Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (10): 1244-1252.DOI: 10.1007/s40195-019-00888-1

Special Issue: 2019年复合材料专辑

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Monitoring Damage Evolution in a Titanium Matrix Composite Shaft Under Torsion Loading Using Acoustic Emission

Xu Kong1,2, Yu-Min Wang1(), Xu Zhang1, Qing Yang1, Guo-Xing Zhang1, Li-Na Yang1, Rui Yang1()   

  1. 1 Institute of Metal ResearchChinese Academy of Sciences Shenyang China
    2 University of Chinese Academy of Sciences Beijing China
  • Received:2018-11-24 Revised:2019-01-11 Online:2019-10-10 Published:2019-09-17

Abstract:

The damage behaviors of a titanium matrix composite shaft under torsion loading were monitored using the acoustic emission technique. The composite shaft with SiC fibers at ± 45° orientations was prepared by the solid-state fabrication process. Both the torsional rigidity and torsional strength of the TMC shaft were improved by SiC fibers. The acoustic emission responses during the loading-unloading-reloading, under quasi-static and cyclic torsion tests were investigated. Multiple acoustic emission signals were grouped as mechanical noise, matrix deformation, interface debonding and fiber fracture using amplitude, waveform shape and frequency centroid parameters. A substantial reduction of signals generated by matrix deformation was found in the reloading test. During the quasi-static torsion test, interface debonding and progressive breaks of SiC fibers occurred. According to different acoustic emission behaviors, the failure process in the torsion fatigue test can be divided into three stages: the initial stage, the fiber fracture stage and the fast fracture stage.

Key words: Metal matrix composites (MMCs), Fracture, Fatigue, Acoustic emission, Torsion