Next Article in Journal
On the Use of Mechano-Chemically Modified Ground Tire Rubber (GTR) as Recycled and Sustainable Filler in Styrene-Butadiene Rubber (SBR) Composites
Next Article in Special Issue
Consolidation and Tow Spreading of Digitally Manufactured Continuous Fiber Reinforced Composites from Thermoplastic Commingled Tow Using a Five-Axis Extrusion System
Previous Article in Journal
The Effect of Modifications of Activated Carbon Materials on the Capacitive Performance: Surface, Microstructure, and Wettability
Previous Article in Special Issue
Modeling and Simulations of the Sulfur Infiltration in Activated Carbon Fabrics during Composite Cathode Fabrication for Lithium-Sulfur Batteries
Article

Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach

1
LMT-Ecole Normale Supérieure Paris-Saclay, 75005 Cachan, France
2
MONTUPET, 60290 Laigneville, France
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Tornabene
J. Compos. Sci. 2021, 5(3), 67; https://doi.org/10.3390/jcs5030067
Received: 22 January 2021 / Revised: 17 February 2021 / Accepted: 23 February 2021 / Published: 28 February 2021
(This article belongs to the Special Issue Feature Papers in Journal of Composites Science in 2020)
The present paper investigates the static fatigue behavior of Hi-Nicalon fiber-reinforced SiC–SiC minicomposites at high temperatures in the 900–1200 °C range, and under tensile stresses above the proportional limit. The stress–rupture time relation was analyzed with respect to subcritical crack growth in filaments and fiber tow fracture. Slow crack growth from flaws located at the surface of filaments is driven by the oxidation of free carbon at the grain boundaries. Lifetime of the reinforcing tows depends on the statistical distribution of filament strength and on structural factors, which are enhanced by temperature increase. The rupture time data were plotted in terms of initial stresses on reinforcing filaments. The effect of temperature and load on the stress–rupture time relation for minicomposites was investigated using results of fractography and predictions of minicomposite lifetime using a model of subcritical growth for critical filaments. The critical filament is the one whose failure by slow crack-growth triggers unstable fracture of the minicomposite. This is identified by the strength–probability relation provided by the cumulative distribution function for filament strength at room temperature. The results were compared to the fatigue behavior of dry tows. The influence of various factors related to oxidation, including multiple failures, load sharing, and variability, was analyzed. View Full-Text
Keywords: fiber; tow; minicomposite; lifetime; static fatigue; slow crack growth; fracture probability fiber; tow; minicomposite; lifetime; static fatigue; slow crack growth; fracture probability
Show Figures

Figure 1

MDPI and ACS Style

Lamon, J.; Laforêt, A. Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach. J. Compos. Sci. 2021, 5, 67. https://doi.org/10.3390/jcs5030067

AMA Style

Lamon J, Laforêt A. Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach. Journal of Composites Science. 2021; 5(3):67. https://doi.org/10.3390/jcs5030067

Chicago/Turabian Style

Lamon, Jacques; Laforêt, Adrien. 2021. "Static Fatigue of SiC/SiC Minicomposites at High Temperatures Up to 1200 °C in Air: Multiscale Approach" J. Compos. Sci. 5, no. 3: 67. https://doi.org/10.3390/jcs5030067

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop