the fracture of brittle materials testing and analysis

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The Fracture Of Brittle Materials

Author : Stephen Freiman
ISBN : 9781118147788
Genre : Science
File Size : 73. 1 MB
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Supports the use and development of strong, fracture-resistant, and mechanically reliable ceramic materials The Fracture of Brittle Materials thoroughly sets forth the key scientific and engineering concepts underlying the selection of test procedures for fracture toughness, strength determination, and reliability predictions. With this book as their guide, readers can confidently test and analyze a broad range of brittle materials in order to make the best use of existing materials as well as to support the development of new materials. The authors explain the importance of microstructure in these determinations and describe the use of quantitative fractography in failure analysis. The Fracture of Brittle Materials is relevant to a broad range of ceramic materials (i.e., any inorganic non-metal), including semiconductors, cements and concrete, oxides, carbides, and nitrides. The book covers such topics as: Basic principles of fracture mechanics underlying brittle material tests and analysis procedures Theory and mechanisms of environmentally enhanced crack growth Fracture mechanics tests to determine a material's resistance to fast fracture Test and analysis methods to assess the strength of ceramics Methods to analyze the fracture process based on quantitative measurements of the fracture surface Effect of a material's microstructure Methods for predicting the lifetime of brittle components under stress Throughout the book, figures and illustrations help readers understand key concepts and methods. Replete with real-world examples, this text enables engineers and materials and ceramics scientists to select and implement the optimal testing methods for their particular research needs and then accurately analyze the results.

Microstructure Property Correlations For Hard Superhard And Ultrahard Materials

Author : Valentine Kanyanta
ISBN : 9783319292915
Genre : Technology & Engineering
File Size : 85. 55 MB
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This book discusses microstructure-property correlations and explores key microstructure features and how they affect the properties of a material. The authors discuss the effect of manufacturing and processing routes on microstructure and properties. They identify appropriate microstructure and mechanical characterization techniques essential for developing accurate microstructure-property relationships. The techniques include high resolution imaging methods and properties measurements such as hardness, strength, elastic modulus, and fracture toughness. Current and future trends in hard and superhard material design are revealed by the authors, including nanostructured materials, biomimicry, and novel manufacturing technologies.

Fracture Mechanics Applied To Brittle Materials

Author : S. W. Freiman
Genre : Brittleness
File Size : 69. 35 MB
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Methods For Assessing The Structural Reliability Of Brittle Materials

Author : S. W. Freiman
ISBN : 0803102658
Genre : Brittleness
File Size : 81. 6 MB
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Automation In Fatigue And Fracture

Author : C. Amzallag
ISBN : 0803119852
Genre : Fracture mechanics.
File Size : 66. 6 MB
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Micro Scale Fracture Toughness Testing And Finite Element Analysis In Brittle Materials

Author : Wanjun Cao
ISBN : 1303478250
Genre :
File Size : 75. 4 MB
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Grain boundaries play a very important role in determining the mechanical properties of polycrystalline ceramics. In particular, the addition of certain dopants or impurities can cause significant changes in fracture path and fracture toughness. While substantial progress has been made in the past few decades, there remains an active debate about the fundamental mechanism of how the grain boundary segregation influences the mechanical properties. Prior studies have revealed limitations of the conventional macro-scale mechanical testing technique since dopants not only alter grain boundary structure they also influence the grain size, grain anisotropy and porosity that all contribute to the mechanical properties of polycrystalline bulk samples. Small-scale mechanical testing offers an opportunity to minimize the number of variables to obtain information about the mechanical properties of a single grain boundary, thus enabling direct correlations between grain boundary structures and mechanical properties. Three different micro-scale mechanical testing techniques--including Compression Splitting, Double Torsion and Micro-cantilever Deflection test methods--were examined and the Micro-cantilever Deflection test was selected for this project. At the beginning, tests were performed in single crystal magnesium aluminate spinel (MgAl2O4). Five distinct orientation cantilever specimens were prepared by Focused Ion Beam (FIB) technique and loaded by a dedicated in-situ nano-indentation system. Anisotropic finite element analysis was performed and the influence of the material's anisotropy on the stress intensity factor was determined. Orientation dependent fracture behaviors of different specimens were observed and associated with a mixed-mode loading condition and anisotropic mechanical properties of spinel single crystal. A maximum tensile stress fracture criterion for anisotropic materials was used to determine the fracture toughness values of fracture planes as the crack deflected at certain angles. Good agreement of fracture toughness values for {100} planes was obtained between the micron-scale measurements and macroscopic results available in the open literature. Lower bounds for the fracture toughness of {110} and {111} orientations were also obtained. After the technique had been validated, the Micro-cantilever Deflection test technique was then applied to test bi-crystal grain boundaries. The effect of ytterbium (Yb) on magnesium aluminate spinel (MgAl2O4) grain boundary structure and strength has been evaluated. Doped and updoped interfaces were characterized using atomic resolution High Angle Annular Dark Field (HAADF) imaging. Interface fracture toughness was determined using a micro-scale cantilever beam test. A 30% increase in fracture toughness was found to correlate with grain boundary Yb segregation. Finally, the Micro-cantilever Deflection beam deflection test was introduced to measure the fracture toughness and investigate fracture mechanisms of electrodeposited Ni-W coatings exposed to different heat treatment conditions. As deposited Ni-W films were found to be amorphous and to exhibit a ductile fracture behavior while after heat treatment nanocrystalline Ni-W exhibited a brittle fracture behavior. By introducing nano-scale sharp pre-cracks, the nanocrystalline Ni-W fracture surface exhibited an intergranular morphology that has never been reported before to our knowledge. In addition, the fracture path of nanocrystalline Ni-W was along boundaries of grain boundary agglomerates that can be directly correlated with an agglomerate cooperative motion model proposed in previous reports.

Fracture Resistance Testing Of Monolithic And Composite Brittle Materials

Author : Jonathan A. Salem
ISBN : 0803128800
Genre : Science
File Size : 66. 75 MB
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From a November 2000 symposium in Orlando, Florida, 14 papers review the new standards promulgated by American, European, and Japanese professional associations for testing fracture toughness, slow crack growth, and biaxial strength in brittle ceramics. They address a variety of topics regarding imp

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