Details
| Original language | English |
|---|---|
| Pages (from-to) | 4645-4662 |
| Number of pages | 18 |
| Journal | Journal of composite materials |
| Volume | 56 |
| Issue number | 30 |
| Early online date | 31 Oct 2022 |
| Publication status | Published - Dec 2022 |
Abstract
Strength of fiber reinforced polymers (FRPs) under compression loads is typically limited by a shear localization failure mode called microbuckling which is highly sensitive to fiber misalignment. In addition to the magnitude of fiber misalignment, the dimensionality of fiber misalignment also plays a prominent role in the prediction of compression strength. Therefore, a comparison between 1D, 2D, and 3D fiber misalignment is carried out in a finite element setting with a homogenized representation of fiber and matrix materials. In real FRP structures, fiber misalignment is spread in a correlated random manner throughout the material volume resulting in a distribution of compression strength. Spectral representation method is used for developing the volumetric representation of fiber misalignment in numerical models, thus preserving the spatial correlations of fiber misalignment. As an input to the spectral representation method, two different functional forms of spectral density of the fiber misalignment are considered. The results of model series based on functional forms of spectral density are also compared against a reference model series based on experimental measurements of the fiber misalignment. Finally, a simple relation is proposed for prediction of compression strength at different percentiles of distribution of failure strengths with regard to scaling of mean square spectral density.
Keywords
- fiber misalignment, Fiber reinforced polymers, microbuckling, probabilistic methods, strength
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Materials Chemistry
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In: Journal of composite materials, Vol. 56, No. 30, 12.2022, p. 4645-4662.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The effect of model dimensionality on compression strength of fiber reinforced composites
AU - Safdar, Nabeel
AU - Daum, Benedikt
AU - Rolfes, Raimund
N1 - Funding Information: Funding by the Deutsche Forschungsgemeinschaft (DFG - German Research Foundation) under the project International Research and Training Group (IRTG1627) is gratefully acknowledged.
PY - 2022/12
Y1 - 2022/12
N2 - Strength of fiber reinforced polymers (FRPs) under compression loads is typically limited by a shear localization failure mode called microbuckling which is highly sensitive to fiber misalignment. In addition to the magnitude of fiber misalignment, the dimensionality of fiber misalignment also plays a prominent role in the prediction of compression strength. Therefore, a comparison between 1D, 2D, and 3D fiber misalignment is carried out in a finite element setting with a homogenized representation of fiber and matrix materials. In real FRP structures, fiber misalignment is spread in a correlated random manner throughout the material volume resulting in a distribution of compression strength. Spectral representation method is used for developing the volumetric representation of fiber misalignment in numerical models, thus preserving the spatial correlations of fiber misalignment. As an input to the spectral representation method, two different functional forms of spectral density of the fiber misalignment are considered. The results of model series based on functional forms of spectral density are also compared against a reference model series based on experimental measurements of the fiber misalignment. Finally, a simple relation is proposed for prediction of compression strength at different percentiles of distribution of failure strengths with regard to scaling of mean square spectral density.
AB - Strength of fiber reinforced polymers (FRPs) under compression loads is typically limited by a shear localization failure mode called microbuckling which is highly sensitive to fiber misalignment. In addition to the magnitude of fiber misalignment, the dimensionality of fiber misalignment also plays a prominent role in the prediction of compression strength. Therefore, a comparison between 1D, 2D, and 3D fiber misalignment is carried out in a finite element setting with a homogenized representation of fiber and matrix materials. In real FRP structures, fiber misalignment is spread in a correlated random manner throughout the material volume resulting in a distribution of compression strength. Spectral representation method is used for developing the volumetric representation of fiber misalignment in numerical models, thus preserving the spatial correlations of fiber misalignment. As an input to the spectral representation method, two different functional forms of spectral density of the fiber misalignment are considered. The results of model series based on functional forms of spectral density are also compared against a reference model series based on experimental measurements of the fiber misalignment. Finally, a simple relation is proposed for prediction of compression strength at different percentiles of distribution of failure strengths with regard to scaling of mean square spectral density.
KW - fiber misalignment
KW - Fiber reinforced polymers
KW - microbuckling
KW - probabilistic methods
KW - strength
UR - http://www.scopus.com/inward/record.url?scp=85141393673&partnerID=8YFLogxK
U2 - 10.1177/00219983221136272
DO - 10.1177/00219983221136272
M3 - Article
AN - SCOPUS:85141393673
VL - 56
SP - 4645
EP - 4662
JO - Journal of composite materials
JF - Journal of composite materials
SN - 0021-9983
IS - 30
ER -