Fatigue analysis of aluminum components in powertrain mounts

dc.contributor.authorBergquist, Caroline
dc.contributor.authorVaez Mahdavi, Elina
dc.contributor.departmentChalmers tekniska högskola / Institutionen för mekanik och maritima vetenskapersv
dc.contributor.departmentChalmers University of Technology / Department of Mechanics and Maritime Sciencesen
dc.description.abstractComponents in the powertrain mounts systems withstand a large number of load cycles with varying amplitude during their operational life. Despite this, no fatigue analysis has previously been carried out of the studied components. The main aim of this study was therefore to create a method for analyzing fatigue in aluminum components in powertrain mounts. A bracket in the powertrain mounts system made of high pressure die cast aluminum EN– 46000 was in focus. The study partially aimed to account for and determine the effect of pretension on the bracket fatigue resistance. A widespread problem with fatigue analysis is the access to material fatigue parameters, and approximated material data are often employed. To investigate the consequences the influence of using various material fatigue parameters for EN– 46000 was investigated. Based on a literature study, a strain-based approach to fatigue was selected. This allows to account for plasticity. The construction of strain – life curve combined with the establishment of a Ramberg – Osgood equation for cyclic stress – strain relationship was the basis of the fatigue analysis. Due to the mean stress that arose from the pretension, a mean stress correction following Smith –Watson –Topper was utilized. To decrease computational time, a linear elastic stress FE-analysis was carried out, Neuber correction was employed to account for local plasticity in the fatigue analyses. Fatigue analyses of the bracket were performed with approximated material fatigue parameters using the Bäumel – Seeger method. The bracket was predicted to sustain an infinite number of load cycles. An investigation of how much larger the loads could be to sustain 4 standard operational lives was conducted. The result was 2.4 times the applied load. It was also found that small areas were affected by fatigue. Fatigue analyses were carried out with and without the pretension. A slight decrease in fatigue life was obtained without pretension due to compressive mean stresses. From a sensitivity analysis, it was concluded that employed material fatigue parameters have a significant impact on fatigue life, and that approximated material should not be used for the final fatigue analysis. Keywords:fatigue, aluminum alloys, nCode DesignLife, pretension, strain-based, stress-based, powertrain mounts, material fatigue parameters
dc.relation.ispartofseriesMaster's thesis - Department of Mechanics and Maritime Sciences : 2019:08
dc.subjectHållbar utveckling
dc.subjectInnovation och entreprenörskap (nyttiggörande)
dc.subjectMetallurgi och metalliska material
dc.subjectSustainable Development
dc.subjectInnovation & Entrepreneurship
dc.subjectSolid mechanics
dc.subjectVehicle Engineering
dc.subjectMetallurgy and Metallic Materials
dc.titleFatigue analysis of aluminum components in powertrain mounts
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster Thesisen
local.programmeApplied mechanics (MPAME), MSc
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