English
Spark plug failure due to a combination of strong magnetic fields and undesirable fuel additives
Armando Ortiz - Universidad Nacional Autonoma de Mexico
(in lingua inglese)
The case presented here is economically important because early engine failure has a nefarious effect on brand reputation. It exemplifies the fact that failure and fracture are different terms and is a rare case where electromagnetic phenomena cause the failure of a mechanical system. The strong magnetic field in the high-efficiency spark plug deposits excessive amounts of metallic ions on the insulator where they cannot be burned off. This creates a shortcircuit, leading to inefficient combustion and deposition of soot on the insulator surface. If high-quality fuel is used, insufficient metal ions are present to initiate the process, but organometallic anti-knocking agents in low-grade fuel acerbate the effect and provoke failure.
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Fonte: Articolo Case Studies in Engineering Failure Analysis, 2013
Settori: Automotive, Motori
Mercati: Trasporti e Automotive
Parole chiave: Motori endotermici
