Influences of wave form and compressive loads on the crack propagation behavior of sintered Si3N4 under cyclic loads.

Kishimoto, Hiroyuki; Ueno, Akira; Kawamoto, Hiroshi; Fujii, Yasuyoshi

doi:10.2472/jsms.38.1212

Cited by 27 publications

(1 citation statement)

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“…Standard bending specimens [26] were cut out of large forming rollers and the bending strength was determined [26,27]. Independent on the producer the characteristic strength of the silicon nitride roller materials was about 0 V 950 MPa and the Weibull modulus was about m 15.…”

Section: Strength Testsmentioning

confidence: 99%

Silicon nitride materials for hot working of high strength metal wires

Dänzer

Lengauer

2010

Engineering Failure Analysis

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Abstract. For hot rolling wires, tools are nowadays made of cemented carbides. In service, these rollers suffer from wear and thermal fatigue. Due to the properties of ceramics, their use could cause improvements in tool behaviour. In field tests -when rolling materials with high deformation resistance -cracks developed in the silicon nitride rollers, which grew for a long time period before large parts of the rollers broke apart. In more moderate rolling conditions the rollers operated safely.A FE model is used to analyse the in-service behaviour of cracks in the silicon nitride rollers. For the observed crack path the stress intensity factor of the cracks is determined using the weight function method. It increases up to a crack depth of around 0.35 mm and then decreases again with increasing crack depth. This explains the observed pop-in-type growth of cracks after an overload. Depending on the rolled materials, the popped in cracks have a length of up to 1.2 mm. The further growth of the cracks to a length of several millimetres, which is caused by a fatigue growth mechanism, needs several thousand additional revolutions.

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Section: Strength Testsmentioning

confidence: 99%