Fractography and Non-Destructive evaluation of fatigue damage in GFRP composites using natural frequency

Authors

1 Ph.D. Student, Ferdowsi University of Mashhad, Sun Air Research Institue, Department of Mats. Sci. and Eng., Mashhad, Iran

2 Assoc. Prof., Ferdowsi University of Mashhad, Sun Air Research Institue, Department of Mats. Sci. and Eng, Mashhad, Iran

3 Prof., Ferdowsi University of Mashhad, Smart and Composite Structures Lab, Department of Mech. Eng., Mashhad, Iran

Abstract

Fatigue testing of composite structures is a destructive, costly and time-consuming process. In the search for a non-destructive procedure to predict the life of fiber reinforced polymer composites under cyclic loading, modal analysis has been proposed. Residual strength is considered as a popular indicator of damage accumulation and used in life prediction models. The relation between the residual strength and the modal parameters has been studied and reported. Results showed that with damage accumulation over fatigue cycling, a 20% decrease in residual strength (from 415 to 330MPa) corresponded to a 12% decrease in natural frequency (from 30.5 to 27Hz). Investigation of the fracture surfaces of fatigued specimens showed different failure micro-mechanisms for different maximum fatigue stress levels. The first mode of natural frequency not only followed the changes of residual strength with damage accumulation but also could reflect the structural changes and alteration of failure micro-mechanisms at different maximum stress levels. This paper focuses on how varying fatigue stress levels affect the failure micro-mechanisms and the relationship between these damages, residual strength and natural frequency. At lower maximum stress levels, more failure micro-mechanisms were activated and the changes in the first mode of natural frequency were more pronounced. This suggests that natural frequency is sensitive enough to detect different fatigue micro-mechanisms and could be used as an independent, non-destructive parameter for fatigue damage assessment.

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Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 14, Issue 5
November and December 2024
Pages 53-66

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