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Description:

A new approach using a modified double cantilever beam test was proposed for evaluating the mode Ⅰ-governed critical energy release rate representative of unidirectional composite rods, defined here as the mode Ⅰ critical separation energy, 〖SE〗_IC. This approach was used to characterize basalt fiber reinforced polypropylene rods. The relation between load and displacement is obtained from loading-holding-unloading tests, where apparent crack length—defined as the straight-line distance between the loading axis and crack tip—is measured at the end of holding time of each cycle; the start of crack propagation is confirmed by in-situ digital microscope observation. Scanning electron microscope observation of fracture surface reveals matrix crack growth and fiber-matrix interfacial debonding. The linear relation between apparent crack length and cube root of compliance is obtained, and the 〖SE〗_IC calculated by the compliance method is 1.5 ± 0.5 kJ/m2.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Polypropylene, DCB, FRP rod, Separation energy, Basalt fiber

Date published: 2021-10-13

Publisher: Elsevier BV

Journal:

• COMPOSITE STRUCTURES (ISSN: 02638223) vol. 279 p. 114778-114778

Funding:

• JST Center of Innovation (COI)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4260

First published URL: https://doi.org/10.1016/j.compstruct.2021.114778

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Updated at: 2024-01-05 22:12:03 +0900

Published on MDR: 2023-11-28 13:30:27 +0900