Abstract
Studies of crack growth under equi-biaxial fatigue which is caused by thermal stress have been conducted and show that crack growth rate under equi-biaxial stress is faster than under uniaxial one. This study focuses on the difference of crack growth rate between equi-biaxial and uniaxial and compared them quantitatively based on fatigue life and crack growth rate. Then the mechanism of occurrence of different crack growth rate between them is examined. The acceleration of crack growth rate under equi-biaxial stress is estimated as the main reason to decrease fatigue life.
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