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Boudinaged quartz vein (with strain fringe) showing sinistral shear sense, Starlight Pit, Fortnum Gold Mine, Western Australia
Plasticity theory for rocks is concerned with the response of rocks to loads beyond the elastic limit. Historically, conventional wisdom has it that rock is brittle and fails by fracture while plasticity is identified with ductile materials. In field scale rock masses, structural discontinuities exist in the rock indicating that failure has taken place. Since the rock has not fallen apart, contrary to expectation of brittle behavior, clearly elasticity theory is not the last word.[1]
Theoretically, the concept of rock plasticity is based on soil plasticity which is different from metal plasticity. In metal plasticity, for example in steel, the size of a dislocation is sub-grain size while for soil it is the relative movement of microscopic grains. The theory of soil plasticity was developed in the 1960s at Rice University to provide for inelastic effects not observed in metals. Typical behaviors observed in rocks include strain softening, perfect plasticity, and work hardening.
Application of continuum theory is possible in jointed rocks because of the continuity of tractions across joints even through displacements may be discontinuous. The difference between an aggregate with joints and a continuous solid is in the type of constitutive law and the values of constitutive parameters.
^Pariseau (1988).
and 21 Related for: Rock mass plasticity information
wisdom has it that rock is brittle and fails by fracture while plasticity is identified with ductile materials. In field scale rock masses, structural...
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deformations when a load level is reached. Rate-dependent plasticity is important for transient plasticity calculations. The main difference between rate-independent...
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improve the plasticity of kaolinite clay used for pottery. One of the first findings of bentonite was in the Cretaceous Benton Shale near Rock River, Wyoming...
stress–strain curve. This implies that the material response has time-dependence. Plasticity – Materials that behave elastically generally do so when the applied stress...
geological information and site characteristics, e.g. properties of soil/rockmass, slope geometry, groundwater conditions, alternation of materials by faulting...
given level of stress and temperature, more than one of the creep and plasticity mechanisms may be active. The boundaries between the fields are determined...
surrounding rock. The term was introduced by Romanian geologist Ludovic Mrazek, who was the first to understand the principle of salt tectonics and plasticity. The...
controller, a concept in automation and control engineering Plasticity index, a measure of the plasticity of a soil Polyimide, a polymer of imide monomers Preußische...
cases, can be at least 300 m (1,000 ft) deep. Beneath this point, the plasticity of the ice prevents the formation of cracks. Intersecting crevasses can...
clays are classified by plotting the values of their plasticity index and liquid limit on a plasticity chart. The A-Line on the chart separates clays (given...
contraction, and consolidation) and shearing behavior with the theory of plasticity using critical state soil mechanics. Critical state soil mechanics is...
helium balloon in a moving car. During a period of increasing speed, the air mass inside the car moves in the direction opposite to the car's acceleration...
C.; Durst, Paul A. P.; Pfennig, David W. (October 2016). "Behavioral Plasticity and the Origins of Novelty: The Evolution of the Rattlesnake Rattle"....
flexible and can vary with a number of different environmental factors. This plasticity can, arguably, be the strongest evolutionary advantage among organisms...
Heritage Endangered Program. mass.gov Allf, Bradley C.; Durst, Paul A. P.; Pfennig, David W. (July 28, 2016). "Behavioral Plasticity and the Origins of Novelty:...
rates for the sites are severely hampered. Hence, greater transcriptome plasticity has come at the cost of slower genome evolution. The octopus genome is...
various classifications of landslides. Broad definitions include forms of mass movement that narrower definitions exclude. For example, the McGraw-Hill...
structural ceramic whose utility derived largely from its rheological plasticity in the paste state. The setting and hardening of hydraulic cements derived...
purpose is not to remove material, but rather it employs the mechanism of plasticity to achieve its goal, with each particle functioning as a ball-peen hammer...
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