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。
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.
作者
周年强
陈国
赵龙龙
ZHOU Nian-qiang;CHENG Guo;ZHAO Long-long(School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)
出处
《竹子学报》
2020年第1期46-52,共7页
Journal of Bamboo Research
基金
国家自然科学基金项目(51408312)。
关键词
胶合竹
清材小试件
无损检测
超声波波速
抗压强度
轴压性能
Glued bamboo
Small clear specimens
Nondestructive testing
Ultrasonic wave velocity
Compressive strength
Axial compression performance
