Mechanistic approach to multiphase porous media modeling with application of new stress principle (original) (raw)
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Journal of Structural and Construction Engineering (Transactions of AIJ)
The aim for this study is to clarify the shear stress transfer mechanism on the concrete crack surface. In the previous paper, it was confirmed that the stress softening was occurred on local crack surface by the authors experiments. However, the shear stress transfer models considering this phenomenon haven't been constructed. Therefore, it is needed to be proposed such a shear transfer model, and authors tried to do it. The proposal model is based on the contact theory in two-dimension. Moreover this model and other previous models are compared with the experimental curves in order to be verification of the models adaptation. In this paper, the formulations of the proposal model and results of comparing are presented. As the result, it is concluded that the proposal model can fit authors experimental results much better than any other previous models.
Journal of the Society of Materials Science, Japan, 2006
In order to understand the initiation behavior of microstructurally small cracks in a stress corrosion cracking condition, it is important to know the tensile normal stress acting on the grain boundary (normal G. B. stress). The local stress in a polycrystalline body is greatly influenced by deformation constraint which is caused by anisotropic and/or inhomogeneous property of each grain. In present study, the local normal G. B. stress on bi-and tri-crystal bodies and a three-dimensional polycrystalline body consisting of 100 grains were evaluated by the finite element method under a remote uniform tensile stress condition. The polycrystalline body was generated by using a Monte Carlo procedure and random orientations were assigned to each grain. It was revealed that the local normal G. B. stress on the polycrystalline body is inhomogeneous under uniform applied stress. The stress tends to be large near the triple points due to the deformation constraint caused by adjacent grains, even though the grain boundary inclination to the load axis has large influence. It was also shown that particular high stress was not observed at corners of the polycrystalline body.
Journal of Structural and Construction Engineering (Transactions of AIJ)
When buildings undergo seismic retrofitting, reinforcing members are connected to existing members by roughening the concrete surfaces and installing new anchors. In the Japanese guidelines pertaining to the seismic retrofitting of structures, no standards are provided for concrete roughening. Therefore, we conducted shear loading tests and measurements of the roughened surfaces were taken. Then, mechanical models of the roughened concrete surfaces were developed based on a constitutive law for cracked concrete surfaces. Using the results, a model is proposed from which shear stress-shear displacement relations as well as normal stress-shear displacement relations can be reasonably estimated.
Journal of the Japan Society for Technology of Plasticity, 2014
Combining the Sachs deformation model with the dislocation theory, we can predict the stress-strain curve for both face centered cubic (FCC) and body centered cubic (BCC) single crystals generally. Residual dislocation densities are estimated from total amount of microscopic slip, considering cross-slipped dislocations and sessile dislocations. Stresses are calculated from estimated dislocation densities using the Bailey-Hirsch relationship. Finally, we showed a calculation example of the Sachs deformation model to explain low-angle boundary formation.