A systematic study on the quality improving of fracture toughness measurement in structural ceramics by laser notching method

Wang, Anzhe; Zhao, Xinyuan; Huang, Mingxu; Cheng, Yehong; Zhang, Dongyang

doi:10.1016/j.tafmec.2021.102981

Cited by 11 publications

(9 citation statements)

References 61 publications

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“…Here, linear fitting are conducted on our previous test results (reported in Ref. [20]), and the β values of ZrB2-SiC, ZrB2, 5Y-TZP and SiC are obtained as 1.08, 0.962, 0.719 and 0.903 (see Fig. 4), respectively, which are consistent with the range from 0.7 to 1.3 reported by Yang et al [19].…”

Section: Comparison and Analysissupporting

confidence: 87%

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

Zhao

Wang

Chen

et al. 2021

Preprint

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Flaws in ceramics have a significant impact on their strength. Realization of ceramic strength from qualitative statistical description to quantitative prediction is essential for the fields of fracture mechanics, materials science and engineering applications. In this study, two regular flaw-strength prediction models with clear physical meaning were established under I-mode failure according to the classic crack-strength model (Sato [17]) combined with two critical stress intensity factor Kc vs. tip radius r relationships (Gómez [18] and Yang [19]). Comparison with the data that reported in the literature proved that the Sato-Yang model was more accurate than the Sato-Gómez model. On the basis of finite element simulation and mathematical fitting, a simple coefficient that can reasonably described the complexity of flaw shapes was proposed, thus extending the regular flaw-strength model to solve the irregular flaw problem and passing the experimental verification at the same time.

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Section: Comparison and Analysissupporting

confidence: 87%

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

Zhao

Wang

Chen

et al. 2021

Preprint

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“…where P is the maximum load of indentation test; A is the maximum contact area; E r is the effective elastic modulus defined by The macroscopic fracture toughness of composites (3 mm × 4 mm × 30 mm) was measured by the singleedge V-notched beam (SEVNB) method following the ISO 23146:2012 standard [42][43][44]. A 250-μm diamond grinding wheel was used to cut the U-shaped grooves, and then V-shaped notch was cut by the femtosecond laser (TruMicro 5000, TRUMPF, Germany) in the center of the root of the U-shaped grooves of the test rod.…”

Section: Measurements Of Phase Microstructure and Mechanical Propertiesmentioning

confidence: 99%

ZrB ₂–SiC spiral fibers prepared by combining liquid rope effect with non-solvent-induced phase separation method: A promising toughening material for ultra-high temperature ceramics

ZHANG¹,

Guo²,

Xing³

et al. 2023

Journal of Advanced Ceramics

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Spiral fibers were considered to be an ideal toughening phase of ultra-high torsional release effect. In this work, ZrB 2 (Z)-20 vol% SiC (S) spiral fiber (ZS sf ) with controllable structure was prepared by a combination approach of liquid rope effect and non-solvent-induced phase separation. Dominantly depended on the kinematic viscosity (η), dropping height (H), and flow rate (Q), the geometric parameters of ZS sf involving filament diameter (d) and coil diameter (D) were followed the relationship of d ≈ 0.516×10 −3 Q 1/2 H −1/4 and D ≈ 0.25×10 -3 (Q/H) 1/3 , respectively, within the optimized η of 10-15 Pa•s. Three different microstructures of ZS sf were achieved by adjusting the polymer/solvent/ non-solvent system assisted with phase diagram calculation, including dense, hollow, and hierarchical pore structures. The ZrB 2 -SiC with 1 wt% ZS sf composites prepared by hot isostatic pressing (HIP) exhibited a ~30% increase in fracture toughness (K IC , 4.41 MPa•m 1/2 ) compared with the ZrB 2 -SiC composite, where the microscopic fracture toughness of the ZS sf was ~80% higher than that of the matrix. The fibers with a ~10 nm in-situ-synthesized graphite phase amongst grain boundaries of ZrB 2 and SiC changed the fracture mode, and promoted the crack deflection and pull-out adjacent the interface of matrix and the fiber.

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“…However, some of our studies in recent years have initially found that a variety of ceramic samples, including certain types of zirconia, zirconium boride, zirconium boride-based ceramics, etc., were not suitable for the L chb criterion when the ratio of the notch root radius (ρ) to the material characteristic length (l ch ) exceeds or even falls within the range studied by Gómez. 10,11 The above phenomenon shows that the L chb criterion is deficient in the application range of material types and ρ values, and needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

Failure criterion for brittle materials with U‐notches: Unification of characteristic length‐based and grain size‐based criteria

Wang

Liu

et al. 2023

J Am Ceram Soc.

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Here, the limitations of characteristic length‐based (Lchb) and grain size‐based (Gb) criteria with two or three parameters were pointed out employing the apparent toughness tests of 12 different ceramics at a large span range of U‐notch root radius (ρ) values. After comprehensively considering the potential influencing factors of stress intensity factor (Kc), ρ divided by critical notch tip radius (ρc) was proposed as the independent variable, and the data of 21 materials (covering ceramics, plastics, resins, rocks, and metals) was summarized and discussed to establish a simple and more applicable Kc prediction model. Results indicated that Kc/KIc was a power function of ρ/ρc with a power exponent n of 0.5 for ideal materials and less than 0.5 for actual materials. It was also found that ρc can be calculated simply by KIc2/(πσ02), where σ0 represented the inherent strength. This semiempirical criterion succeeded in unifying the Lchb and Gb criteria without introducing more parameters to increase the prediction accuracy of the Kc at the U‐notch root for brittle materials like ceramics.

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A systematic study on the quality improving of fracture toughness measurement in structural ceramics by laser notching method

Cited by 11 publications

References 61 publications

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

ZrB ₂–SiC spiral fibers prepared by combining liquid rope effect with non-solvent-induced phase separation method: A promising toughening material for ultra-high temperature ceramics

Failure criterion for brittle materials with U‐notches: Unification of characteristic length‐based and grain size‐based criteria

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A systematic study on the quality improving of fracture toughness measurement in structural ceramics by laser notching method

Cited by 11 publications

References 61 publications

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

Quantitative Strength Prediction of Advanced Ceramics With Regular/Irregular Flaws in I-Mode Condition

ZrB 2–SiC spiral fibers prepared by combining liquid rope effect with non-solvent-induced phase separation method: A promising toughening material for ultra-high temperature ceramics

Failure criterion for brittle materials with U‐notches: Unification of characteristic length‐based and grain size‐based criteria

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ZrB ₂–SiC spiral fibers prepared by combining liquid rope effect with non-solvent-induced phase separation method: A promising toughening material for ultra-high temperature ceramics