Influence of specimen geometry and notch on fatigue lifetime and fracture behavior of aluminum-based nanocomposite under stress-controlled fully-reversed bending loads

Farhad Mohammadi; Mohammad Azadi; Mohammad Saedgh Aghareb Parast

doi:10.2174/1872210516666220817115300

Influence of specimen geometry and notch on fatigue lifetime and fracture behavior of aluminum-based nanocomposite under stress-controlled fully-reversed bending loads

Recent Pat Nanotechnol. 2022 Aug 17. doi: 10.2174/1872210516666220817115300. Online ahead of print.

Authors

Farhad Mohammadi¹, Mohammad Azadi¹, Mohammad Saedgh Aghareb Parast¹

Affiliation

¹ Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.

PMID: 35980048
DOI: 10.2174/1872210516666220817115300

Abstract

Introduction: In the present article, the effect of the specimen geometry and the sample notch was studied on the high cycle fatigue lifetime and fracture behavior of the aluminum-based nanocomposite.

Methods: For such an objective, rotary fully-reversed bending fatigue tests were performed on smooth and notched specimens, with the frequency of 100 Hz. Then, simulated results using the MSC Fatigue software were calculated and compared to the fatigue lifetime in the experiments for validation. Moreover, scanning electron microscopy was utilized to observe the fracture surface of failed samples after testing.

Results: Obtained results indicated that the fatigue lifetime increased by enhancing the sample diameter. However, the fatigue lifetime reduced when the stress concentration factor changed from 1.0 to 2.9.

Conclusions: All samples with three geometries had a brittle fracture due to cleavage and quasi-cleavage marks on the fracture surface.

Keywords: Aluminum alloy; High cycle fatigue; Nano-composite; Notch; Specimen geometry.