Failure analysis of copper tube

A new interesting paper in « Engineering Failure Analysis » published on ScienceDirect.com. This paper reports the failure analysis of a leaked copper tube used in a refrigerating plant for carrying polyol ester oil for lubrication and cooling of compressor bearings. Failure had occurred at the bent region of the tube in the form of a wide diametric crack.

More information : Failure analysis of copper tube used in a refrigerating plant.

Failure of T-Tap Assembly

www.dtbtest.com/PDFs/t-tap-assembly-failure.pdf

Description : Failure of T-Tap Assembly installed on a 69 KV – 437 Amp aboveground line
Problem : Determine whether the failure was an isolated incident or a systemic problem
Analysis : The failure occurred through a cascade that originated from inadequate clamping
Resolution & Recommendations :
The failure was an isolated instance with potential to be systemwide if the clamping force was not correctly applied and monitored.

Fiche analyse défaillance DAYTON T. BROWN METALLURGICAL LABORATORY

Failure of wireless Point-of-Sale devices

www.dtbtest.com/PDFs/wireless-point-of-sale-devices-failure.pdf

Description : Failure of wireless Point-of-Sale devices
Problem : New Point-of-sale devices failed after storage or at various times during service
Analysis : Failure was caused by the copper ion bridging of two conductors on a terminal. Copper from terminals leached out and was transported due to corrosive attack of tin-lead plating by contaminants released from uncured epoxy of a chip-on-board assembly in close proximity.
Resolution & Recommendations :
Extend epoxy curing to remove corrosive ion source.

Fiche analyse défaillance DAYTON T. BROWN METALLURGICAL LABORATORY