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The needs of power spectral density in fatigue life prediction of heavy vehicle leaf spring

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Abstract

This study characterized the properties of random strain loading data for using power spectral density (PSD) in frequency domain of a heavy vehicle leaf spring. This is due to missing data caused by the sensitivity of the strain gauges in capturing strain signal. Strain signal was captured from a leaf spring component for 100 s at a sampling rate of 200 Hz using strain gauge. Fatigue life prediction was computed using strain-life models: Coffin-Manson, Morrow and Smith-Watson-Topper (SWT). The fatigue strain data showed that downhill data produces the lowest fatigue life prediction at 3.42 × 102 cycles/block with high energy of 3.6 × 104μɛ2.Hz-1; then it was followed by curve and highway data. This was supported by the root-mean-square (RMS) value at 324.24 μɛ as it is directly related towards the PSD based on the energy contained for each captured signal. The correlation of fatigue life and strain amplitude was calculated to identify the distribution of fatigue strain data of leaf spring. Thus, the fatigue strain loading data can be characterized properly based on the energy content in PSD, the statistical parameter in the form of RMS value and the correlation with strain amplitude for random strain loading of leaf spring.

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Abbreviations

A :

Amplitude

b :

Fatigue strength exponent

c :

Fatigue ductility exponent

D i :

Damage of one cycle

E :

Modulus of elasticity

ε a :

Strain amplitude

ε’ f :

Fatigue ductility coefficient

σ f :

Fatigue strength coefficient

σ m :

Mean stress

σ max :

Maximum stress

n :

Data points

N f :

Number of cycles

N fi :

Number of constant amplitude cycles

N i :

Number of applied cycles

ω :

Frequency

x :

Sampled order

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Acknowledgments

The authors would like to express their gratitude to Universiti Kebangsaan Malaysia (Research fundings: DCP-2017-020/1 & GUP-2018-077) for supporting this research.

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Correspondence to Salvinder Singh Karam Singh.

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Recommended by Editor Chongdu Cho

Lennie Abdullah is a Ph.D. candidate in Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Selangor, Malaysia. Her research interests include fatigue life assessment, reliability assessment and probabilistic approach.

Salvinder Singh Karam Singh is a Senior Lecturer in Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Selangor, Malaysia. He received his Ph.D. from Universiti Kebangsaan Malaysia. His research interests include fatigue life assessment, fracture mechanics reliability assessment and probabilistic approach.

Shahrum Abdullah is a Professor of Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Selangor, Malaysia. He received his Ph.D. from Sheffield University. His research interests include fatigue life assessment, fracture mechanics, mechanics of materials signal analysis and engineering design.

Abdul Hadi Azman is a Lecturer in Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Selan-gor, Malaysia. He received his Ph.D. from University of Grenoble Alpes, France. His research interests include computer-aided design (CAD), 3D printing product and development and mechanical engineering.

Ahmad Kamal Ariffin is a Professor of Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Selangor, Malaysia. He received his Ph.D. from University of Wales Swansea, United Kingdom. His research interests include computational Mechanics, computational fracture and fatigue, computational corrosion and finite/boundary/discrete element methods/parallel computation.

Yat Sheng Kong has a Ph.D. in Mechanical and Manufacturing Engineering, Universiti Kebangsaan Malaysia, Selan-gor, Malaysia. His research interests include finite element analysis, stress analysis and design optimization.

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Abdullah, L., Singh, S.S.K., Abdullah, S. et al. The needs of power spectral density in fatigue life prediction of heavy vehicle leaf spring. J Mech Sci Technol 34, 2341–2346 (2020). https://doi.org/10.1007/s12206-020-0510-z

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  • DOI: https://doi.org/10.1007/s12206-020-0510-z

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