Abstract
Direct integration of the empirical relation between crack velocity and stress intensity factor results in the expression describing time variation of crack length in the subcritical region. With appropriate normalization, it is possible to plot crack length vs time. This is done for two types of loading: constant stress and constant stress rate. These plots show that crack growth in a given material, and at a specified stress or stress rate, is extremely slow during bulk of the life time and increases exponentially as failure time or failure stress are approached. Beyond the subcritical region, crack growth is extremely rapid and not of practical interest. The relationships between threshold stress/time, critical stress/time and stress corrosion constant for the two types of loading are discussed. By way of an application, crack growth during dynamic fatigue and its effect on strength loss are calculated for the case of tensile loading of glass fibers are verified experimentally.
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