THE PROPAGATION OF NON-COPLANAR SEMI-ELLIPTICAL FATIGUE CRACKS |
| |
| Authors: | W. O. Soboyejo,&dagger J. F. Knott,&Dagger |
| |
| Affiliation: | Department of Materials Science and Metallurgy, Cambridge University, Pembroke Street, Cambridge CB2 3QZ, England |
| |
| Abstract: | Abstract— The results of fatigue tests on specimens containing parallel offset and parallel collinear configurations of multiple non-coplanar cracks are presented. The fatigue growth of parallel collinear cracks is shown to be significantly affected by crack-tip shielding and parallel offset cracks are shown to grow almost independently before their adjacent tips overlap. Subsequent growth in the region of overlap results in coalescence which begins when the deviating crack tips come into contact below the surfaces of the specimens. Simplified predictions of the propagation of offset non-coplanar semi-elliptical cracks are also presented and their implications for the prediction of fatigue lives in structures containing offset coplanar cracks are assessed. |
| |
| Keywords: | |
|
|
