球-平板接触下における半円形微小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 micro 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 result of the three-dimensional finite element analysis. For the crack which radius was less than 10μm, the ratio of them was almost constant irrespective of the applied load, the crack radius and the distance from the contact point to the crack. Multiplying the ratio as the correction factor in the value obtained from the method using Fabrikant & Hanson' equation, the stress intensity factor for a semi-circular micro surface crack under balloon-plate contact loading could be evaluated conveniently.
2005-02-25