Research on the Bending Impact Resistance and Transverse Fracture Characteristics of Bamboo under the Action of Falling Weight  

作　　者：Hao Jia Benhua Fei Changhua Fang Huanrong Liu Xiubiao Zhang Xinxin Ma Fengbo Sun 

机构地区：[1]Department of Biomaterials,International Centre for Bamboo and Rattan,Beijing,100102,China [2]SFA and Beijing Co-Built Key Laboratory of Bamboo and Rattan Science&Technology,State Forestry Administration,Beijing,100102,China

出　　处：《Journal of Renewable Materials》2023年第1期473-490,共18页可再生材料杂志（英文）

基　　金：Fundamental Research on Impact Toughness and Response Mechanism of Bamboo-woven Structural Materials Funded of International Center for Bamboo and Rattan(1632020016).

摘　　要：Drop weight impact tester was used to accurately measure the bending impact resistance of various parts of Phyllostachys edulis,commonly known as moso bamboo,with a growth cycle of 3–8 years.Cellulose crystallinity in the bottom(B),middle(M)and top(T)of bamboo at different ages was calculated using peak height analysis in X-ray diffraction.Heatmap of Spearman correlation analysis was used to represent the correlation between chemical composition and impact mechanics.The breaking load(BL),fracture energy(FE)and impact deflection(ID)of 3–8-year-old bamboo were found to be in the range of~670–2120 N,~5.17–15.55 J,and~3.60–~17.76 mm,respectively.As the growth period of bamboo rises,the cellulose crystallinity at the B and T decreases first and then increases,while that for the M increases first and then remains stable.Similarly,the bending impact performance of bamboo was found to become stable with its growth and age.The flexural impact and toughness of the 4-year-old bamboo base material were better than other specimens.The enhancement in the bending impact properties of bamboo at different growth periods was influenced by the lignin content,while the value of FE was mainly positively correlated with ash,cold and hot water extracts and benzyl alcohol content.However the content of holocellulose and pentosan,air-dry density and,base density negatively influenced the FE.With the change in the height of the bamboo,the correlation between its impact mechanical properties and chemical composition gradually decreased.This study provides data support and theoretical basis for the age-appropriate thinning and application of moso bamboo.

关 键 词：Moso bamboo LIFESPAN bending impact breaking load fracture energy impact deflection chemical composition correlation 

分 类 号：TB3[一般工业技术—材料科学与工程]