4018 Method for Quantitative Evaluation of Dimple Fracture Surface using Run Length

Fractography is the essential method for failure analysis. Diameter, depth and direction of dimples observed on ductile fracture surface is related deeply to the ductility and the crack propagation direction. In this paper, we propose one of numerical methods for fractography to characterize dimple's diameter. Long Run Emphasis (LRE) which is the statistic value of texture analysis and relates directly to the diameter of dimple, is calculated. The method is applied to the fracture surfaces of Titanium alloy which were formed by the high-temperature tensile test. In the result, the relationship between the temperature and LRE was obtained. Therefore, we could estimate the temperature from the dimple by the method.