Not All Microcracks are Born Equal: Thermal vs. Mechanical Microcracking in Porous Ceramics

Bruno, Giovanni; Efremov, Alexander; An, Chong; Nickerson, Seth

doi:10.1002/9781118095263.ch13

Cited by 19 publications

(16 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We first notice the typical hysteresis upon heating-cooling cycles, due to microcrack closure-reopening cycles. 2,4,34 This is more visible in AT because of the larger microcrack density. Upon Fig.…”

Section: Resultsmentioning

confidence: 92%

Impact of the non-linear character of the compressive stress–strain curves on thermal and mechanical properties of porous microcracked ceramics

Bruno¹,

Kilali²,

Efremov³

2013

Journal of the European Ceramic Society

Self Cite

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 92%

Impact of the non-linear character of the compressive stress–strain curves on thermal and mechanical properties of porous microcracked ceramics

Bruno¹,

Kilali²,

Efremov³

2013

Journal of the European Ceramic Society

Self Cite

View full text Add to dashboard Cite

“…Microcracking is responsible for hysteresis in the thermal expansion and stiffness versus temperature curves (see data on magnesium titanate, aluminum titanate, NZP ceramics, and cordierite) and has been directly observed in SEM studies (e.g., Shyam et al; Harada). Microcracking is also responsible for the nonlinearity of the stress–strain curves, especially in porous ceramics .…”

Section: Microstresses Due To Cooling Of Polycrystalline Ceramics: Dementioning

confidence: 99%

“…Predictions of the model can be compared with available data on porous cordierite. Figure (a) shows the dependence of Young's modulus (normalized to the maximum measured value) of cordierite for diesel particle filter applications . The typical microstructure is shown in Fig.…”

Section: Microstresses Due To Cooling Of Polycrystalline Ceramics: Dementioning

confidence: 99%

“…Its porosity is about 53% (as determined by mercury intrusion). Young's modulus was determined by sonic resonance measurements on honeycomb specimens with dimensions 12 mm × 25 mm × 150 mm according to ASTM standards, using a Corning Inc. in‐house built device . Upon heating, the effective Young's modulus increases, due to microcrack closure, while cooling produces delayed microcrack opening, and the stiffness starts decreasing at about 650°C.…”

Section: Microstresses Due To Cooling Of Polycrystalline Ceramics: Dementioning

confidence: 99%

“…(a) Young's modulus of cordierite honeycomb filter material normalized to the maximum measured value; (b) microstructure of cordierite . In the porous and microcracked E 0ϕm and the solely porous E 0ϕ Young's moduli at room temperature are indicated, as well as the temperatures for onset (dashed arrow) and avalanche (solid arrow) microcracking.…”

Section: Microstresses Due To Cooling Of Polycrystalline Ceramics: Dementioning

confidence: 99%

See 2 more Smart Citations

Microstructure–Property Connections for Porous Ceramics: The Possibilities Offered by Micromechanics

Bruno

Kachanov

2016

J. Am. Ceram. Soc.

Self Cite

View full text Add to dashboard Cite

Microstructure of porous ceramics is highly “irregular”: it comprises pores and microcracks of diverse shapes and orientations. This makes their quantitative modeling challenging, and one often resorts to empirical relations containing fitting parameters and having somewhat uncertain range of applicability. We review the substantial progress made in modeling of “irregular” microstructures that does not seem to have been sufficiently utilized in the context of ceramics. We discuss the possibilities offered by micromechanics in developing microstructure–property relations for porous microcracked ceramics. After an overview of relevant micromechanics topics, we focus on several issues of specific interest for ceramics: nonlinear stress–strain behavior, effective elastic properties, and thermally induced microcracking. We discuss extraction of microscale parameters (such as strength of the intergranular cohesion, density of cracks and pores, etc.) from macroscopic data and identify the extent of uncertainty in this process. We also argue that there is no quantitative correlation between fracturing process and the loss of elastic stiffness.

show abstract

On the Morphological and Crystallographic Anisotropy of Diesel Particulate Filter Materials

et al. 2021

Self Cite

View full text Add to dashboard Cite

The determination of the anisotropy of materials’ microstructure and morphology (pore space) in diesel particulate filter (DPF) materials is an important problem to solve, since such anisotropy determines the mechanical, thermal, and filtration properties of such materials. Through the use of a dedicated (and simple) segmentation algorithm, it is shown how to exploit the information yielded by 3D X‐ray computed tomography data to quantify the morphological anisotropy. It is also correlated that such anisotropy of the pore space Such anisotropy of the pore space is also correlated with the microstructure and crystallographic anisotropy of the material in several showcases: a microstructurally isotropic material, such as SiC, and some morphologically and microstructurally anisotropic cordierite materials. In the later case, the finer the grain size, the more isotropic the microstructure.

show abstract

Not All Microcracks are Born Equal: Thermal vs. Mechanical Microcracking in Porous Ceramics

Cited by 19 publications

References 12 publications

Impact of the non-linear character of the compressive stress–strain curves on thermal and mechanical properties of porous microcracked ceramics

Impact of the non-linear character of the compressive stress–strain curves on thermal and mechanical properties of porous microcracked ceramics

Microstructure–Property Connections for Porous Ceramics: The Possibilities Offered by Micromechanics

On the Morphological and Crystallographic Anisotropy of Diesel Particulate Filter Materials

Contact Info

Product

Resources

About