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Book The Effect of Dents on Fatigue Life and Fatigue Crack Growth of Aluminum 2024 T3 Bare Sheet

Download or read book The Effect of Dents on Fatigue Life and Fatigue Crack Growth of Aluminum 2024 T3 Bare Sheet written by Praveen Shivalli and published by . This book was released on 2006 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: For Part II, the specimens are again either pristine dented or reworked. The edge-cracked pin-loaded specimens of 8" in width were tested at constant amplitude loading with a stress ratio of 0.2 producing stable crack growth of close to 4 inches completely through two dents on the crack line. Dents were produced the same as described for Part I. Dent depths ranged from 0.03" to 0.0325" measured on the convex side of the specimen. A starter notch of 0.3" was produced at the edge of the specimen with a jeweler's saw blade. The specimen was fatigue loaded under constant amplitude loading to produce an initial crack length of 0.37" t which time readings of crack length vs. cycles began. The same constant amplitude cyclic loading used to produce the initial crack length was used during the testing. The crack lengths were measured with an optical microscope at 160X magnification. Nine specimens were tested including three replications for each of the three conditions. Crack growth data is given in both tabular and graphical form for all specimens. Crack growth rate data is also presented in graphical form. The overall crack growth in the dented specimens was significantly greater than in the pristine specimens. It was also, on the average, faster in the reworked specimens however, reworking, in general, did not recapture the life displayed by the pristine specimens.

Book High Cycle Fatigue of Structural Materials

Download or read book High Cycle Fatigue of Structural Materials written by W. O. Soboyejo and published by Minerals, Metals, & Materials Society. This book was released on 1997 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: Examining underlying mechanisms governing the high-cycle fatigue behavior of structural materials, this book from Materials Week '97 focuses on the high-cycle fatigue behavior of existing aluminum, nickel, and titanium-base alloys. Mechanical and empirical approaches to the assessment of environment and temperature effects are examined, along with probable approaches for the prediction of high-cycle fatigue behavior under both uniaxial and multiaxial stresses.

Book Journal of the Mechanical Behavior of Materials

Download or read book Journal of the Mechanical Behavior of Materials written by and published by . This book was released on 1997 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Overload and Underload Effects on the Fatigue Crack Growth Behavior of the 2024 T3 Aluminum Alloy

Download or read book Overload and Underload Effects on the Fatigue Crack Growth Behavior of the 2024 T3 Aluminum Alloy written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth tests were conducted on 0.09 inch thick, 3.0 inch wide middle-crack tension specimens cut from sheets of 2024-T3 aluminum alloy. The tests were conducted using a load sequence that consisted of a single block of 2,500 cycles of constant amplitude loading followed by an overload/underload combination. The largest fatigue crack growth life occurred for the tests with the overload stress equal to 2 times the constant amplitude stress and the underload stress equal to the constant amplitude minimum stress. For the tests with compressive underloads, the fatigue crack growth life decreased with increasing compressive underload stress. Dawicke, David S. Langley Research Center NASA-CR-201668, NAS 1.26:201668 NAS1-96014; RTOP 538-02-10-01...

Book Effect of Environment on Fatigue Crack Propagation in 2024 T3 Aluminum Alloy

Download or read book Effect of Environment on Fatigue Crack Propagation in 2024 T3 Aluminum Alloy written by David Michael Lovell and published by . This book was released on 1968 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Effects of Shot and Laser Peening on Fatigue Life and Crack Growth in 2024 Aluminum Alloy and 4340 Steel

Download or read book The Effects of Shot and Laser Peening on Fatigue Life and Crack Growth in 2024 Aluminum Alloy and 4340 Steel written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-03 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue and crack growth tests have been conducted on 4340 steel and 2024-T3 aluminum alloy, respectively, to assess the effects of shot peening on fatigue life and the effects of shot and laser peening on crack growth. Two current programs involving fixed and rotary-wing aircraft will not be using shot peened structures. Since the shot peening compressive residual stress depth is usually less than the 0.05-inch initial damage tolerance crack size, it is believed by some that shot peening should have no beneficial effects toward retarding crack growth. In this study cracks were initiated from an electronic-discharged machining flaw which was cycled to produce a fatigue crack of approximately 0.05-inches in length and then the specimens were peened. Test results showed that after peening the crack growth rates were noticeably slower when the cracks were fairly short for both the shot and laser peened specimens resulting in a crack growth life that was a factor of 2 to 4 times greater than the results of the average unpeened test. Once the cracks reached a length of approximately 0.1-inches the growth rates were about the same for the peened and unpeened specimens. Fatigue tests on 4340 steel showed that the endurance limit of a test specimen with a 0.002-inch-deep machining-like scratch was reduced by approximately 40 percent. However, if the "scratched" specimen was shot peened after inserting the scratch, the fatigue life returned to almost 100 percent of the unflawed specimens original fatigue life. Everett, R. A., Jr. and Matthews, W. T. and Prabhakaran, R. and Newman, J. C., Jr. and Dubberly, M. J. Langley Research Center NASA/TM-2001-210843, NAS 1.15:210843, ARL-TR-2363, L-18065

Book Effects of Surface Generated Scratches on the Fatigue Life of A1 2024 T3

Download or read book Effects of Surface Generated Scratches on the Fatigue Life of A1 2024 T3 written by Anwer Arif Zaidi and published by . This book was released on 1993 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fatigue Crack Growth Behavior of Friction Stir Welded 2024 T3 Aluminum Alloy Tested Under Accelerated Salt Fog Exposure

Download or read book Fatigue Crack Growth Behavior of Friction Stir Welded 2024 T3 Aluminum Alloy Tested Under Accelerated Salt Fog Exposure written by M. Milan and published by . This book was released on 2014 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue crack growth properties of friction stir welded joints of 2024-T3 aluminum alloy were studied via constant amplitude load (increasing ?K) testing under open air and accelerated salt fog exposure conditions. For low ?K values, longitudinal crack growth in the weld line center was slower under corrosion fatigue than by air because of the prevalence of corrosion-induced crack closure. On the other hand, growth rates of transverse crack crossing the weld nugget were not affected by the environment aggressiveness because of a balance between hydrogen embrittlement and corrosion inducing crack closure along with welding compressive residual stresses. For intermediate ?K values, propagation rates 5 times faster were observed for both longitudinal and transverse cracks under salt fog ambient as a result of hydrogen-induced embrittlement, which is favored by larger crack tip openings allowing local corrosive medium access. As the final catastrophic fracture approaches, longitudinal and transversal crack propagation rates under corrosion fatigue approximated the values observed in air testing, as time, under the 30-Hz loading frequency applied, was scarce for an effective interaction between crack tip fresh material and the hostile environment. For longitudinal cracks, precracking in air resulted in fatigue-corrosion limit factor ?Kth slightly lower than that obtained in salt fog precracked specimens, as the corrosive role played by the salt fog environment along the precrack introduction contributed to crack-closure effect, so increasing the apparent value of ?Kth. On the other hand, the environment in which a transverse precrack was created had a negligible effect on ?Kth because of the establishment of an equilibrium condition between corrosion-induced precrack closure and hydrogen embrittlement.

Book Effects of Anodizing and Cladding on Fatigue Lives of Aluminum 2024 T3 and 7075 T6 Alloys

Download or read book Effects of Anodizing and Cladding on Fatigue Lives of Aluminum 2024 T3 and 7075 T6 Alloys written by Selvakumar Karunakaran and published by . This book was released on 2005 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Advances in Fatigue Life Prediction Methodology for Metallic Materials

Download or read book Advances in Fatigue Life Prediction Methodology for Metallic Materials written by and published by . This book was released on 1992 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: