Download or read book A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys 1 Spectrum Simplification written by Jack Telesman and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Spectrum Fatigue Crack Propagation in Two Aluminum Alloys 2 Influence of Microstructures written by Jack Telesman and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1988 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Fatigue Crack Growth Resistance of Aluminum Alloys Under Spectrum Loading written by G. V. Scarich and published by . This book was released on 1983 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this program is to obtain metallurgical guidelines and test methodologies for selection and development of spectrum fatigue resistant, high strength aluminum alloys for application to aircraft structures. Described in this report are the results of baseline characterizations of ten high strength aluminum alloys. Also described are results of fatigue crack-growth tests under two F-18 load spectra and under modifications of these spectra.

Download or read book The Rate of Fatigue crack Propagation for Two Aluminum Alloys Under Completely Reversed Loading written by Walter Illg and published by . This book was released on 1959 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Changing Stress Amplitude on the Rate of Fatigue crack Propagation in Two Aluminum Alloys written by C. M. Hudson and published by . This book was released on 1961 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of fatigue tests with specimens subjected to constant amplitude and two-step axial loads were conducted on 12-inch-wide sheet specimens of 2024-T3 and 7075-T6 aluminum alloy to study the effects of a change in stress level on fatigue-crack propagation. Comparison of the results of the tests in which the specimens were tested at first a high and then a low stress level with those of the constant-stress-amplitude tests indicated that crack propagation was generally delayed after the transition to the lower stress level. In the tests in which the specimens were tested at first a low and then a high stress level, crack propagation continued at the expected rate after the change in stress levels.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1971 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Load Spectrum Variables on Fatigue Crack Initiation and Propagation written by D. F. Bryan and published by ASTM International. This book was released on 1980 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engine Structures written by and published by . This book was released on 1988 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Methodology for Evaluation of Fatigue Crack Growth Resistance of Aluminum Alloys Under Spectrum Loading written by G. R. Chanani and published by . This book was released on 1982 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this program is to obtain guidelines and test methodologies for selection and development of spectrum resistant, higher strength aluminum alloys for application to aircraft structures. The results described in this report present baseline characteristics of a number of high strength aluminum alloys for use in the future phases of this investigation. Seven commercial 2XXX and 7XXX aluminum alloys were chosen and have been characterized with respect to chemical composition, microstructure, tensile properties and fracture toughness. Fatigue crack propagation (FCP) tests were conducted on specimens of each alloy for both constant-amplitude loading (including the near-threshold region) and two F-18k load spectra. One of the spectra was dominated by tension loads and the other contained tension and compression loads of nearly equal magnitude. The spectrum FCP testing was performed at maximum peak stress of 145 MPa (21 ksi) as well as limited testing at 103 and 169 MPa (15 and 24.5 ksi) to obtain additional data at the low and high end of the crack-growth range. Pertinent fracture surface features were documented on the spectrum fatigue specimens.

Download or read book Spectrum Fatigue Crack Growth Rate Characteristics of Cast Aluminum Alloys A201 T7 and A357 T6 written by Jon D. Tirpak and published by . This book was released on 1986 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spectrum fatigue crack growth characteristics of cast aluminum alloys A201-T7 and A357-T6 were evaluated and compared with wrought aluminum 7050-T76 data. For specimens tested at three different spectrum stress levels, A357-T6 consistently possessed the longest fatigue life, nearly double that of A201-T7 and 7050-T76. At the lowest maximum spectrum stress level tested 7050-T76 had a greater fatigue crack growth life than 7050-T76; at the highest maximum stress level tested 7050-T76 had a greater FCG life than A201-T7. Critical crack size of each alloy at failure varied considerably. Further analysis of the a vs. N record of each sample to obtain the crack growth rate (FCGR) vs. the corresponding stress intensity indicated that A357-T6 had the lowest crack growth rate over the range of stress intensity examined. FCGR comparisons between A201-T7 anf 7050-T76 depended on the level of stress intensity. Macrofractography revealed that the alloys had distinctively different fracture topographies. Microfractography, using scanning electron microscopy, revealed little because compressive loads obliterated features typically associated with fatique.

Download or read book Development of Fatigue Loading Spectra written by John M. Potter and published by ASTM International. This book was released on 1989 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1604 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Crack Propagation in Aluminum Alloy Tension Panels written by Richard E. Whaley and published by . This book was released on 1960 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented of a series of fatigue tests to study crack propagation and the resulting stress distributions in tension panels. The panels were all of the same general design, and configurations varied mainly in the relative amount of cross-sectional area in the skin, stiffeners, and flanges. The panels were constructed of 2024-T3 and 7075-T6 aluminum alloys. It was found that the average rate of crack growth was slower in panels made of 2024-T3 aluminum alloy than in panels made of 7075-T6 aluminum alloy. All cracks initiated in the skin, and the slowest crack growth was measured in configurations where the highest percentage of cross-sectional area was in the stiffeners. Strain-gage surveys were made to determine the redistribution of stress as the crack grew across the panels. As a crack approached a given point in the skin, the stress at that point increased rapidly. The stress in the stiffeners also increased as the crack approached the stiffeners. During the propagation of the crack the stress was not distributed uniformly in the remaining area.

Download or read book Periodic Overload and Transport Spectrum Fatigue Crack Growth Tests of Ti62222STA and Al2024T3 Sheet written by Edward P. Phillips and published by . This book was released on 1999 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: