Cyclic Fatigue of Silicon Nitrides

Nikkilä, A.-P.; Mäntylä, T.

doi:10.1002/9780470310557.ch11

Cited by 7 publications

(2 citation statements)

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“…Different types of fatigue tests, such as four-point bending tests, [1][2][3][4][5] cantilever bending tests, 6,7 rotating bending tests, 8 and compression-tension tests, 9 have been conducted on silicon nitride. The effects of compression stress on the fatigue life in four-point bending tests was studied by Nikkila and Mantyla.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of compression stress on the fatigue life in four-point bending tests was studied by Nikkila and Mantyla. 3 They evaluated the fatigue lives of sintered and hot-pressed silicon nitrides under three different types of loading cycles: (a) sinusoidal, R ‫ס‬ −1 (tension-compression); (b) sinusoidal, R ‫ס‬ 0 (tension); and (c) positive cut sinusoidal, R ‫ס‬ 0 (tension). In type (c) tests no load was applied during the compression portion of the sinusoidal cycle, whereas a complete cycle in (b) consisted of the positive half of the sinusoidal cycle only.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Grain‐Boundary Phase on Dynamic Compression Fatigue in Hot‐Pressed Silicon Nitride

Sharma

Nemat‐Nasser

Vecchio

1998

Journal of the American Ceramic Society

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Two types of hot-pressed silicon nitride, one having an amorphous grain-boundary phase (6 wt% yttria, 3 wt% alumina) and the other having a predominantly crystalline grain-boundary phase (8 wt% yttria, 1 wt% alumina), were tested on a split Hopkinson pressure bar with a momentum trap, such that, in each test, the sample was subjected to a single predefined stress pulse and then recovered without being subjected to any other loads. The specimens were loaded repeatedly with a triangular pulse of 3.2 GPa amplitude at a strain rate of approximately 400/s. The dynamic fatigue life of amorphous grain-boundary-phase silicon nitride was observed to be higher than that of the corresponding fatigue life of crystalline grain-boundaryphase silicon nitride. The difference in fatigue lives is correlated to the microstructural damage occurring in both materials.

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