Failure analysis of a motor vehicle suspension helical spring

dc.citation.epage82
dc.citation.issueVolume 6, № 1
dc.citation.journalTitleUkrainian Journal of Mechanical Engineering and Materials Science
dc.citation.spage72
dc.contributor.affiliationLviv Polytechnic National University
dc.contributor.authorBohun, Lidia
dc.contributor.authorPleshakov, Eduard
dc.contributor.authorShvachko , Sergiy
dc.date.accessioned2022-11-23T09:37:59Z
dc.date.available2022-11-23T09:37:59Z
dc.date.issued2020
dc.date.submitted2022
dc.description.abstractThe purpose of this work is to reveal the cause of the failure of the motor vehicle rear suspension barrel-shaped spring with the progressive elasticity characteristic and predict measures to increase the lifetime of springs of this type. The fracture of the spring occurred on the middle coil, which operates under conditions of more severe stress in comparison with other coils. The chemical composition of the spring material, determined by X-ray fluorescence spectral and microstructural analyzes, corresponded to chromium-silicon steel 54SiCr6. In terms of structure and mechanical properties, the spring material met the standards. No traces of decarburization were detected, and no crack initiation, caused by non-metallic inclusions, was found in the material of the fractured spring. Macroscopic examination of the spring surface did not reveal any cracks, scratches, dents, traces of blows with stones and marks of spring coiling tool. Instead, extensive areas of exfoliation of the protective coating were found. The metallographic analysis revealed selective corrosion in the form of pitting damage in places of exfoliation of the protective coating. The fatigue crack propagates from the certain deep pit with the reorientation of the crack plane along the spiral surface to the central axis of the coil wire. After depletion of the safety margin, the spring broke down quickly. The fast fracture zone contains steps of the river pattern formed due to the spiral reorientation of the fracture surface. The research can be used to understand the importance of adhesive strength and wear resistance of protective coatings on the spring surface. Their local exfoliation causes subsequent corrosion damage to the spring, which stimulates its fatigue fracture.
dc.format.pages72-82
dc.identifier.citationBohun L. Failure analysis of a motor vehicle suspension helical spring / Lidia Bohun, Eduard Pleshakov, Sergiy Shvachko // Ukrainian Journal of Mechanical Engineering and Materials Science. – Lviv : Lviv Politechnic Publishing House, 2020. – Volume 6, № 1. – P. 72–82. – Bibliography: 28 titles.
dc.identifier.doihttps://doi.org/10.23939/ujmems2020.01.072
dc.identifier.urihttps://ena.lpnu.ua/handle/ntb/57199
dc.language.isoen
dc.publisherLviv Politechnic Publishing House
dc.relation.ispartofUkrainian Journal of Mechanical Engineering and Materials Science
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dc.subjectbarrel-shaped spring, spring steel, fracture, microstructure analysis, failure analysis, corrosion fatigue
dc.titleFailure analysis of a motor vehicle suspension helical spring
dc.typeArticle

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