Failure analysis of Co–Cr hip resurfacing prosthesis during solidification

A paper published on january 2013 in « Case Studies in Engineering Failure Analysis« .

In this study a failure originated during solidification process into the femoral stem component of Hip Resurfacing prosthesis was investigated.  The results exhibited hot tearing, shrinkage porosity and metal oxide films due to inadequate heat dissipation during solidification process, as a consequence of poor investment casting ceramic mold configuration. Also in this paper was improved the casting design solving this kind of defects.

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Bomb rack link failure

www.dtbtest.com/PDFs/bomb-rack-link.pdf

Description : Bomb rack link
Problem : PH 13-8 Mo (H950) Link failed during low temperature (-70 F) testing
Analysis : Damage accumulation due to bending of under-designed component
propagated a brittle failure
Resolution & Recommendations :
Increase link cross section by 50% to decrease the net-section
stresses or replacing 13-8 Mo with a Ni-base Superalloy for superior cryogenic properties.

Fiche analyse défaillance DAYTON T. BROWN METALLURGICAL LABORATORY