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Fatigue Life Evaluation of a Medium Dump Truck Frame under the Random Road Profile Excitation

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Abstract:

This study aims to evaluate the fatigue life of the frame assembly, including the chassis frame and subframe, of a medium dump truck. The combined method of finite element (FE) analysis and multi-body dynamic (MBD) simulation is employed to analyze the structural stress. Road roughness, as the vibration excitation source in the vehicle MBD model, is simulated according to random road profiles of ISO 8608:2016, considering the vehicle speed. The stress-time histories are calculated using quasi-static analysis when the frame structure is subjected to dynamic loads. The fatigue analysis model in the crack initiation period is developed based on the P(%)-S-N curve and linear damage rule. The results indicate that the frame assembly meets the required fatigue strength, achieving an estimated service life greater than 20 years under combined operating mode. These outcomes provide valuable insights for the design and durability assessment of the frame structure when vehicles are utilized under different operating conditions.

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Periodical:

Key Engineering Materials (Volume 1035)

Pages:

45-58

DOI:

https://doi.org/10.4028/p-Ds8dot

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Online since:

December 2025

Authors:

Tuan Dat Vu*, Van Tan Vu

Keywords:

Crack Initiation Period, Fatigue Life, Frame Structure, Medium Dump Truck, Percentage Probability of Survival, Random Road Profile

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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