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According to the characteristic of moisture expansion in porous media, action mechanism and influencing factors of moisture stress in building walls were analyzed and moisture expansion experiments were carried on commonly used porous media such as tiles and cement mortar. The results and analysis of the experiments indicate that: The moisture content and gradient inside the wall are affected by thermal...
Introducing a soft region concept depicting the initiating damage of concrete, soft regions are distributed in matrix. Assuming concrete as two-phase composites including matrix and soft regions, considering material heterogeneity, matrix and soft regions' number obey WEIBULL distribution in terms of element failure strength. Changing shear transfer coefficient for an open crack, soft regions volume...
The studying team prepared stress-absorbing material interlayer (SAMI) modified asphalt mixture by the best use of local conditions to test its actual modulus of elasticity, Combining with actual local conditions, Studying team ultimately determine the SAMI practical elastic modulus, which was applied to ANSYS finite element method (FEM) software to calculate the different stress effect of the SAMI...
The bending effect of a piezoelectric quartz beam under uniformly distributed load is studied. First according to the anisotropic elasticity, the differential equation in the form of plane stress function is obtained, and then the bending stress components are calculated. By the piezoelectric equation the polarization is obtained. By means of the electrostatic theory in the presence of matter the...
The stresses in rails under wheel loads have a strong bearing on the safety of railway transportation. A prediction of stresses in rails is of interest to both manufacturers and operators. In the past, several models have been developed for the problem. However, due to the complexity of the problem, there is still no ??standard model?? available. The issue addressed in this paper is how to design...
One problem when modelling soil compaction is the estimation of vertical stress distribution at the soil surface, as it is non-uniform and mainly depends on soil properties. However, a uniform vertical stress distribution is used in most FEM compaction models. A new processing approach is proposed to numerically model vertical stress distribution at the soil surface, employing the FEM models of PLAXIS...
The nature reason and the decisive factors of the spring back in bending process are studied in this paper. The analysis shows that opposite stress directions in the inner and outer fibers of the sheet material in the bending deformation region essentially contribute to the spring back, and controlling the bending moment created by this different stress directions is the essential method to control...
The pull-in problem of fixed-fixed beam structures cannot be solved analytically due to its nonlinear from the large deflection and the electrostatic driving force. So to understanding the characters of the devices, the designers have to resort to numerical techniques. Lack of an accurate model for predicting pull-in voltage for basic micromachined beam structures necessitates the clear need for a...
The problem of bending of a plate with an elliptical rigid inclusion loaded by remote uniformly distributed stresses is considered. The solution of the problem is reduced to finding two analytical functions /spl phi//sub v/(Z/sub v/) of the generalized complex coordinates Z/sub v/ = x + /spl mu//sub v/y. The functions /spl phi//sub v/(Z/sub v/ ) are determined by conformal mapping of the exterior...
The geometrical and compliance mismatch between host artery and synthetic vascular substitute creates an increase of pulse wave reflection and energy losses as well as a stress concentration at the anastomosis. It may cause structural fatigue of the arterial wall leading to eventual rupture. A method is proposed for the theoretical computation of stresses at the arterial/graft junction. The theory...
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