Journal ArticleDOI
Structure dependence of thermally induced microcracking in porcelain studied by acoustic emission
G. Kirchhoff,W. Pompe,H. A. Bahr +2 more
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TLDR
In this article, the initiation and growth of microcracks due to thermal stresses has been studied by applying the acoustic emission technique, which is approximately a superposition of two maxima near the phase transition of quartz and cristobalite.Abstract:
In porcelain during cooling the smaller thermal expansion coefficient of the glassy phase compared with the quartz particles causes radial tensile stresses and may create microcracks between these two components. The initiation and growth of microcracks due to thermal stresses has been studied by applying the acoustic emission technique. Different sources of microcracks are detected depending on thermal history. The acoustic emission spectrum is approximately a superposition of two maxima near the phase transition of quartz and cristobalite. Microcracking depends on particle size. With decreasing size of the quartz particles the maximum of microcrack activity shifts to lower temperatures.read more
Citations
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Fracture toughness and subcritical crack growth during high-temperature tensile deformation of Westerly granite and Black gabbro
Philip G. Meredith,BK Atkinson +1 more
TL;DR: In this article, double torsion testing was used to determine catastrophic and subcritical crack propagation parameters for pre-cracked specimens of Westerly granite and Black gabbro under a number of environmental conditions.
Journal ArticleDOI
Damage evolution in ferroelectric PZT induced by bipolar electric cycling
TL;DR: In this article, the fatigue behavior of commercial bulk Lead Zirconate Titanate (PZT) induced by bipolar cycling was investigated, and the authors found that higher cycling fields (2× E c ) yield stronger fatigue, higher AE energy values and lower threshold values for the onset of AE events at high cycle numbers.
Journal ArticleDOI
Microstructural controls on the physical and mechanical properties of edifice‐forming andesites at Volcán de Colima, Mexico
Michael J. Heap,Yan Lavallée,L. Petrakova,Patrick Baud,Thierry Reuschlé,Nick Varley,Donald B. Dingwell +6 more
TL;DR: In this paper, the authors evaluate the interplay between microstructure and rock properties for a suite of edifice-forming rocks from Volcan de Colima (Mexico) and find that porosities are high and range from 8 to 29% as a consequence, elastic wave velocities, Youngs moduli, and uniaxial compressive strengths are low, and permeabilities are high.
Journal ArticleDOI
The influence of thermal-stressing (up to 1000 °C) on the physical, mechanical, and chemical properties of siliceous-aggregate, high-strength concrete
Michael J. Heap,Yan Lavallée,A. Laumann,Kai-Uwe Hess,Philip G. Meredith,Donald B. Dingwell,S. Huismann,Frank Weise +7 more
TL;DR: In this paper, the influence of thermal-stressing on high-strength concrete (HSC) properties was studied and it was shown that residual compressive strength, indirect tensile strength, ultrasonic wave velocities, and Young's modulus and Poisson's ratio decrease with increasing temperature.
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A Review of Heat Treatment Research
Marian Domanski,John Webb +1 more
TL;DR: In this article, the authors identify two methods of intentional thermal alteration: controlled heat treatment most commonly used to enhance the flaking quality of stone, and thermal shock fracturing often applied to produce angular facets on rounded nodules of tough lithologies.
References
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Book
Fracture Mechanics of Ceramics
TL;DR: In this article, a linear-elastic fracture mechanics can be applied to describe the failure behavior of small flaws in ceramic materials, which is caused by the extension of small faults.
Journal ArticleDOI
Microfracture from thermal expansion anisotropy—I. Single phase systems
TL;DR: In this paper, the onset of microfracture associated with thermal expansion anisotropy has been calculated for single phase polycrystals, emphasizing the grain orientations and shapes that yield the maximum stress intensification at boundary located defects.
Journal ArticleDOI
Grain-Size Dependence of Spontaneous Cracking in Ceramics
Roy W. Rice,R. C. Pohanka +1 more
TL;DR: In this article, a model based on energy and stress considerations is applied to the phenomenon of spontaneous fracture of materials due to phase transformations and thermal expansion anisotropy, and results are shown to be in reasonable agreement with observations of the grain-size dependence of such cracking and the effects of internal stresses on strength.
Journal ArticleDOI
Acoustic emission and crack propagation in polycrystalline alumina
TL;DR: In this paper, the authors measured acoustic emission during the fracture of polycrystalline alumina and showed that acoustic emission is obtained during macrocrack growth, which can be used for failure indication.