621 球-平板接触下における表面き裂の応力拡大係数評価

概要

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A new method to evaluate the mode I stress intensity factor for a semi-circular surface crack subjected to a three-dimensional complicated stress distribution under ball-on-plate contact loading was proposed. Fabrikant & Hanson's equation, which was originally derived to evaluate the stress intensity factor of a penny-shaped subsurface crack, was applied for this problem, and the obtained value was compared with the three-dimensional finite element analysis result. The ratio of them was almost constant irrespective of the applied load and the crack radius. Multiplying the ratio as the correction factor of a surface effect in the value obtained from the method using Fabrikant & Hanson' equation, the stress intensity factor for a semi-circular surface crack under ball-on-plate contact loading could be evaluated conveniently.