Papers by Keyword: Stress-Strain Characteristics

Abstract: In this paper, roads analysis software bisar 3.0 be used to build an elastic layered system analysis model for cement stabilized macadam base. Different construction methods and structures contact conditions between the layers were comprehensive considered based on the actual pavement structure, in order to analyze the internal stress-strain state of cement stabilized macadam. The results show that interlayer contact conditions is approximately smooth state when cement stabilized macadam base used the traditional two layered construction method, which may occur structural damage between cement stabilized macadam base caused by partial stress concentration. However, the interlayer contact conditions is approximately completely continuous state when used the overall construction methods, and the stress-strain state of cement stabilized macadam can significantly improve by changing interlayer contact conditions. Finally, by changing the construction methods for to change interlayer contact conditions, the stress-strain state of cement stabilized macadam can be effectively improved, and the road performance and service life also be significantly improved.

Abstract: Single crystals of technical purity Magnesium (99.8 wt.%) of initial orientations [ ] 2 1 10 and [ ] 2 2 11 were subjected to HPT deformation at room temperature up to strains of 10. The microstructural evolution has been analyzed by X-ray microtexture investigations and by in-situ stress-strain measurements. The results can be described in terms of shear arising from HPT deformation and - with higher strains - in terms of recrystallization. In crystals with hard orientation[ ] 2 2 11 , these features occur at smaller strains than in crystals with soft orientation [ ] 2 1 10 , i.e. with higher symmetry. In general, the observed textures and strength variations are much stronger than those reported for fcc HPT deformed metals.

Abstract: With the aid of an ASC-type finishing line (Automatic System Control) and continuous cooling of the rolled stock in water boxes, modern continuous light mills enable thermomechanical (controlled) rolling of SBQ-type rods (Special Bar Quality). During the thermomechanical forming (at different temperatures or cooling rates etc.), one can analyze the quality parameters of roundsection steel bars. In order to obtain better understanding to the forming conditions (temperature, strain and strain rate) and the possibility of cooling (related to its rate and time), an experiment involving continuous and discontinuous testing by means of a Gleeble plastometer was suggested. After its implementation, the attention was focused on the mathematical interpretation of the stressstrain characteristics of the steel and on metallographic observation of microstructural changes. The results achieved are of universal meaning and contribute to the theoretical understanding of controlled forming.