Simulating the variability and scale effect for slow crack growth in Hi-Nicalon SiC-based tows: A parametric study

Mazerat, S.; Pailler, R.

doi:10.1016/j.jeurceramsoc.2021.07.032

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…However, such a conclusion disregards the load dispersion within a tow and the fact that its critical fiber is most of the times overloaded (this being related to the low value of α t [Table 1]) as shown in Ref. [16]. Implicitly, this means that some of the other fibers, less critical, are underloaded or even unloaded ( γ fraction).…”

Section: Resultsmentioning

confidence: 99%

“…Although several models were proposed to relate the failure time to the applied stress, 13,14 the Paris–Erdogan power law is here employed. This model, admitted to be strictly empirical, was selected to maintain continuity with previous works 5,8,11,15,16 . The temperature dependence of the stress exponent ( n ) 14 was hence not considered in this work.…”

Section: Methodsmentioning

confidence: 99%

“…The lifetime of each filament was calculated and sorted to define the tow failure ( α t fraction) for a given applied stress 8,10 . In this work, no load sharing was considered 16 . This simulation was used to depict the variability of tow lifetime, repeating it 1000 times.…”

Section: Methodsmentioning

confidence: 99%

“…This model, admitted to be strictly empirical, was selected to maintain continuity with previous works. 5,8,11,15,16 The temperature dependence of the stress exponent (n) 14 was hence not considered in this work.…”

Section: Methodsmentioning

confidence: 99%

“…8,10 In this work, no load sharing was considered. 16 This simulation was used to depict the variability of tow lifetime, repeating it 1000 times. The same was also performed for filaments, based on 10 000 random values of tensile strength.…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Failure by slow crack growth of SiC fibers: Comparing the lifetime scatter for single filaments and multifilament tows

Mazerat¹,

Pailler²

2022

J Am Ceram Soc.

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SiC‐based fibers are subjected to slow crack growth, a crack growth mechanism activated by stresses and the chemical environment, as identified by static fatigue testing. Such tests can be performed on filaments or bundles. Although both types of specimens show a similar lifetime variation, testing of bundles is often preferred. This work compares the scatter of lifetimes predicted for filaments and for tows using a dedicated Monte Carlo simulation tool relying on the following hypotheses: The stress applied to a single filament can be defined, whereas the size of its most critical flaw cannot; on a bundle, neither the applied stress nor the strength of the critical filament (which triggers the cascade failure and the tow failure) can be defined. Depending on the parallelism of fibers inside the bundle and their strength dispersion, the lifetime scatter can be narrower for filaments compared to tows or vice versa.

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Section: Resultsmentioning

confidence: 99%