J. Mater. Sci. Technol. ›› 2025, Vol. 231: 115-124.DOI: 10.1016/j.jmst.2024.12.079

• Research article • Previous Articles     Next Articles

Multi-scale analysis of SiCf/SiC composite dovetail considering realistic porosity facilitated by X-ray computed tomography

Dianyin Hua,b,c, Penghui Mad, Xin Lia,b,e, Ying Wanga,c,*, Yu Liud, Quan Zhua, Hao Dud, Xi Liub,c,d, Jiaxin Yangd, Rongqiao Wangb,c,d   

  1. aResearch Institute of Aero-Engine, Beihang University, Beijing 100191, China;
    bUnited Research Center of Mid-Small Aero-Engine, Beijing 100191, China;
    cBeijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China;
    dSchool of Energy and Power Engineering, Beihang University, Beijing 100191, China;
    eHunan Aviation Powerplant Research Institute, Aero Engine Corporation of China, Zhuzhou 412002, China
  • Received:2024-06-11 Revised:2024-10-28 Accepted:2024-12-06 Published:2025-10-01 Online:2025-03-04
  • Contact: *E-mail address: ywang1@buaa.edu.cn (Y. Wang).

Abstract: In this study, a multi-scale analysing strategy has been proposed to elucidate the effect of different scales of pores on the tensile performance of ceramic matrix composite (CMC) dovetails. The morphological characteristics and spatial distribution of pores in the CMC dovetails have been revealed in three dimensions by X-ray computed tomography. A multi-scale approach, taking into account the observed actual characteristics of different scales of pores, has been established to generate CMC dovetail models containing (1) both macro- and micro-pores, (2) macro-pores only and (3) no pores. The experimental and simulation results show good consistency when pores are accommodated (the error in peak load is 4.01%), highlighting the importance of considering pores when predicting the mechanical properties of CMC dovetails. It has been found that macro-pores play a vital role in degrading the stiffness and strength of the CMC dovetail structure. In terms of damage accumulation behaviour, the presence of micro-pores accelerates damage initiation in the form of matrix cracking, while macro-pores control the final fracture morphology of the dovetail structure.

Key words: Ceramic matrix composite, Pore size, Non-destructive testing, Finite element modeling, Stress concentration