Effect of moisture content on bamboo?s mode I interlaminar fracture toughness: The competition between promoting and impeding crack growth

被引：10

作者：

Chen, Qi ^{[1
]}

Fei, Benhua ^{[2
,3
]}

Qi, Jinqiu ^{[1
]}

Zhang, Shaobo ^{[1
]}

Huang, Xingyan ^{[1
]}

Jiang, Yongze ^{[1
]}

Xie, Jiulong ^{[1
]}

Jia, Shanshan ^{[1
]}

机构：

[1] Sichuan Agr Univ, Coll Forestry, Chengdu, Sichuan, Peoples R China

[2] Int Ctr Bamboo & Rattan, Dept Biomat, Beijing, Peoples R China

[3] State Forestry Adm, SFA & Beijing Cobuilt Key Lab Bamboo & Rattan Sci, Beijing, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 341卷

基金：

中国国家自然科学基金;

关键词：

Fracture toughness; Bamboo; Water content; Crack propagation; Hydrated amorphous layer; MECHANICAL-PROPERTIES; PINUS-PINASTER; HUMIDITY; STRENGTH; BEHAVIOR; DENSITY;

D O I：

10.1016/j.conbuildmat.2022.127822

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Most engineering materials are chosen based on their fracture toughness rather than their strength. However, water molecules in air would interact with these materials and affect their fracture toughness, especially for the biomass materials. Bamboo is an excellent engineering material, and the effect of water content on its fracture toughness was still unknown. Thus, in this study, the effect of water on bamboo's fracture toughness was investigated, and the mechanism behind it was discussed. The results showed that the growth fracture toughness increased by 7.6 J/m2 per 1 % increase of environmental relative humidity. The effect of the water includes both promoting and impeding crack growth. The hydrated amorphous layer in cell wall impeded the propagation of cracks, while the water layer on cell wall promoted the propagation of cracks. The former effect was the stronger one in bamboo, and thus the fracture toughness increased. This competition mechanism stemmed from water was also found useful to explain the fracture properties of other kinds of materials, such as wood, stone, and clay. Therefore, a reasonable hypothesis to explain the mechanism of water content on fracture toughness of bamboo and even other materials was concluded in this study.

引用

页数：6

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