Influence of the load application rate and the statistical model for brittle failure on the bending strength of extruded ceramic tiles

Defez, Beatriz; Perís-Fajarnés, Guillermo; Santiago, V.; Soria, José Manuel Nieto; Lluna, Eduardo

doi:10.1016/j.ceramint.2012.10.022

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…e higher the value of m, the more reliable is the results of the mechanical properties [32] (Figure 8). e correlation factors, R 2 , presented in Table 2, were higher than 0.800, which can be considered as satisfactory [33]. e in vitro bio lm formed on the mandible was reduced when compared to the biomass bio lm formed on commercial bone grafts.…”

Section: Resultsmentioning

confidence: 84%

Influence of Sintering Temperature on Mechanical Properties of Glass-Ceramics Produced with Windshield Waste

Gualberto

Lopes

Silva

et al. 2019

International Journal of Chemical Engineering

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In this work, glass-ceramics were produced with mechanical and physical properties, using recycled glass powder from windshields as raw material. The glass powder was formed and sintered at temperatures 600, 650, 700, 750, and 800°C. Pieces were also produced with the addition of niobium oxide to the glass powder. The flexural strength and the Archimedes density of the produced parts were determined. The reliability of the results was evaluated by the Weibull statistic. X-ray diffraction was performed. Maximum flexural strength was 77.64 MPa at 750°C, with the addition of niobium oxide at 43.86 MPa at 700°C. X-ray diffraction showed crystalline structures in the specimens with the addition of the nucleating agent, confirming the production of glass-ceramics in this composition. The pure glass powder only crystallized from 750°C. The Nb2O5 favors the formation of crystalline structures in the vitreous matrix at low temperatures and with piezoelectric structures.

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Section: Resultsmentioning

confidence: 84%

Influence of Sintering Temperature on Mechanical Properties of Glass-Ceramics Produced with Windshield Waste

Gualberto

Lopes

Silva

et al. 2019

International Journal of Chemical Engineering

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“…The lower sintering temperature, G1, G4 and G8 showed very low Weibull modulus, justifying the incomplete sintering of the specimens, which results in lower homogeneity of the specimens, with open pores in most of the specimens, which generates the lower specimen density. All the R² correlation factors were close to or above 0.9, and according to Defez et al, who use 0.75 as the lowest acceptable value of the correlation factor for Weibull's analysis [22], it was considered acceptable, all factors of all groups of studies. Figure 6 shows the comparative and qualitative analysis of the correlation factor for all groups.…”

Section: Resultsmentioning

confidence: 80%

Glass-ceramic produced with recycled glass

et al. 2019

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The objective of this work is the production and characterization of glass-ceramic with recycled glass powder and 4% (w/w) of cerium dioxide. Eleven groups were defined with conformation pressure of 11.6 and 25.8 MPa, and cerium dioxide addition. The sintering temperatures of 650, 675, 700 and 750 °C were used. The raw material was formed into a mold with a uniaxial pressure. The density was measured by the Archimedes principle. The water absorption of the groups was also determined, as linear contraction percentage and the crystalline structure. The flexural strength was obtained by the three-point bending test and the results analyzed by the Weibull analysis. The specimens presented density ranging from 1.99 to 2.38 g/cm3. Increasing the temperature provided an increase in the density of the specimens and the flexural strength. At higher sintering temperature, this behavior was not observed. The highest flexural strength was 63.55 MPa, obtained at the sintering temperature of 700 ºC, conformed with 25.8 MPa, only glass powder. The increase in the forming pressure favored crystallization. The addition of cerium dioxide favored for the increase density and the Weibull modulus, but decrease of the flexural strength.

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“…Slight differences may be attributed to an increase (or decrease) in the brittle characteristic of the material, which is reflected in the surface roughness of the fracture surface. 19 Rough fracture surfaces generally have larger m values than flat fracture surfaces, such as X-cut, Z-cut, and (44°,180°)-cut samples as shown in Figures 7 and 8.…”

Section: Bending Strength Results and Samplementioning

confidence: 89%

“…The size distribution of inevitable defects in the material is believed to be a contributing factor toward the scatter of failure strength . In previous reports, when other brittle materials such as silicon, glass, ceramics, and so forth were tested on fracture mechanics, a large variability in measured strengths was also observed. The variability of the fracture stress was reduced in some studies by the introduction of pre-cracks in samples .…”

Section: Results and Discussionmentioning

confidence: 99%

Study of Static Flexural Strength Anisotropy of Yttrium Calcium Oxyborate Crystals

Ren

Chen

et al. 2023

Crystal Growth & Design

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As a promising optical and piezoelectric crystal, yttrium calcium oxyborate (YCOB) has been criticized for its easy fracture during both the cooling and machining processes. Herein, in order to evaluate the mechanical energy (G) required for crack propagation on one crystal plane, we measured the bending strength of the YCOB samples with different orientations via employing a three-point bending test. The surface topography of the polished sample was measured, and the average surface roughness is limited to 10 nm. Fracture surfaces were also observed and analyzed. The results showed that the bending strengths of Y-cut and Z-cut samples were higher than other cut directions in the XZ principal plane, showing obvious anisotropy. It can be found that the cleavage planes and (101) were always observed in fractured samples in multiple directions in the XZ principal plane. The contribution of the cleavage planes and (101) to the fracture of the specimens was discussed in detail by the theorem of energy minimum. Finally, based on the obtained scanning electron microscopy results, we propose the mechanism for crack advance in YCOB crystals. A perfectly brittle crack in a crystal prefers cleavage planes with low surface energy. It is believed that these findings may provide fresh ideas to overcome the cleavage fracture of larger size YCOB crystals.

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Influence of the load application rate and the statistical model for brittle failure on the bending strength of extruded ceramic tiles

Cited by 7 publications

References 13 publications

Influence of Sintering Temperature on Mechanical Properties of Glass-Ceramics Produced with Windshield Waste

Influence of Sintering Temperature on Mechanical Properties of Glass-Ceramics Produced with Windshield Waste

Glass-ceramic produced with recycled glass

Study of Static Flexural Strength Anisotropy of Yttrium Calcium Oxyborate Crystals

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