Effects of Features of Graphite Nodules on Stress Concentration in Nodular Graphite Cast Iron Material under Multi-Axial Loading
Résumé
This research is concerned with the determining of best configuration features of graphite nodules, (spherical or elliptical in shape), embedded in cast iron matrix, that contribute in reducing the stress concentration. Experimental and numerical studies were carried out to satisfy the aims. Results show that the plane of stress concentration and thusly the critical planes of cracking and propagation are perpendicular to the loading axis. X-Ray tomography demonstrated that cracks appear to take the path of high-density nodules. The stress concentration increments as the nodule size increments, yet this tendency is clearer when the size is smallest. The effect of the intensity of applied stress on the came about stress concentration is profoundly noticed in the case of large size nodules. The stress concentration increases rapidly as the inter-distance displays little values. The stress concentration decreases as the dimension ratio of the elliptical nodule increases. It has minimum value when the ellipse long dimension is aligned with the axis of applied stress. However, it is maximum when the orientation angle is about 90°.
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