HYDROTESTING EFFECTS-1 MODEL PREDICTS CRACK GROWTH AND MATERIAL BEHAVIOR

B. N. Leis, F. W. Brust Battelle Columbus Division Columbus, Ohio The crack-driving force in line-pipe steel material can be expected to increase as a consequence of cyclic load and hold-time effects. These effects are especially evident during hydrotesting. In addition, repeated hydrotesting can cause cracks to grow at pressures less than achieved in a prior test.

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