COMPUTATIONAL EVALUATION OF CRITICAL WEAR LIMITS IN FORKLIFT FORK ARMS USING THE FINITE ELEMENT METHOD: TOYOTA 5FD70 CASE STUDY
Published:
2026-06-16Downloads
Abstract
Forklift fork arms are critical load-bearing components that experience progressive thickness reduction due to operational abrasion. Indonesian Ministry of Manpower Regulation No. 08/2020 and ISO 5057:2022 require fork withdrawal when blade thickness is reduced to 90% of its original value. However, conventional inspection does not explain the continuous evolution of structural safety margins. This study evaluates the safety margin degradation of Toyota 5FD70 forklift fork arms under three wear scenarios using linear static Finite Element Method (FEM). The model geometry was developed from dimensional data in a certified inspection report. The material was modeled as AISI 4140 quenched and tempered steel with a conservative yield strength of 850 MPa. Numerical validity was checked through a mesh convergence study, reaching a final deviation of 1.98%. The results show that all static scenarios remain in the elastic regime, with Safety Factors of 1.745 at 0% wear, 1.759 at 5% wear, and 1.607 at 10% wear. A dynamic projection at 10% wear with a Dynamic Amplification Factor of 1.30 reduced the Safety Factor to 1.235, which falls into the marginal zone. These findings support the 10% wear limit as an early-warning threshold for risk-based forklift fork integrity management.
Keywords:
Finite Element Method; Forklift Fork Arms; Safety Factor; Von Mises Stress.References
ASM International. (1990). ASM handbook: Volume 1, Properties and selection: Irons, steels, and high-performance alloys (10th ed.). ASM International.
Bathe, K. J. (2014). Finite element procedures (2nd ed.). K. J. Bathe.
Borovinšek, M. (2025). PrePoMax v2.4.0 manual. University of Maribor.
Cascade Corporation. (2018). Fork safety guide. Cascade Corporation.
CEN. (2021). EN 13001-2:2021 Crane safety: General design, Part 2: Load actions. European Committee for Standardization.
Dhondt, G. (2024). CalculiX CrunchiX user’s manual version 2.22. CalculiX.
Dowling, N. E. (2013). Mechanical behavior of materials: Engineering methods for deformation, fracture, and fatigue (4th ed.). Pearson.
Figueiredo, M. V., Oliveira, F. M. F., Gonçalves, J. P. M., de Castro, P. M. S. T., & Fernandes, A. A. (2001). Fracture analysis of forks of a heavy duty lift truck. Engineering Failure Analysis, 8(5), 411–421. https://doi.org/10.1016/S1350-6307(00)00040-6
ISO. (2002). ISO 2330:2002 Fork-lift trucks: Fork arms: Technical characteristics and testing. International Organization for Standardization.
ISO. (2022). ISO 5057:2022 Industrial trucks: Inspection and repair of fork arms in service on fork-lift trucks. International Organization for Standardization.
Massone, J. M., & Boeri, R. E. (2010). Failure of forklift forks. Engineering Failure Analysis, 17(5), 1062–1068. https://doi.org/10.1016/j.engfailanal.2009.12.005
Pantazopoulos, G., Vazdirvanidis, A., Rikos, A., & Toulfatzis, A. (2014). Analysis of abnormal fatigue failure of forklift forks. Case Studies in Engineering Failure Analysis, 2(1), 9–14. https://doi.org/10.1016/j.csefa.2013.12.005
Pilkey, W. D., & Pilkey, D. F. (2008). Peterson’s stress concentration factors (3rd ed.). John Wiley & Sons.
Young, W. C., Budynas, R. G., & Sadegh, A. M. (2011). Roark’s formulas for stress and strain (8th ed.). McGraw-Hill.
Zienkiewicz, O. C., Taylor, R. L., & Zhu, J. Z. (2013). The finite element method: Its basis and fundamentals (7th ed.). Butterworth-Heinemann.
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Copyright (c) 2026 Aminuddin, Rasyid Ridho Harahap, Oloan Oloan; Arif Rahman Hakim
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