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Fracture of a dental prosthesis from an inner thermal crack

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A new paper about « Case study in Engineering Failure Analysis » published on ScienceDirect.com.

This paper describes the fractographic analysis of a veneer-ZrO2 single-unit dental prosthesis that fractured in a shell-like manner. Analysis of the retrieved fragment revealed that the crack originated in the bulk of the veneer from a thermal flaw located between two layers of the veneering material. Using the measured flaw plane it showed that the conditions of loading at fracture were complex and probably involved important tangential components.

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Failure analysis of a burner ring made of 20Cr32Ni1Nb alloy in gas turbine combustion chamber

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A new paper in « Case study in Engineering Failure Analysis » published on ScienceDirect.com.

The failure analysis of an insert ring of a burner in a 156 MW gas turbine, made of 20Cr32Ni1Nb alloy is presented. Normally, the useful service life of these parts under ideal conditions is about 30000 hours. However, more likely fracture and failure could be observed in5000-hour inspections, which resulted in the early and premature replacement of these parts. This paper brings out the detail of investigation carried out.

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