Fluid injection in deep geological formations usually induces microseismicity. In particular, industrial-scale injection of CO2 may induce a large number of microseismic events. Since CO2 is likely to reach the storage formation at a lower temperature than that corresponding to the geothermal gradient, both overpressure and cooling decrease the effective stresses and may induce microseismicity....

Osmium, the least compressible metal, has recently been observed to undergo abrupt changes in c/a ratio at extreme pressures. These are claimed provide evidence for two unusual electronic behaviors: a crossing of semicore 4f and 5p levels, an topological transition. We demonstrate that these phenomena readily reproduced understood density functional theory, but neither perturbs trend against pr...

Creep refers to the deformation of rock with time under long-term applied stress, which occurs in most underground engineering. The creep behavior granite Shuangjiangkou powerhouse Western Sichuan Province, China, was studied by tests. Based on test results, a new parameter DPR, ratio deviatoric stress peak strength, is proposed. DPR found be key describe parameters such as instantaneous elasti...

We present here an extension of the viscoplastic self-consistent (VPSC) polycrystal model for the calculation of the intergranular Cauchy stresses in an aggregate. This method, which is based on the self-consistent treatment of incompressible aggregates proposed in 1987 by Molinari et al, is formulated using the inclusion formalism and full anisotropy is incorporated into it. The complete stres...

Steady state axisymmetric deformations of an elastic perfectly plastic target being penetrated by a fast moving rigid cylindrical rod have been analyzed by the finite element method. The target is assumed to obey the yon Mises yield criterion and the associated flow rule. Contact between target and penetrator has been assumed to be smooth. A mixed formulation, in which two components of the vel...

Dynamic powder compaction is analyzed using the assumption that the powder behaves, while it is being compacted, like a hydrodynamic fluid in which deviatoric stress and heat conduction effects can be ignored throughout the process. This enables techniques of computational fluid dynamics such the equilibrium flux method to be used as a modeling tool. The equation of state of the powder under co...

An advanced Ginzburg-Landau (GL) approach to melting and solidification coupled with mechanics is developed. It is based on the concept of a coherent solid-liquid interface with a transformation strain tensor, the deviatoric part of which is described by a thermodynamically consistent kinetic equation. Due to the relaxation of the elastic energy, a promoting contribution to the driving force fo...