Periodic Overload And Transport Spectrum Fatigue Crack Growth Tests Of Ti2222sta And A12024t3 Sheet

Author : E. P. Phillips
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (451 download)

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Download or read book Periodic Overload and Transport Spectrum Fatigue Crack Growth Tests of Ti2222STA and A12024T3 Sheet written by E. P. Phillips and published by . This book was released on 1999 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Variable amplitude loading crack growth tests have been conducted to provide data that can be used to evaluate crack growth prediction codes. Tests with periodic overloads or overloads followed by underloads were conducted on titanium alloy Ti-6Al-2Sn-2Zr-2Mo-2Cr solution treated and aged (Ti62222STA) material at room temperature and at 350 deg. F. Spectrum fatigue crack growth tests were conducted on two materials (Ti62222STA and aluminum alloy 2024-T3) using two transport lower-wing test spectra at two temperatures (room temperature and 350 deg. F (Ti only)). Test lives (growth from an initial crack half-length of 0.15 in. to failure) were recorded in all of the tests and the crack length against cycles (or flights) data were recorded in many of the tests. The following observations were made regarding the test results: (1) in tests of Ti62222STA material, the tests at 350 deg. F had longer lives than those at room temperature, (2) in tests to the MiniTwist spectrum, the Al2024T3 material showed much greater crack growth retardations due to the highest stresses in the spectrum than did the Ti62222STA material, and (3) comparisons of material crack growth performances on an "equal weight" basis were spectrum dependent.