Multi-scale Methods for Investigating Mechanical Damage in Nuclear SiC Composite Cladding: A Review

doi:10.15541/jim20250494

Abstract

Abstract:

Silicon carbide (SiC) composite cladding has emerged as a disruptive fuel cladding technology in advanced nuclear energy systems, owing to its high specific strength, remarkable neutron irradiation resistance, and excellent high-temperature oxidation resistance, demonstrating significant potential to replace conventional zirconium alloy cladding. However, the structural complexity of SiC composites hinders a comprehensive understanding of their mechanical failure behavior under service conditions, which in turn constrains the pace of technological iteration. Therefore, to deeply reveal the damage mechanism of SiC composite cladding, accurately predict its stress-cracking risk in extreme environments, and further accelerate its engineering application, systematic multi-scale mechanical damage studies are essential. This review focuses on the research methodologies employed in multi-scale mechanical damage investigation of nuclear-grade SiC composite cladding. It covers macroscopic and micro-/nano-mechanical testing, in-situ monitoring and characterization techniques such as digital image correlation, X-ray computed tomography, and acoustic emission, as well as in-situ electron microscopy characterization and multi-scale numerical simulation. Significant progress has been achieved in this field: macroscopic mechanical tests can effectively characterize the overall mechanical performance of SiC composite cladding; multiple in-situ techniques enable multi-dimensional tracking of damage evolution from surface to interior and from static to dynamic processes; micro-/nano-mechanical testing provides critical support for obtaining mechanical parameters of key micro-constituents, including fibers, matrix, and interfaces; and multi-scale numerical simulations have established a predictive framework that effectively correlates microscopic mechanisms with macroscopic responses. Finally, prospects for future development and remaining challenges in this research area are outlined.

Key words: nuclear SiC composite cladding, multi-scale mechanical testing, in-situ characterization, multi-scale numerical simulation, review

CLC Number:

TB332

HUANG Gan, XUE Jiaxiang, TAN Caiwang, LIU Yang, ZHANG Guoliang, YANG Zhengmao, CHEN Zhaoke. Multi-scale Methods for Investigating Mechanical Damage in Nuclear SiC Composite Cladding: A Review[J]. Journal of Inorganic Materials, 2026, 41(9): 1157-1177.

Figures/Tables 16

Fig. 1 Schematic diagrams of the structure of the pressurized water reactor fuel assembly[5] and the SiC composite cladding (a) Pressurized water reactor fuel rod bundle assembly[5]; (b) SiC composite cladding tube

Fig. 2 Schematic diagrams of macroscopic mechanical tests for SiC composite cladding[16,23,32,34] (a) Uniaxial tension[16]; (b) Expansion due compression[23]; (c) Hydraulic burst test[32]; (d) C-ring compression[34]

Fig. 3 Four-point bending test results and SEM fracture surfaces of single/double-layer SiC braided tubes[49] (a) Single-layer; (b) Double-layer; (c) SEM fracture surfaces

Table 1 Brief comparison of macro-mechanical testing methods

Testing method	Core function	Key advantages	Main limitations
Uniaxial tension test	To obtain axial intrinsic mechanical properties (modulus, strength)	Standardized method, direct quantification of axial response	Primarily reflecting axial performance, differing from the actual hoop-stress-dominated stress state
Expansion due compression test	To evaluate the hoop strength and failure behavior of tubular specimens	Simple operation, short setup time	Suitable only for short tubes, prone to stress concentration leading to premature local failure
Hydraulic burst test	To evaluate the hoop strength and failure behavior of tubular specimens	Fluid medium ensures uniform hoop stress distribution, applicable to tubes of various lengths	Complex operation, high cost, safety risks from seal failure or fluid jetting
C-ring compression test	To determine hoop strength, especially suitable for high-temperature testing	Minimal sample requirement, easy implementation, ideal for high- temperature screening	Sensitive to defect distribution due to significant stress concentration
Four-point bending test	To assess flexural performance and overall structural integrity	Four-point bending provides a uniform and stable bending stress field	Absence of well-established research and standards for tubular specimens

Fig. 4 Images of the circumferential strain εhoop on the surface of the SiC cladding calculated by DIC[60] (a) Fault map under 0 N load; (b-d) Strain εhoop measurement results obtained within the elastic range: (b) 2100 N, (c) 2500 N, (d) 2730 N

Fig. 5 Compressive failure behavior of multi-coated SiC composite cladding in high temperature C-ring under in-situ XCT monitoring[69] (a) Meso-structure of the cladding tube showing the multi-layer coating and CMC matrix; (b) Schematic of the in-situ high-temperature C-ring compression test coupled with 3D-XCT imaging; (c) Real-time crack propagation and failure mechanisms at room temperature and 1200 ℃ under different load levels (0.58PU and 0.73PU, where PU is the maximum load applied (peak load))

Fig. 6 Quasi-static radial compression experiment of a three-layer SiC composite cladding under acoustic emission monitoring[85] (a) Schematic diagram of the test site; (b) Test equipment and test sample; (c) Schematic diagram of acoustic emission acquisition

Fig. 7 Example results of nanoindentation test and TEM images of fibers[91] (a) Nanoindentation illustration; (b) Radial distribution of the inclusions within a fiber; (c) Relationship between hardness and modulus varying with depth; (d) Cross-section of a fiber; (e) Inclusions at the grain boundaries of fibers; (f) EDX linescan signals of C and Si

Fig. 8 Schematic diagram of fiber push-out[94] (a) Sample preparation; (b) Process of fiber push-out

Fig. 9 SEM images of the micro-pillar after micro-pillar compression test[110] (a) Remaining part of the 55° pillar; (b) Top piece removed from the 55° pillar

Fig. 10 Schematic diagrams illustrating the microcolumn compression measurement of the fracture toughness of the PyC interface layer[111] (a, b) Schematic diagrams of microcolumn compression test; (c) Stress state and force balance of typical microcolumn compression structures; (d) Performance of interface layers of different thicknesses

Fig. 11 SEM images of a parallel oriented micro-cantilever before (a) and after (b) testing[119]

Table 2 Brief comparison of micro-/nano-mechanical testing methods

Testing Method	Core function	Key advantages	Main limitations
Nanoindentation	To measure hardness and elastic modulus of micro-regions (fiber, matrix, etc.)	Relatively simple sample preparation, enabling rapid property mapping via arrays	Susceptible to size effects and matrix constraint effects
Push-out/Push-in	To characterize the interfacial shear strength between fiber and matrix	Enabling direct use of bulk samples via push-in technique, avoiding preparation-induced damage	Requiring validation with other techniques due to indirect signal interpretation
Micro-pillar compression	To obtain the intrinsic strength and deformation behavior of micro-regions (e.g., interface)	Providing robust data via simple stress state, offering a realistic measure of interfacial bonding	Time-consuming FIB preparation with potential damage and significant size effects
Micro-cantilever bending	To measure the fracture toughness of micro-regions (fiber, matrix, etc.)	Enabling direct measurement of fracture toughness parameters	Highly dependent on precise FIB machining, which is complex and time-consuming

Fig. 12 SEM images of surface crack propagation paths under different load levels[125] In unreinforced matrix region: (a) 60 MPa, (b) 65 MPa, (c) 70 MPa; In transverse fiber bundles: (d) 60 MPa, (e) 65 MPa; In longitudinal fiber bundles: (f) 70 MPa

Fig. 13 Micro-scale RVE model of SiCf/SiC composite material and the contour maps of cumulative strain under different loading conditions[133] (a) Random fiber distribution; (b) Fiber groups; (c) Matrix groups; (d) Interface groups and contour maps of cumulative strain under different loading conditions; (e) Transverse tension; (f) Transverse compression; (g) Out-of-plane shear

Fig. 14 RVE model of SiC fiber bundle and three different models of SiC internal and external weaving structures[134] (a) SiC fiber bundle RVE model; (b) Braided structure inside B1; (c) Braided structure outside B1; (d) Braided structure inside B2; (e) Braided structure outside B2; (f) Braided structure inside B3; (g) Braided structure outside B3

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