Journal ArticleDOI
Notch‐Sensitivity of Fiber‐Reinforced Ceramic‐Matrix Composites: Effects of Inelastic Straining and Volume‐Dependent Strength
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TLDR
In this article, the effects of circular holes and sharp notches on the tensile strength of two Nicalon-reinforced ceramic composites have been investigated through measurements of the local strains in the regions of high stress concentration, coupled with finite element simulations of the test geometries, using a nonlinear constitutive law appropriate to ceramics.Abstract:
The effects of circular holes and sharp notches on the tensile strength of two Nicalon-reinforced ceramic composites have been investigated. The influence of inelastic straining on the redistribution of stress has been elucidated through measurements of the local strains in the regions of high stress concentration, coupled with finite element simulations of the test geometries, using a nonlinear constitutive law appropriate to ceramic composites. The scale dependence of strength has been inferred from tests performed on specimens of varying size. The utility of two failure models that incorporate both the inelastic straining and the scale dependence has been assessed: one based on the point stress failure criterion and the other on weakest-link fracture statistics. Both approaches provide a reasonably consistent description of the experimental measurements. Some of the implications and limitations associated with the failure models are discussed.read more
Citations
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On the mechanics of mother-of-pearl: a key feature in the material hierarchical structure
TL;DR: In this article, the structure of nacre is described over several length scales and the tablets were found to have wavy surfaces, which were observed and quantified using various experimental techniques.
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Deformation mechanisms in nacre
TL;DR: In this article, the inelastic deformation of Nacre from mollusc shells has been experimentally examined, with a focus on understanding the underlying mechanisms and their significance for the design of robust ceramics.
Journal ArticleDOI
An Experimental Investigation of Deformation and Fracture of Nacre–Mother of Pearl
TL;DR: In this paper, the uniaxial tension experiment performed on miniature nacre specimens was performed, and specific features of the microstructure and their relevance to associated toughening mechanisms were identified.
Journal ArticleDOI
Model for the robust mechanical behavior of nacre
TL;DR: In this article, a model for the inelastic behavior, measured in tension, along the axis of the aragonite plates was developed, based on observations for abalone nacre that the deformation is associated with periodic dilatation bands.
Journal ArticleDOI
Processing and Performance of an All‐Oxide Ceramic Composite
TL;DR: In this paper, a vacuum infiltration of aqueous mullite-alumina slurries into two-dimensional woven preforms of alumina fibers has been investigated, which shows stress-strain characteristics similar to other CFCCs, especially carbon-matrix composites.
References
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Journal ArticleDOI
Stress Fracture Criteria for Laminated Composites Containing Stress Concentrations
J.M. Whitney,R.J. Nuismer +1 more
TL;DR: In this paper, two related criteria based on stress distribution are presented for predicting the uniaxial tensile strength of laminated composites containing through the thickness discontinuities of a general shape.
Journal ArticleDOI
On the relationship between critical tensile stress and fracture toughness in mild steel
TL;DR: In this paper, the critical value of tensile stress (a) for unstable cleavage fracture to the fracture toughness (K,,) for a high-nitrogen mild steel under plane strain conditions.
Journal ArticleDOI
Microstructural design of toughened ceramics
TL;DR: In this article, the authors discute des mecanismes de renforcement des ceramiques par pontage des fissures a l'aide de trichites and d'autres types de renforcants discontinus.
Journal ArticleDOI
Macroscopic Fracture Mechanics of Advanced Composite Materials
TL;DR: In this paper, the application of classical fracture mechanics to laminated composites is discussed, and a convenient method is presented for predicting the static strength of a flawed specimen, compared with experimental data for specimens containing two types of flaws.
Journal ArticleDOI
Remarks on Crack-Bridging Concepts
Gang Bao,Zhigang Suo +1 more
TL;DR: In this article, a catalog of small-scale bridging solutions is compiled for idealized bridging laws, and a set of normalization is introduced to present the design charts, segregating the roles played by the shape and the scale, of a bridging law.
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