Investigation of parameters affecting crack growth in metal matrix nanocomposites

Document Type : Research Article

Authors

Faculty of Engineering, Department of Mechanical Engineering, University of Qom, Qom, Iran

10.22060/mej.2026.24829.7902

Abstract

In this study parameters affecting fatigue crack growth in metal matrix nanocomposites were investigated. The matrix materials studied in this study were aluminum, nickel, magnesium, titanium, and copper, and the fillers were single-walled carbon nanotubes. Modeling was performed using Abaqus software, and the effects of parameters such as the weight percentage of carbon nanotubes, initial crack length, initial crack angle, different matrix materials, and sheet thickness were investigated. The analyses showed that increasing the initial crack length led to an increase in the crack growth rate and a decrease in the number of failure cycles. Increasing the initial crack angle led to a decrease in the stress intensity factor and fatigue growth rate, which resulted in an increase in the number of failure cycles. Also, carbon nanotubes with a higher weight percentage showed greater resistance to crack growth. In addition, with increasing sheet thickness, the stress intensity factor and fatigue growth rate decreased, and the number of cycles until complete failure of the part increased. Finally, by examining the material of the nanocomposite matrix, it can be said that the fatigue strength of materials combined with single-walled carbon nanotubes, from least to greatest, is magnesium, aluminum, copper, nickel and titanium. This research showed that the appropriate combination of materials and control of crack geometric parameters can help increase the life of parts under fatigue loading.

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Amirkabir Journal of Mechanical Engineering
Volume 57, Issue 9
in progress
December 2025

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