Details
| Original language | English |
|---|---|
| Article number | 100146 |
| Journal | Composites Part C: Open Access |
| Volume | 5 |
| Early online date | 24 Apr 2021 |
| Publication status | Published - Jul 2021 |
Abstract
Different bio-inspired Bouligand thin-ply Carbon-Fibre-Reinforced Plastic (CFRP) laminates with a pitch angle as low as 2.07 ∘ are realised, which is the smallest pitch angle realised in literature. The angle is therefore close angles found in biological microstructures. Low-Velocity Impact (LVI) and residual compressive strength tests determined the damage tolerance of the structures. Investigated were two different interlaminar fracture toughnesses and two different metal-Bouligand-CFRP-layups. The low pitch angle results in significantly higher residual strengths than 45 ∘ quasi-isotropic (QI) layups, despite the significantly lower proportion of 0 ∘ fibres. Higher fracture toughness and hybridisation with steel layers lead to reduced matrix damage without increasing residual compressive strength. In-plane plane tension properties are determined with a pitch angle of 2.59 ∘. The results reveal, that the unnotched tensile strength is significantly lower. However, only helicoidal, sub-critical matrix cracking and no delaminations occur before final failure. The sub-critical matrix cracking leads to almost no notch sensitivity and a similar open-hole-tensile strength to 45 ∘-QI layups despite the low number of 0 ∘-fibres.
Keywords
- CT analysis, Failure, Hybrid, Layered structures, Microstructures, Stress concentrations
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- Mechanical Engineering
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In: Composites Part C: Open Access, Vol. 5, 100146, 07.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Damage Tolerance and Notch Sensitivity of Bio-Inspired Thin-Ply Bouligand Structures
AU - Körbelin, Johann
AU - Goralski, Philip
AU - Kötter, Benedikt
AU - Bittner, Florian
AU - Endres, Hans-Josef
AU - Fiedler, Bodo
N1 - 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
PY - 2021/7
Y1 - 2021/7
N2 - Different bio-inspired Bouligand thin-ply Carbon-Fibre-Reinforced Plastic (CFRP) laminates with a pitch angle as low as 2.07 ∘ are realised, which is the smallest pitch angle realised in literature. The angle is therefore close angles found in biological microstructures. Low-Velocity Impact (LVI) and residual compressive strength tests determined the damage tolerance of the structures. Investigated were two different interlaminar fracture toughnesses and two different metal-Bouligand-CFRP-layups. The low pitch angle results in significantly higher residual strengths than 45 ∘ quasi-isotropic (QI) layups, despite the significantly lower proportion of 0 ∘ fibres. Higher fracture toughness and hybridisation with steel layers lead to reduced matrix damage without increasing residual compressive strength. In-plane plane tension properties are determined with a pitch angle of 2.59 ∘. The results reveal, that the unnotched tensile strength is significantly lower. However, only helicoidal, sub-critical matrix cracking and no delaminations occur before final failure. The sub-critical matrix cracking leads to almost no notch sensitivity and a similar open-hole-tensile strength to 45 ∘-QI layups despite the low number of 0 ∘-fibres.
AB - Different bio-inspired Bouligand thin-ply Carbon-Fibre-Reinforced Plastic (CFRP) laminates with a pitch angle as low as 2.07 ∘ are realised, which is the smallest pitch angle realised in literature. The angle is therefore close angles found in biological microstructures. Low-Velocity Impact (LVI) and residual compressive strength tests determined the damage tolerance of the structures. Investigated were two different interlaminar fracture toughnesses and two different metal-Bouligand-CFRP-layups. The low pitch angle results in significantly higher residual strengths than 45 ∘ quasi-isotropic (QI) layups, despite the significantly lower proportion of 0 ∘ fibres. Higher fracture toughness and hybridisation with steel layers lead to reduced matrix damage without increasing residual compressive strength. In-plane plane tension properties are determined with a pitch angle of 2.59 ∘. The results reveal, that the unnotched tensile strength is significantly lower. However, only helicoidal, sub-critical matrix cracking and no delaminations occur before final failure. The sub-critical matrix cracking leads to almost no notch sensitivity and a similar open-hole-tensile strength to 45 ∘-QI layups despite the low number of 0 ∘-fibres.
KW - CT analysis
KW - Failure
KW - Hybrid
KW - Layered structures
KW - Microstructures
KW - Stress concentrations
UR - http://www.scopus.com/inward/record.url?scp=85119197095&partnerID=8YFLogxK
U2 - 10.1016/j.jcomc.2021.100146
DO - 10.1016/j.jcomc.2021.100146
M3 - Article
VL - 5
JO - Composites Part C: Open Access
JF - Composites Part C: Open Access
SN - 2666-6820
M1 - 100146
ER -