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Publisher DOI: 10.1016/j.jcomc.2020.100074
Title: Impact of temperature on LVI-damage and tensile and compressive residual strength of CFRP
Language: English
Authors: Körbelin, Johann 
Dreiner, Chiara 
Fiedler, Bodo  
Keywords: Impact behaviour;Damage Tolerance;Delamination;Thermomechanical Fracture
Issue Date: 11-Nov-2020
Publisher: Elsevier
Source: Composites Part C: Open Access 3: 100074 (2020)
Journal: Composites Part C: Open Access 
Abstract (english): 
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.
DOI: 10.15480/882.3341
ISSN: 2666-6820
Institute: Kunststoffe und Verbundwerkstoffe M-11 
Document Type: Article
Project: Schadenstolerante dünnschichtige (Thin-Ply) Kohlenstofffaser-Kunststoff-Verbunde mit Graphen-verstärktem Matrixsystem 
Funded by: 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.
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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