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The effect of dents on fatigue life and fatigue crack growth of aluminum 2024-T3 bare sheet [electronic resource] /

by Shivalli, Praveen.; Smith, Bert. advisor

Abstract (Summary)
[Author abstract shortened by cataloger] The purpose of this study is to determine the effect of dents on the fatigue properties of 0.04 inch thick 2024-T3 bare aluminum sheet, which is the most widely used material for aircraft skin. The study is divided into two parts. The first part (Part I) is a study on the effect of dents on the fatigue life of the material, while the second part (Part II) is a study on the effect of dents on crack growth in the material. The test specimens were either pristine (no dents), dented or reworked. For Part I, the dented and reworked specimens were divided into two groups, depending on the dent depth ranges. The dent depths for each of these two groups ranged from 0.030" to 0.0335" and 0.0605" to 0.065". Dents were produced with a drop tower having a 0.5 inch spherical hardened steel indenter head. The fatigue life of the material in these three conditions was determined experimentally. Constant amplitude fatigue tests were conducted according to ASTM-466 with a single stress level and a single frequency for the fatigue cycle. The results were then compared to determine the effect of dents and the reworking of dents on the fatigue life of the material. Results of the study indicate that the fatigue life of a dented specimen is significantly less than that of the pristine and the reworked specimens. The study also showed that the fatigue life decreases as the dent depth increases in the dented specimens.
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School:Wichita State University

School Location:USA - Kansas

Source Type:Master's Thesis

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