Fracture and Structural Integrity e-ISSN 1971-8993 Open access
Integrity of materials and structures Vol. 20, No. 75 (2026)

Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP

Author and affiliation details
  • Stanislav Slovikov Corresponding author Center of Experimental Mechanics, Perm National Research Polytechnic University, Russia ORCID iD0000-0003-3884-3882 sslovikov@ya.ru
  • Dmitriy Lobanov Center of Experimental Mechanics, Perm National Research Polytechnic University, Russia ORCID iD0000-0003-1948-436X
DOI
10.3221/IGF-ESIS.75.05
Pages
46-54
Published
Licence
CC BY 4.0
Published inVol. 20, No. 75 (2026)Go to the issue

Abstract

The study focuses on examining the impact of internal manufacturing defects (voids and wrinkles) on the mechanical behavior of structural carbon fiber reinforced polymers (CFRP) under shear loading.

Specimens of VKU/VSE1212 material with a [0/90]10 layup were artificially embedded with defects: circular voids (Ø 20 mm) and square voids (20×20 mm) at a concentration (area fraction) of 5.3%, as well as wrinkles increasing thickness by 10%. In-plane shear tests were conducted according to ASTM D7078 using a Vic-3D system for digital image correlation (DIC) to record strain fields. 

Results revealed that voids at 5.3% concentration (area fraction) reduced shear strength by 2.2% (from 72.1 MPa to 70.5–70.6 MPa, regardless of geometry, indicating that the defect area, rather than its shape, governs the failure response. The shear modulus of void-containing specimens (~4.48 GPa) did not differ from defect-free specimens (~4.49 GPa). Wrinkles increased the shear modulus to 5.39 GPa due to added layers but reduced strength by ~3% (to 69.9 MPa). DIC analysis confirmed the method’s efficacy for tracking strain localization in defect zones. Failure modes across all specimens involved vertical crack formation between V-notches. 

These results help systematize knowledge on of manufacturing defects on CFRP shear properties and hold practical significance for refining design tolerances in critical components, developing non-destructive testing methods, optimizing manufacturing processes.

Keywords

Article history

  1. ReceivedUntil the next stage: 0 days
  2. Revision requestedUntil the next stage: 56 days
  3. RevisedUntil the next stage: 39 days
  4. AcceptedUntil the next stage: 6 days
  5. Published

How to cite

APA

Slovikov, S., & Lobanov, D. (2025). Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP. Fracture and Structural Integrity, 20(75), 46–54. https://doi.org/10.3221/IGF-ESIS.75.05

IEEE

S. Slovikov and D. Lobanov, “Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP,” Fracture and Structural Integrity, vol. 20, no. 75, pp. 46–54, 2025, doi: 10.3221/IGF-ESIS.75.05.

MLA

Slovikov, Stanislav, and Dmitriy Lobanov. “Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP.” Fracture and Structural Integrity, vol. 20, no. 75, 2025, pp. 46–54. https://doi.org/10.3221/IGF-ESIS.75.05.

Chicago

Slovikov, Stanislav, and Dmitriy Lobanov. 2025. “Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP.” Fracture and Structural Integrity 20 (75): 46–54. https://doi.org/10.3221/IGF-ESIS.75.05.

Harvard

Slovikov, S. and Lobanov, D. (2025) ‘Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP’, Fracture and Structural Integrity, 20(75), pp. 46–54. doi: 10.3221/IGF-ESIS.75.05.

Vancouver

Slovikov S, Lobanov D. Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP. Fracture and Structural Integrity. 2025;20(75):46-54. doi:10.3221/IGF-ESIS.75.05

BibTeX

@article{slovikov2025, author = {Slovikov, Stanislav and Lobanov, Dmitriy}, title = {Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP}, journal = {Fracture and Structural Integrity}, year = {2025}, volume = {20}, number = {75}, pages = {46--54}, doi = {10.3221/IGF-ESIS.75.05}, url = {https://doi.org/10.3221/IGF-ESIS.75.05}, issn = {1971-8993} }

RIS

TY - JOUR AU - Slovikov, Stanislav AU - Lobanov, Dmitriy TI - Experimental investigation of the influence of internal defects (voids, wrinkles) on the shear properties of CFRP JO - Fracture and Structural Integrity T2 - Fracture and Structural Integrity PY - 2025 DA - 2025/10/16 VL - 20 IS - 75 SP - 46 EP - 54 DO - 10.3221/IGF-ESIS.75.05 UR - https://doi.org/10.3221/IGF-ESIS.75.05 SN - 1971-8993 ER -

Licence

Creative Commons Attribution 4.0 International

May be shared and adapted, provided appropriate credit is given. Copyright © 2025 Stanislav Slovikov, Dmitriy Lobanov.

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