The creep anisotropy of nickel-base superalloys with a cubic y' morphology is studied with a composite model. Creep curves and the internal stress distribution in the microstructure under [Oll] load are calculated with a Finite Element Procedure. Analytical considerations are made for arbitrary loading directions. y' cubes (with their interfaces aligned parallel to (001) planes) under [OOl] loa...

The blast loading direction and in-situ stress field have an effect on the destruction process in surrounding rock around tunnel. Five blasting directions are considered experiment simulation. static distribution by confining pressure superposition waves discussed simulation LS-DYNA. Results indicated that hoop accelerates radial cracks growing, damage hole is not influenced direction. wave fai...

An approximate analysis is presented together with a physicaf description of the modes of propagation in stripline and microstrip devices of significant width, using ferrite slabs as dielectric material, magnetized perpendicular to the ground plane. The dominant mode resembles TEM propagation, except that there is a strong transverse field displacement, causing wave energy to be concentrated al...

Authors have been conducting research on an autonomous system for loading operation by wheel loader. In loading operation with V shape loading method, a time for travelling is the dominant factor for the cycle time. The path should be modified varied condition of the working place. To achieve quicker and reliable operation in autonomous loading operation, new path planning method is developed. ...

nowadays acoustic emission (ae) testing based on the kaiser effect (ke) is increasingly used to estimate the in-situ stress in laboratories. in this work, this effect is assessed on cylindrical specimens in numerical simulations of the cyclic loadings including loading, unloading, and re-loading cycles using a 3d code called the particle flow code (pfc) based upon the distinct element method. t...

Extensive research has been focused on the progressive collapse analysis of buildings and most of them are based on the alternative path method (APM) with sudden removal of one or several columns. However, in this method the damage of adjacent elements of removed columns under blast conditions was ignored and this issue can lead to an incorrect prediction of progressive collapse. Therefore, in ...

an energy based damage index based on a new nonlinear finite element (fe) approach applicable to rc structures subjected to cyclic, earthquake or monotonic loading is proposed. the proposed method is based on the evaluation of nonlinear local degradation of materials and taking into account of the pseudo-plastic hinge produced in the critical sections of the structure. a computer program is dev...

construction of asphaltic core dams is a relatively novel method especially in iran. iran is located in a region with high seismicity risk. therefore, many researchers have focused on the behavior of such types of dams under earthquake loading. in this research, the behavior of asphaltic core rockfill dams (acrd) has been studied under earthquake loading using nonlinear dynamic analysis method ...

Cryptosporidium oocysts were concentrated by an ether-phosphate-buffered saline sedimentation technique and then separated by density gradient centrifugation. This two-step method yielded highly concentrated oocysts largely free of bacteria and fecal debris.