Hole Size Dependence of Open-hole Tensile Mechanical Property of MI-SiCf/SiC Composites

doi:10.15541/jim20250347

Abstract

Abstract: To meet the design requirements for perforated structures in aero-engine hot-section components made of MI-SiC_f/SiC composites, this study prepared unnotched specimens and five types of open-hole specimens with different diameters (D=1-9 mm), and conducted room-temperature tensile tests. By integrating digital image correlation (DIC) and acoustic emission (AE) techniques, the full-field strain evolution and internal damage signals were monitored in real time, systematically elucidating the influence of hole diameter on damage initiation threshold and evolution behavior. A three-dimensional finite element model was established to analyze the competing mechanisms between material nonlinearity, stress concentration at the hole-edge, and stress interaction at the hole-edge. The results indicate that the open-hole tensile strength exhibits a nonlinear relationship with the hole diameter: when D≤3 mm, the strength increases slowly with increasing diameter, whereas it decreases sharply for D>3 mm. A critical threshold exists concerning the width-to-diameter ratio (W/D): specifically, when W/D<3, stress concentration interference between the hole and the specimen edge leads to a pronounced decline in load-bearing capacity, with geometric effects dominating the failure behavior. Moreover, damage initiation stress decreases with increasing hole diameter. Specimens with small-hole (D≤3 mm) maintain a sequential damage evolution process, while specimens with large-hole (D>3 mm) exhibit concurrent multiple damage modes. Finite element analysis reveals that the stress peak shifts away from the hole edge once the material enters the nonlinear stage, resulting in early failure in specimens with diameter of 1~2 mm due to the overlap between the high-stress zone and inherent material defects. Larger holes require a larger stress redistribution zone; when W/D exceeds the critical value of 3, the available material width becomes insufficient, ultimately a sharp decrease in nominal tensile strength. In conclusion, the optimal open-hole tensile performance of MI-SiC_f/SiC composites is achieved at a hole diameter of 3 mm. Reinforcement design are recommended for open-hole structures with W/D<3.

Key words: MI-SiC_f/SiC composite, open-hole tensile, hole diameter effect, digital image correlation, acoustic emission

CLC Number:

V231
TB332

WANG Yana, SONG Jiupeng, WANG Hairun, LI Tianshan, JIAO Jian. Hole Size Dependence of Open-hole Tensile Mechanical Property of MI-SiC_f/SiC Composites[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250347.

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Hole Size Dependence of Open-hole Tensile Mechanical Property of MI-SiC_f/SiC Composites

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