Experimental determination of a probabilistic failure envelope for carbon fiber reinforced polymers under combined compression–shear loads

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

Organisationseinheiten

Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer111585
FachzeitschriftInternational Journal of Solids and Structures
Jahrgang244-245
Frühes Online-Datum26 März 2022
PublikationsstatusVeröffentlicht - 1 Juni 2022

Abstract

The compressive strength of fiber reinforced composites is sensitive to material imperfections. Material imperfections are spread in the volume in an apparently random manner in the form of fiber misalignment, resulting in non-deterministic strength in compression dominated load cases. The main factors dictating failure under compression dominated loads are the fiber misalignment and the nonlinear material behavior. To enable reliable failure prediction, a quantification of the strength uncertainty is required. Therefore, the current investigation considers different experimental aspects of the problem such as measurements of the fiber misalignment and the material characterization. To implement combined compression–shear loading, a newly in-house developed combined loading fixture was used. A statistically significant number of specimens was tested under aforementioned load cases. Macroscopic images of the failed specimens and a micrograph of the fracture surface are shown to provide evidence of microbuckling failure mode under combined compression–shear loads. Using the experimental strain measurements, a probabilistic failure envelope in strain space is presented. Results of the axial compression load case are interpreted in the context of the notion of the effective misalignment angle using an analytical model. A failure envelope in stress space is derived using an analytical solution for the combined compression–shear load cases and the effective global misalignment angle calculated from the measurements. Applied far field stresses of different load cases are compared, and a visual depiction of the strain localization phenomenon leading to microbuckling failure using digital image correlation is presented.

ASJC Scopus Sachgebiete

Zitieren

Experimental determination of a probabilistic failure envelope for carbon fiber reinforced polymers under combined compression–shear loads. / Safdar, N.; Daum, B.; Scheffler, S. et al.
in: International Journal of Solids and Structures, Jahrgang 244-245, 111585, 01.06.2022.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Safdar N, Daum B, Scheffler S, Rolfes R. Experimental determination of a probabilistic failure envelope for carbon fiber reinforced polymers under combined compression–shear loads. International Journal of Solids and Structures. 2022 Jun 1;244-245:111585. Epub 2022 Mär 26. doi: 10.1016/j.ijsolstr.2022.111585
Safdar, N. ; Daum, B. ; Scheffler, S. et al. / Experimental determination of a probabilistic failure envelope for carbon fiber reinforced polymers under combined compression–shear loads. in: International Journal of Solids and Structures. 2022 ; Jahrgang 244-245.
Download
@article{5b193d7c0fa54ac59d3c94cb70a64232,
title = "Experimental determination of a probabilistic failure envelope for carbon fiber reinforced polymers under combined compression–shear loads",
abstract = "The compressive strength of fiber reinforced composites is sensitive to material imperfections. Material imperfections are spread in the volume in an apparently random manner in the form of fiber misalignment, resulting in non-deterministic strength in compression dominated load cases. The main factors dictating failure under compression dominated loads are the fiber misalignment and the nonlinear material behavior. To enable reliable failure prediction, a quantification of the strength uncertainty is required. Therefore, the current investigation considers different experimental aspects of the problem such as measurements of the fiber misalignment and the material characterization. To implement combined compression–shear loading, a newly in-house developed combined loading fixture was used. A statistically significant number of specimens was tested under aforementioned load cases. Macroscopic images of the failed specimens and a micrograph of the fracture surface are shown to provide evidence of microbuckling failure mode under combined compression–shear loads. Using the experimental strain measurements, a probabilistic failure envelope in strain space is presented. Results of the axial compression load case are interpreted in the context of the notion of the effective misalignment angle using an analytical model. A failure envelope in stress space is derived using an analytical solution for the combined compression–shear load cases and the effective global misalignment angle calculated from the measurements. Applied far field stresses of different load cases are compared, and a visual depiction of the strain localization phenomenon leading to microbuckling failure using digital image correlation is presented.",
keywords = "A. Fiber reinforced, B. Microbuckling, C. Compression and shear, D. Statistical properties/CT analysis",
author = "N. Safdar and B. Daum and S. Scheffler and R. Rolfes",
year = "2022",
month = jun,
day = "1",
doi = "10.1016/j.ijsolstr.2022.111585",
language = "English",
volume = "244-245",

}

Download

TY - JOUR

T1 - Experimental determination of a probabilistic failure envelope for carbon fiber reinforced polymers under combined compression–shear loads

AU - Safdar, N.

AU - Daum, B.

AU - Scheffler, S.

AU - Rolfes, R.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - The compressive strength of fiber reinforced composites is sensitive to material imperfections. Material imperfections are spread in the volume in an apparently random manner in the form of fiber misalignment, resulting in non-deterministic strength in compression dominated load cases. The main factors dictating failure under compression dominated loads are the fiber misalignment and the nonlinear material behavior. To enable reliable failure prediction, a quantification of the strength uncertainty is required. Therefore, the current investigation considers different experimental aspects of the problem such as measurements of the fiber misalignment and the material characterization. To implement combined compression–shear loading, a newly in-house developed combined loading fixture was used. A statistically significant number of specimens was tested under aforementioned load cases. Macroscopic images of the failed specimens and a micrograph of the fracture surface are shown to provide evidence of microbuckling failure mode under combined compression–shear loads. Using the experimental strain measurements, a probabilistic failure envelope in strain space is presented. Results of the axial compression load case are interpreted in the context of the notion of the effective misalignment angle using an analytical model. A failure envelope in stress space is derived using an analytical solution for the combined compression–shear load cases and the effective global misalignment angle calculated from the measurements. Applied far field stresses of different load cases are compared, and a visual depiction of the strain localization phenomenon leading to microbuckling failure using digital image correlation is presented.

AB - The compressive strength of fiber reinforced composites is sensitive to material imperfections. Material imperfections are spread in the volume in an apparently random manner in the form of fiber misalignment, resulting in non-deterministic strength in compression dominated load cases. The main factors dictating failure under compression dominated loads are the fiber misalignment and the nonlinear material behavior. To enable reliable failure prediction, a quantification of the strength uncertainty is required. Therefore, the current investigation considers different experimental aspects of the problem such as measurements of the fiber misalignment and the material characterization. To implement combined compression–shear loading, a newly in-house developed combined loading fixture was used. A statistically significant number of specimens was tested under aforementioned load cases. Macroscopic images of the failed specimens and a micrograph of the fracture surface are shown to provide evidence of microbuckling failure mode under combined compression–shear loads. Using the experimental strain measurements, a probabilistic failure envelope in strain space is presented. Results of the axial compression load case are interpreted in the context of the notion of the effective misalignment angle using an analytical model. A failure envelope in stress space is derived using an analytical solution for the combined compression–shear load cases and the effective global misalignment angle calculated from the measurements. Applied far field stresses of different load cases are compared, and a visual depiction of the strain localization phenomenon leading to microbuckling failure using digital image correlation is presented.

KW - A. Fiber reinforced

KW - B. Microbuckling

KW - C. Compression and shear

KW - D. Statistical properties/CT analysis

UR - http://www.scopus.com/inward/record.url?scp=85127357970&partnerID=8YFLogxK

U2 - 10.1016/j.ijsolstr.2022.111585

DO - 10.1016/j.ijsolstr.2022.111585

M3 - Article

AN - SCOPUS:85127357970

VL - 244-245

JO - International Journal of Solids and Structures

JF - International Journal of Solids and Structures

SN - 0020-7683

M1 - 111585

ER -

Von denselben Autoren