In this study, the structural performance of the joint construction method using aluminum sprayed plate in concrete was evaluated, and the corrosion characteristics of the aluminum sprayed film in mortar was also evaluated. The corrosion rate of the aluminum sprayed plate in mortar was high in the early stage after mortar placing, but it decreased with the passage of the embedding period. This was due to the corrosion products deposited on the surface of the aluminum, which was presumably due to the suppression of especially anodic reactions. In the structural performance evaluation, we found that embedding in concrete reduced the slip strength relative to the specimen with no embedding, regardless of the period in concrete. However, there was no effect of the embedding period, and the slip strength was not continuously reduced. Furthermore, the slip strength was higher than that of the conventional blasting method for all embedding periods.
In the crash of automobiles, main behavior is bending deformation. Because of this, it is important to accuracy of calculate edge stress and allowable stress on surface of structure. For that purpose, it is necessary to consider the distribution of the fiber orientation angle and degree in the plate thickness direction. In a general coupled analysis for injection molding materials, a material model is created based on the physical properties obtained from an arbitrary test piece. Therefore, even if the orientation angle in each part to be analyzed is taken into consideration, the degree of orientation is constant in each part, and the degree of orientation distribution in the plate thickness direction is also treated as constant. We tried to improve the accuracy of crash analysis by calculating the edge stress and allowable stress with high accuracy by considering the distribution of orientation angle and degree in the plate thickness direction. For that purpose, we created a model that calculating properties of composite materials from resin and fiber properties, and the process that mapping the distribution of orientation angle and degree in the plate thickness direction to each integration point of the shell element on structural analysis from molding analysis.
Transformation plasticity is known to play an important role during heat treatment processes of steels. It has been considered that the distortion during heating is less significant than that during cooling and thus the heating process was often neglected in the heat treatment simulations such as quenching. The recent study, however, revealed the significance of heating process to the final shape and dimension of the heat treating materials. This study thereby aims at identifying transformation plasticity during heating of a bearing steel (SUJ2 in Japanese industrial standard). The major difficulty when measuring transformation plasticity during heating is to eliminate the creep effect from the obtained dilatation curves. A temperature dependent creep equation is defined and each parameter appear in the equation was identified from the dilatation curves. In this way, transformation plastic strain can be separated from the creep effect. The obtained transformation plasticity coefficient of SUJ2 during heating was well identified to be 1.38×10-4 MPa-1 which appears to be much larger from what is estimated by Leblond’s mathematical model.