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Effect of crack size, thickness and span on the transverse mode I fracture characteristics of laminated flattened-bamboo lumber.

Authors :
Xue, Xin
Li, Haitao
Chen, Yue
Feng, Zixian
Mohrmann, Sarah
Yuan, Conggan
Wei, Dongdong
Xu, Wei
Corbi, Ottavia
Source :
Theoretical & Applied Fracture Mechanics. Apr2024, Vol. 130, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

To study the fracture characteristics of laminated flattened-bamboo lumber (LFBL), a transverse mode I fracture test was carried out on a single-edge notched (SEN) specimen. The failure of the specimen was analyzed at the macroscopic and microscopic levels. According to the analysis of P-CMOD curves, it was found that the entire fracture process could be divided into a linear stage, a softening stage and a failure stage, showing nonlinear elastic characteristics. Therefore, the fracture toughness K IC and tensile strength f t of the specimens were calculated by the boundary effect model (BEM) based on the nonlinear elastic fracture mechanism (non-LEFM). According to the calculation results, the influence of size change on fracture toughness K IC was analyzed. On this basis, this paper recommended the specimen size conditions for testing the mode I fracture toughness K IC of SEN specimens of LFBL in LT plane, i.e., S/W ≥ 4 and B ≥ 25 mm, thereby reducing the data dispersion caused by the change of specimen size. Finally, the mode I fracture toughness was obtained: K IC = 429.490 MPa·mm1/2. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01678442
Volume :
130
Database :
Academic Search Index
Journal :
Theoretical & Applied Fracture Mechanics
Publication Type :
Academic Journal
Accession number :
175871228
Full Text :
https://doi.org/10.1016/j.tafmec.2024.104318