Residual stress in ceramics with large thermal expansion anisotropy

Paulik, S. W.; Zimmerman, Michael H.; Faber, K. T.; Fuller, Edwin R.

doi:10.1557/jmr.1996.0354

Cited by 18 publications

(3 citation statements)

References 28 publications

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“…This type of thermally induced microcracking has been observed in a variety of ceramics and is often an advantageous and tailored material feature . 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 .…”

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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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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“…For a conceptual framework to guide our thinking on this problem, we draw upon the close analogy between thermal shock and electrochemical shock. In thermal shock, anisotropic materials such as Fe 2 TiO 5 undergo extensive microfracture 35,36 at grain boundaries and junctions. Large stresses are generated at these microstructural features due to the incompatible shape changes in neighboring, crystallographically misoriented grains.…”

Section: Introductionmentioning

confidence: 99%

Design criteria for electrochemical shock resistant battery electrodes

Woodford

Carter

Chiang

2012

Energy Environ. Sci.

156

134

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Mechanical degradation of electrode active materials (''electrochemical shock'') contributes to impedance growth of battery electrodes, but relatively few design criteria have been developed to mitigate fracture. Using micromechanical models and in situ acoustic emission experiments, we demonstrate and explain C-rate independent electrochemical shock in polycrystalline electrode materials with anisotropic Vegard coefficients. We conclude that minimizing the principal shear strain, rather than minimizing net volume change as previously suggested, is an important new design criterion for crystal chemical engineering of electrode materials for mechanical reliability. Polycrystalline particles of anisotropic Li-storage materials should be synthesized with primary crystallite sizes smaller than a material-specific critical size to avoid fracture along grain boundaries. Finally, we revise the electrochemical shock map construction to incorporate the material-specific critical microstructure feature sizes for C-rate independent electrochemical shock mechanisms, providing a simple tool for designing long-lived battery electrodes.

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“…This can then be compared to the grain boundary toughness. Typically a circular crack 2 l start of half the grain size g: l start ¼ g=4 is assumed [26], because a strong influence of grain size on microcracking has been observed [33]. The stress…”

Section: Ae Amplitude Estimatesmentioning

confidence: 99%

Elastic Discontinuities during Switching of Ferroelectric Ceramics

Hammer

2002

phys. stat. sol. (a)

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Several types of microscopic sources of elastic discontinuities are encountered in ferroelectric materials when subject to external loads. Domain switching, domain nucleation, microcracking, field induced crystallographic phase transitions, the motion of charged dislocations and frictional effects each occur under different loading conditions and generate acoustic emissions. Three compositions of lead zirconate titanate are compared for their acoustic emission patterns under electric field driving. Acoustic emission amplitudes are calculated for different source models and compared to experiment. The entire set of experiments allows a source assignment for this system. Implications for fatigue studies using the acoustic emission technique are briefly discussed.

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Residual stress in ceramics with large thermal expansion anisotropy

Cited by 18 publications

References 28 publications

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

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

Design criteria for electrochemical shock resistant battery electrodes

Elastic Discontinuities during Switching of Ferroelectric Ceramics

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