Journal of Failure Analysis and Prevention

, Volume 18, Issue 6, pp 1516–1525 | Cite as

Prediction of Residual Fatigue Life of Composite Mono Leaf Spring Based on Stiffness Degradation

  • N. I. JamadarEmail author
  • S. B. Kivade
  • Prathmesh Tati
Technical Article---Peer-Reviewed


Estimation of remaining useful life gained considerable attention in composites technology in recent years. It is due to efficient technique to check the reliability or sustainability of components. This paper adopts the mixed-mode approaches such as experimental, analytical and finite element methods to predict the residual fatigue life of cracked composite mono leaf spring. The finite element analysis is carried out on both healthy and cracked composite springs to analyze static and fatigue life. Experimental fatigue test has been conducted on an artificially cracked leaf spring for 500 set numbers of fatigue cycles up to 2000 to record strains. These strains are used in Hwang and Han analytical model to determine the residual fatigue life of cracked spring. As a result, the residual fatigue life of cracked spring is found to be 2.48 × 106 cycles determined by the model. At the end, the stiffness degradation curve is drawn by Hwang and Han model and compared with benchmark stiffness degradation curve. The analytical model results are found to be in closer approximation with the benchmark.


Cracked composite mono leaf spring Residual fatigue life Hwang and Han analytical model Stiffness degradation 

List of symbols


Fatigue modulus degradation rate

A, C, B

Material constants

Tx, Ty and Tz

Translation along x, y and z directions

Rx, Ry and Rz

Rotations along x, y and z directions


Fatigue modulus at 0th cycle


No. of applied fatigue cycles


No. of Fatigue cycles to failure


Difference in subsequent residual fatigue cycles


Stiffness of cracked spring at subsequent fatigue cycles


Stiffness of cracked spring at zero fatigue cycles


Stiffness of spring


Maximum stress


Ultimate tensile strength



Strain gauge-1


Strain gauge-2



This research work was supported by Automotive Research Association of India, Chakan Plant, Pune, by providing the testing facility.


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Copyright information

© ASM International 2018

Authors and Affiliations

  1. 1.VTU, Research Resource CenterBelagavi RegionIndia
  2. 2.Basavakalyan Engineering CollegeBasavakalyanIndia
  3. 3.Dr. D. Y. Patil Institute of TechnologyPimpri, PuneIndia

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