๐”– Bobbio Scriptorium
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A review of indentation fracture theory: its development, principles and limitations

โœ Scribed by P. Ostojic; R. McPherson

Publisher
Springer Netherlands
Year
1987
Tongue
English
Weight
1016 KB
Volume
33
Category
Article
ISSN
1573-2673

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โœฆ Synopsis

The influence of 'blunt' and 'sharp' indenters in producing indentation crack patterns is outlined. Attention is then focused on the initiation and propagation of cracks formed during a sharp contact event as such contacts are of the most practical interest and are commonly used to determine the fracture toughness of opaque materials. The modifying influence on the behaviour of such cracks as a result of anisotropy, particle size, environment and residual stress effects is briefly discussed. A simplistic derivation of the current formula used in determining the fracture toughness of suitable materials from a sharp contact event is then given. The criteria for valid results are also presented and these, in conjunction with other points discussed, highlight some of the limitations of this method of toughness testing.

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On the principles of limiting absorption
On the principles of limiting absorption and limit amplitude for a class of locally perturbed waveguides. Part 1: Time-independent theory
โœ K. Morgenrรถther; P. Werner ๐Ÿ“‚ Article ๐Ÿ“… 1988 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 987 KB

Let R be a local perturbation of the n-dimensional domain R, = R"x (0, n). In a previous papers we have introduced the notion of an admissible standing wave. We shall prove that the principle of limiting absorption holds for the Dirichlet problem of the reduced wave equation in R at o t 0 if R does