By David J. Barber, Philip G. Meredith (auth.)
This monograph has its origins in a two-day assembly with an identical name held in London, England within the spring of 1987. the assumption for the assembly got here from contributors of the united kingdom Mineral and Rock Physics team. It was once held below the auspices of, and made attainable by means of the beneficiant aid of, the Mineralogical Society of significant Britain and eire. extra monetary tips used to be supplied by way of ECC foreign pIc and the Cookson workforce pIc. The goals of the London assembly have been to survey the present nation of information approximately deformation tactics in non-metallic fabrics and to assemble either specialists and not more skilled Earth scientists and ceramicists who more often than not had little touch yet shared universal pursuits in deformation mechanisms. This monograph has related goals and, certainly, such a lot of its authors have been keynote audio system on the assembly. hence, lots of the contributions include a evaluation aspect as well as the presentation and dialogue of latest effects. In adopting this structure, the editors wish that the monograph will supply a necessary state of the art sourcebook, either to lively researchers and in addition to graduate scholars simply beginning within the correct fields.
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Additional info for Deformation Processes in Minerals, Ceramics and Rocks
These models are succinctly reviewed by Paterson (1978), so only a summary is presented here. 24b) where at is the uniaxial tensile strength. g. McLintock & Walsh 1962). 25) This criterion has the advantage that it takes account of intermediate principal stresses and that it provides a more realistic ratio of the uniaxial compressive strength to the uniaxial tensile strength of 12. 26) where a and (3 are constants that depend on the Poisson ratio and the aspect ratios of the elliptical cavities.
18). One way to overcome this problem is through the use of a suitable statistical distribution of pre-existing flaw sizes. Obviously, since naturally occurring flaws are distributed over a range of sizes and shapes, it follows that the tensile failure stress is not a unique quantity, but will vary statistically in a manner similar to the flaw distribution (Costin 1987). This combination of a highly non-linear constitutive relation with such sensitivity to initial conditions makes the accurate prediction of failure times very difficult to achieve in practice for polycrystalline materials.
Quiescence may be a real or an instrumental phenomenon, and a number of possible explanations is discussed by Meredith et at. (1990). Ohnaka & Mogi (1982) and Sondergeld et at. (1984) report changes in the frequency content of emissions during progressive deformation, which they attribute to the changing microstructure. Once dilatancy is well developed, microcracks interact and link to form larger cracks and hence larger source dimensions, and this is associated with an increase in the low-frequency content of AE signals.
Deformation Processes in Minerals, Ceramics and Rocks by David J. Barber, Philip G. Meredith (auth.)