3种无损检测方法评估巨尾桉木材抗弯和抗压强度性质[J]. 北京林业大学学报,2008,30(6):137-140. -
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