INCREASED DOLOS STRENGTH BY SHAPE MODIFICATION

S.A. Luger, D.T. Phelp, A. van Tonder, A.H. Holtzhausen

Abstract


A survey of prototype dolos breakages was performed to determine the distribution of failure modes. The results showed that 89% of the failures originate near the fluke-shank intersection. A series of static and dynamic finite element analyses was subsequently performed with the aim of improving the resistance of the dolos against the most commonly observed modes of failure. Of the six dolos shapes analysed, a large fillet extending from the fluke to the centre of the shank was found to be the most effective in reducing the stress in the critical fluke-shank intersection. Compared to a sharp intersection, the large fillet reduces the stress by more than 60%.

Keywords


dolos; dolos strength; dolos shape

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