Correlation of Uniaxial and Multiaxial Fatigue Models for Automobile Spring Life Assessment

  • Y.S. Kong
  • S. AbdullahEmail author
  • D. Schramm
  • M.Z. Omar
  • S.M. Haris
Research paper


This paper presents a regression analysis of uniaxial and multiaxial fatigue life for automobile coil spring under various road excitations. Coil spring is a suspension component with complex geometry and shear loading which is applied during operating conditions. Hence, uniaxial strain measurement for durability assessment of coil spring is insufficient because the loadings are non-proportional. Rosette strain signals of coil spring under five different road conditions were obtained and used as input to uniaxial strain-life and multiaxial critical plane models to predict the spring fatigue life. During the multiaxial fatigue analysis, the strain biaxiality ratio of range 0.3 to 0.5 indicates the loadings as out-of-phase. Through a simple linear regression method, a linear regression model between uniaxial and multiaxial fatigue life were obtained with coefficient of determination value as high as 0.8696. This model provides significant contribution through correlating uniaxial to multiaxial fatigue life. Hence, uniaxial fatigue life predictions could be approximated to multiaxial for more conservative analysis through the application of generated linear models.


Multiaxial fatigue Coil spring Critical plane Uniaxial fatigue Linear regression 



The authors wish to acknowledge KPT Malaysia (Mybrain15) and DAAD for the research funding.


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Copyright information

© The Society for Experimental Mechanics, Inc 2019

Authors and Affiliations

  1. 1.Centre for Integrated Design for Advanced Mechanical Systems (PRISMA), Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangiMalaysia
  2. 2.Departmental Chair of MechatronicsUniversity of Duisburg-EssenDuisburgGermany
  3. 3.Centre for Materials Engineering and Smart Manufacturing (MERCU), Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaBangiMalaysia

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