Abstract
Bilinear delamination failure criteria proposed by Reeder for mixed-mode (I–II) fracture of composite laminates has four limitations: require mixed-mode (I–II) fracture data by the more complex MMB test; determination of bilinear constants by two independent curve fits; failure of bilinear equations to intersect at \(\hbox {G}_{\mathrm{I}}^{\mathrm{m}}/\hbox {G}_{\mathrm{II}}^{\mathrm{m}}=1\); and the data representation by \(\hbox {G}_{\mathrm{I}}^{\mathrm{m}}\) versus \(\hbox {G}_{\mathrm{II}}^{\mathrm{m}}\) instead of the conventional \(\hbox {G}_{\mathrm{c}}^{\mathrm{m}}\) versus \(\hbox {G}_{\mathrm{II}}^{\mathrm{m}}/\hbox {G}_{\mathrm{T}}\). Some of these limitations were overcome by limited input bilinear criteria (LIBC) proposed by Davidson and Zhao by replacing the MMB test data by DCB, ENF, and SLB (single leg beam) test data. But the LIBC retained the two discontinuous forms of the equations for no specific reason in a continuous material system. This paper eliminates the two equations by a single power law equation that covers the whole domain of fracture as in Benzeggagh and Kenane’s empirical equation. This simplified mixed-mode delamination fracture criterion we call “Limited Input B–K (LIBK) criterion in recognition of the works of Davidson and Zhao, and Benzeggagh and Kenane. The criterion was validated by a large number of test data in the literature.
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Acknowledgements
The first author thanks the staff and faculty of the Center for Composite Materials Research and the Department of Mechanical Engineering for their financial support during this research. Special thanks to Mr. Matthew Sharpe, Composite Materials Lab Manager, for his support in fabricating composite laminates and preparation of the test specimens and testing. The first author also thanks the support from the Joint School of Nanoscience and Nanoengineering at North Carolina A&T State University through the National Science Foundation (ECCS-1542174) grant. The second author acknowledges the financial support of NASA through URC Grant Number NNX09AV08A.
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Karnati, S.R., Shivakumar, K. Limited Input Benzeggagh and Kenane delamination failure criterion for mixed-mode loaded fiber reinforced composite laminates. Int J Fract 222, 221–230 (2020). https://doi.org/10.1007/s10704-019-00418-1
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DOI: https://doi.org/10.1007/s10704-019-00418-1