The longitudinal Mode-I fracture characteristics of laminated flattened-bamboo lumber (LFBL) were tested using the Double Cantilever Beam (DCB) method in combination with Digital Image Correlation (DIC) technology, and the effects of initial crack length (a0), specimen height (H), and specimen thickness (B) were analyzed. The results showed that crack propagation was primarily attributed to the failure of the weaker ground tissue, accompanied by fiber bridging phenomena. As B increased, the failure mode of the specimen gradually shifted from ductile to brittle failure. The a0 had no effect on the critical strain energy release rate (GIc). When B and H satisfied the conditions of B/H ≥ 0.6 and H ≥ 40 mm, GIc stabilized to a constant, suggesting it is an inherent property of the material. Among various theoretical methods, the results calculated using the Compliance Calibration (CC) method and the Modified Compliance Calibration (MCC) method were close to those obtained by the Direct Measurement (DM) method proposed in this study. The values of the longitudinal Mode-I fracture toughness of LFBL obtained in this study is: critical strain energy release rate GIc = 0.77 N/mm.
Mode-Ⅰ fracture of laminated flattened-bamboo lumbers: An experimental study based on the double cantilever beam method and DIC technology / Chen, Y.; Li, H.; Yang, D.; Xue, X.; Yuan, C.; Corbi, O.. - In: ENGINEERING FRACTURE MECHANICS. - ISSN 0013-7944. - 319:(2025). [10.1016/j.engfracmech.2025.111025]
Mode-Ⅰ fracture of laminated flattened-bamboo lumbers: An experimental study based on the double cantilever beam method and DIC technology
Corbi O.
2025
Abstract
The longitudinal Mode-I fracture characteristics of laminated flattened-bamboo lumber (LFBL) were tested using the Double Cantilever Beam (DCB) method in combination with Digital Image Correlation (DIC) technology, and the effects of initial crack length (a0), specimen height (H), and specimen thickness (B) were analyzed. The results showed that crack propagation was primarily attributed to the failure of the weaker ground tissue, accompanied by fiber bridging phenomena. As B increased, the failure mode of the specimen gradually shifted from ductile to brittle failure. The a0 had no effect on the critical strain energy release rate (GIc). When B and H satisfied the conditions of B/H ≥ 0.6 and H ≥ 40 mm, GIc stabilized to a constant, suggesting it is an inherent property of the material. Among various theoretical methods, the results calculated using the Compliance Calibration (CC) method and the Modified Compliance Calibration (MCC) method were close to those obtained by the Direct Measurement (DM) method proposed in this study. The values of the longitudinal Mode-I fracture toughness of LFBL obtained in this study is: critical strain energy release rate GIc = 0.77 N/mm.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
