Abstract
So far two types of crack extension have been considered: stable crack extension starting at K 1 =K 10 and unstable crack extension, if K 1=K 1inst is reached (or at K 1 =K 1c for a material with a flat crack growth resistance curve). A third type of crack extension is called subcritical crack extension. This is a time-dependent phenomenon, where a crack is growing at constant load below K 1 =K 1inst. In this section the subcritical crack extension below the high temperature regime is considered. The creep crack growth is described in Sect. 12.2. The subcritical crack extension under cyclic loading is dealt with in Chap. 6.
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