Prediction of plasticity characteristics for three-dimensional fracture specimens comparison with experiment
✍ Scribed by E.T. Moyer jr.; P.K. Poulose; H. Liebowitz
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 922 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
A center-cracked pa&l of 707Saluminum alloy which has over-aged from the T651 condition was loaded in tension and subsequently unloaded to zero applied load. The permanent surface deformation was measured close to the intersections of the crack front with the free surfaces. The permanent deformation (being a good indicator of the extent of plastic deformation) was used to measure the accuracy of finite element analyses. The same specimen was modeled using 20node three-dimensional isoparametric elements. A fully incremental elastic-plastic formulation was employed in the stress analysis. The residual surface deformations after unloading were compared to the experimental results. The average experimental results compared quite favorably with the finite element predictions.
The average results were employed to minimize the influence of material inhomogeneity, load misalignment and lack of symmetry in the fatigue crack. The scatter in the results from measuring the different sides is discussed.