An Express Estimation of Fatigue Strength of Composite Flanges by Infrared Thermography

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Abstract

When designing structures made of polymer composite materials operating under vibration conditions, special time-consuming and long-term tests have to be carried out in order to obtain characteristics of fracture resistance due to multicycle fatigue. Full-scale parts or typical structur- al elements are tested in critical cases to take into account the influence of structural and techno- logical factors. The method of IR thermography based on the use of the self-heating effect ac- companying the appearance and accumulation of fatigue damage is actively developing to an accelerated assessment of the fatigue strength of materials. The purpose of this work is to de- velop a technique for rapid estimation of the fatigue limit of flanges made of layered polymer composite materials using the IR thermography method. The study is focused on a sample cut from a full-scale composite shell with a flange. A research technique based on block cyclic load- ing of samples using an electrodynamic vibration stand was developed. The amplitude of defor- mations of the sample in each block is maintained constant during loading, the temperature field on its surface is recorded using an IR camera. Two parameters characterizing the self-heating of the sample in each loading block were used to assess the fatigue limit: the heating rate at the beginning of the block and the value of the stabilization temperature at the end of the block. They were determined using thermograms and averaged over the most loaded zone of the sample. The heating rate at the beginning of the block and the stabilization temperature at the end of the block increase sharply when the amplitude of deformation in the loading block exceeds the fa- tigue limit. The values of the fatigue limit obtained using both of these parameters are consistent with each other and with the results of standard fatigue tests. The developed technique makes it possible to obtain an approximate express estimation of the fatigue limit of typical elements of composite structures under conditions of high-cycle fatigue.

Keywords

polymer composite materialscarbon fiber reinforced plasticflange connectionhigh-cycle fatigueinfrared thermographyfatigue limitexperimental mechanics.

Bibliography

  1. 1.Kelly A. Inzhenernyy triumf uglevolokon [The Engineer- ing Triumph of Carbon fibre] // Kompozity i nanostruktury. – 2009. – №1. – p.38-49. Scholar
  2. 2.Kablov E.N. VIAM: materialy novogo pokoleniya dlya PD-14 [VIAM: new generation materials for PD-14] // Krylya Rodiny. – 2019. – №7–8. – p.54-58. Scholar
  3. 3.Parveez, B.; Kittur, M.I.; Badruddin, I.A.; Kamangar, S.; Hussien, M.; Umarfarooq, M.A. // Scientific Advancements in Composite Materials for Aircraft Applications: A Review. – Poly- mers. – 2022. – V. 14. – p.1-12 Scholar
  4. 4.Kolobkov A.S.Polimernyye kompozitsionn-yye materialy dlya razlichnykh konstruktsiy aviatsionnoy tekhniki (obzor) [Pol- ymer composite materials for various designs of aviation equip- ment (review)]. Trudy VIAM, №6-7 (89), 2020, p.38-44. doi: 10.18577/2307-6046-2020-0-67-38-44 Scholar
  5. 5.Karimbayev T.D., Luppov A.A., Afanasyev D.V. Rabo- chiye lopatki ventilyatorov iz ugleplastika dlya perspektivnykh dvigateley. Dostizheniya i problemy [Fan blades made of carbon fiber for advanced engines. Achievements and challenges]. Dvigatel, 2011, №6 (78), ppp. 2-7 Scholar
  6. 6.Putilina P.M., Kucevich K.E., Isaev A.Yu. Polimernye kompo- zicionnye materialy na osnove uglerodnyh i steklyannyh volokon dlya izgotovleniya detalej bespilotnyh letatel'nyh apparatov i perspektivy ih razvitiya // Trudy VIAM. – 2023. – № 8 (126). – 8 S. Scholar
  7. 7.Strizhius V.E. Ocenka ustalostnoj dolgovechnosti sloistyh kompozitov s ispol'zovaniem normalizovannyh krivyh ustalosti // Materialovedenie. Energetika. – T. 26. – №3. – 2020. – S. 20-32. Scholar
  8. 8.Alam P, Mamalis D, Robert C., Floreani C., Brádaigh C. M. Ó. The fatigue of carbon fibre reinforced plastics – a review// Composites Part B. – 2019. – P. 555-579. Scholar
  9. 9.Sevenois R. D. B., Van Papegem W. Fatigue damage modeling techniques for textile composites: review and compari- son with unidirectional composite modeling techniques // Applied Mechanics Reviews. –2015. – 67. – Iss.2. 020802. Scholar
  10. 10.Talreja R. Damage Mechanics and Fatigue Life Asse- sment of Composite Materials // International Journal of Damage Mechanics. – 1999. – V.8. – p.339-354 Scholar
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Article information

Published
25 November 2024
Issue date
25 November 2024
Issue
No. 4 (2024)
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