Accession Number:

ADA156425

Title:

Prediction of Plasticity Characteristics for Three-Dimensional Fracture Specimens Comparison with Experiment,

Descriptive Note:

Corporate Author:

GEORGE WASHINGTON UNIV WASHINGTON DC SCHOOL OF ENGINEERING AND APPLIED SCIENCE

Report Date:

1985-01-01

Pagination or Media Count:

40.0

Abstract:

A center-cracked panel of 7075-Aluminum alloy which has overaged 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 20-node 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 compare 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. Author

Subject Categories:

  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE