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A new constraint based fracture criterion for surface cracks |
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| Authors: | A.M. Leach J.C. Newman Jr. |
| Affiliation: | a Department of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, N.W., Atlanta, GA 30332, USA b Department of Mechanical Engineering, Mississippi State University, 210 Carpenter Building, Mississippi State, MS 39762, USA c Department of Aerospace Engineering, Mississippi State University, 330 Walker Engineering Laboratory, Hardy Street, Mississippi State, MS 39762, USA |
| Abstract: | A new methodology for predicting the location of maximum crack extension along a surface crack front in ductile materials is presented. Three-dimensional elastic-plastic finite element analyses were used to determine the variations of a constraint parameter (αh) based on the average opening stress in the crack tip plastic zone and the J-integral distributions along the crack front for many surface crack configurations. Monotonic tension and bending loads are considered. The crack front constraint parameter is combined with the J-integral to characterize fracture, the critical fracture location being the location for which the product Jαh is a maximum. The criterion is verified with test results from surface cracked specimens. |
| Keywords: | Surface Crack Constraint FEA |
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