Impact of temperature on LVI-damage and tensile and compressive residual strength of CFRP

Publikationstyp
Journal Article
Date Issued
2020-11-11
Sprache
English
Author(s)
Körbelin, Johann  
Dreiner, Chiara  
Fiedler, Bodo  orcid-logo
Institut
Kunststoffe und Verbundwerkstoffe M-11  
TORE-DOI
10.15480/882.3341
TORE-URI
http://hdl.handle.net/11420/8990
Journal
Composites Part C: Open Access  
Volume
3
Article Number
100074
Citation
Composites Part C: Open Access 3: 100074 (2020)
Publisher DOI
10.1016/j.jcomc.2020.100074
Scopus ID
2-s2.0-85105341413
Publisher
Elsevier
This study investigates the influence of temperature and impact-energy on low-velocity impact damage in CFRP and the resulting residual tensile and compressive strength. Impacts were introduce d at −20 ◦C , 20 ◦C and 80 ◦C , which are moderate temperature compared to the glass transition temperature of 203 ◦C of the used CFRP. A change in temperature leads to a substantial change in damage behaviour. With increasing temperature, the delamination area is reduced, and at 80 ◦C fibre-failure occurs on the impacted side. The residual tensile strength was tested at 20 ◦C utilising a new jig, which counteracts the stresses resulting from free-edge effects and thus prevents that edge delaminations are overshadowing the effect of the impact damage due to the specimen size. The fibre failure reduces the residual tensile strength significantly compared to the damage resulting from impaction at 20 ◦C . The compressive residual strength was determined at 20 ◦C and 80 ◦C . The results point out that the temperature mainly determines the residual compressive strength. Consequently, it is essential to identify the material’s behaviour in the range of the in-service temperatures, even if they are far away from the glass transition temperature, to evaluate the damage tolerance and performance.
Subjects
Impact behaviour
Damage Tolerance
Delamination
Thermomechanical Fracture
DDC Class
500: Naturwissenschaften
530: Physik
600: Technik
620: Ingenieurwissenschaften
Funding(s)
Schadenstolerante dünnschichtige (Thin-Ply) Kohlenstofffaser-Kunststoff-Verbunde mit Graphen-verstärktem Matrixsystem  
Funding Organisations
Deutsche Forschungsgemeinschaft (DFG)  
More Funding Information
This work was carried out with funding from the German Research Foundation (DFG) within the project number 283641236 . This financial support is gratefully acknowledged.
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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