Abstract
A new classification of fracture surfaces based on the modified degree of orientation is presented. The proposed classification system is more accurate and allows a better choice of parameters for further analysis. In particular it covers fracture surfaces with overlaps and secondary cracks. As secondary cracks have hardly been considered in the existing studies, the main features such as main and secondary cracks and overlaps are precisely defined. To quantity them a method of dividing the fracture profile into the main profile and secondary cracks is developed and described. New parameters such as the mean secondary crack length and density of secondary cracks are defined and their estimators are given. The problem of real fracture surface area is discussed with respect to the classification introduced. Corrected boundary values for the relations between linear and surface roughnesses are derived and various relations for evaluation of the real fracture surface area are discussed. Two simple parameters for quantifying particles observed in fracture surfaces are defined and their possible application is briefly discussed.
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