In-situ Young's moduli of the constitutive layers in a solid oxide fuel cell

Pandey, Amit Kumar; Shyam, Amit; Liu, Zhien; Goettler, Richard

doi:10.1016/j.jpowsour.2014.09.123

Cited by 8 publications

(4 citation statements)

References 54 publications

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“…• Non-linearity in the stress-strain response at higher strains due to mechanically induced microcracks interacting with thermally induced microcracks by crack propagation and linkage [57,58]. The non-linearity leads to a deviation from the linear elastic deformation that all the discussed models for K IC -p, σ-p and E-p are predicated upon.…”

Section: Effect Of Microstructural Parameters On Young's Modulus Strmentioning

confidence: 99%

The effect of porosity and microcracking on the thermomechanical properties of cordierite

Shyam

Bruno

Watkins

et al. 2015

Journal of the European Ceramic Society

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The effect of porosity and microcracking on the mechanical properties (strength, fracture toughness, Young's modulus, and fracture energy) and thermal expansion of diesel particulate filter (DPF) grade cordierite materials has been investigated. A method to deconvolute the effect of porosity and microcracking on Young's modulus is proposed. In addition, the microcrack density and the pore morphology factor are calculated by applying a micromechanical differential scheme. The values of the investigated mechanical properties are shown to decrease with an increase in porosity, but the thermal expansion values are insensitive to porosity. The variation in mechanical properties as a function of porosity leads to distinct porosity dependence of thermal shock resistance for crack initiation and crack propagation for DPF grade synthetic cordierite.

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Section: Effect Of Microstructural Parameters On Young's Modulus Strmentioning

confidence: 99%

The effect of porosity and microcracking on the thermomechanical properties of cordierite

Shyam

Bruno

Watkins

et al. 2015

Journal of the European Ceramic Society

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“…Consequently, the formation and propagation of microcracks has been studied as a function of many parameters including grain size and orientation, and elastic and thermal anisotropy . Other studies have attempted to examine the effect of microcracking on the macroscopic properties and behavior of the microcracked ceramic . However, despite the maturity of this field, to the authors' knowledge, no analytical model has been presented that can predict the elastic modulus evolution as a function of temperature history.…”

Section: Introductionmentioning

confidence: 99%

Towards Prediction of Thermally Induced Microcrack Initiation and Closure in Porous Ceramics

Fertig

Nickerson

2015

J. Am. Ceram. Soc.

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This article describes development of a model to predict microcrack density evolution as a function of thermal history in porous ceramics with anisotropic thermal expansion coefficients. The model is based on the evolution of statistical distributions of grain-boundary stresses and crack opening displacements (CODs), and represents universal cracking and crack closure behavior scaled by coefficients that depend on the microstructure and material properties. The functional forms for this model were developed from a 2D finite element simulation of thermally induced microcracking. Specifically, the grain-boundary stresses and CODs were studied, and a parameter describing each quantity was calibrated from modulus hysteresis data. An additional calibration parameter was also introduced to link crack density to macroscopic behavior. The model was applied to experimental results from a porous cordierite ceramic and shown to accurately describe its behavior. K. Faber-contributing editor Manuscript No. 36058. J ournalto microcrack growth and the bilinear transition point was manually selected with net results shown in Fig. 2.

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“…1 It is this combination that has made in situ micromechanical testing useful for various engineering applications. 2 Experimental techniques used in this special topic include in situ transmission electron microscopy (TEM) tests for analyzing Cu-Au interface, micro-pillar compression experiments to study the effect of interfaces on plasticity in lath martensite, drop hammer tests with thermal imaging to study the effect of impact loading on microstructure-dependent properties of energetic materials, hot compression tests to undertstand the influence of temperature and strain rate on microstructural evolution in titanium aluminide alloys, and bending tests for studying creep in metallic materials. Although significant progress has been made in in situ testing approaches using x-ray diffraction and electron microscopy, there are still challenges that need to be addressed.…”

mentioning

confidence: 99%