This paper is an attempt to formulate an estimation method which can efficiently determine the critical plane according to the criteria under consideration. It is required to maintain greater accuracy than the incremental angle methods used conventionally in critical plane searching algorithms. The multi-criteria-based critical plane selection method is evaluated; the considered criteria include a fatigue parameter and variance ofudshear stress, both maximized to find the most damaging plane. The results show that the proposed model reduces the number of iterations by 90% with greater accuracy than theudconventional methods and multiple candidate planes can easily be identified. Two or more criteria can easily be implemented in searching for the critical plane. The GAbasedudcritical plane location method shows promise for fatigue life estimation as it is flexible and simple to implement.
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