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Fatigue Crack Growth Properties Of Aluminium Alloy Bs 1477 Np8 Determined From Tests On 125mm Nominal Thickness Specimens Of Widely Differing Geometry
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Book Synopsis Fatigue Crack Growth Properties of Aluminium Alloy BS 1477 NP8 Determined from Tests on 12.5mm Nominal Thickness Specimens of Widely Differing Geometry by : Allan Storey
Download or read book Fatigue Crack Growth Properties of Aluminium Alloy BS 1477 NP8 Determined from Tests on 12.5mm Nominal Thickness Specimens of Widely Differing Geometry written by Allan Storey and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Bonding Temperatures on Fatigue Crack Growth by : Rodney L. Wilkinson
Download or read book Effects of Bonding Temperatures on Fatigue Crack Growth written by Rodney L. Wilkinson and published by . This book was released on 1983 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Changes in the crack growth behavior of 7075-T651 aluminum specimens which has been exposed to temperatures between 150 degrees and 355 degrees F (66 deg and 179 deg C) were evaluated. Specimens were fatigue tested at room temperature under flight-by-flight loading conditions. Results from these tests were then compared with data from the baseline (as received) material. Exposure to 250 deg F (121 deg C) or more produced a definite increase in speciment life, apparently due to a decrease in crack growth rates.
Book Synopsis Effect of Specimen Thickness on Fatigue-crack-growth Behavior and Fracture Toughness of 7075-T6 and 7178-T6 Aluminum Alloys by : Charles Michael Hudson
Download or read book Effect of Specimen Thickness on Fatigue-crack-growth Behavior and Fracture Toughness of 7075-T6 and 7178-T6 Aluminum Alloys written by Charles Michael Hudson and published by . This book was released on 1973 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Dents on Fatigue Life and Fatigue Crack Growth of Aluminum 2024-T3 Bare Sheet by : Praveen Shivalli
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 Synopsis Fracture Resistance of Aluminum Alloys by : John Gilbert Kaufman
Download or read book Fracture Resistance of Aluminum Alloys written by John Gilbert Kaufman and published by ASM International. This book was released on 2001 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kaufman prevents this summary of data on the fracture characteristics of aluminum alloys, broadly based on a publication by Alcoa in 1964, Fracture Characteristics of Aluminum Alloys . Coverage includes tensile properties as indicators of fracture behavior; notched-bar impact and related tests for t
Book Synopsis Constant Amplitude and Post-overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009 by :
Download or read book Constant Amplitude and Post-overload Fatigue Crack Growth Behavior in PM Aluminum Alloy AA 8009 written by and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The effect of thickness of fatigue crack propagation in 7475-T731 aluminum alloy sheet by : Ralph Anthony Daiuto
Download or read book The effect of thickness of fatigue crack propagation in 7475-T731 aluminum alloy sheet written by Ralph Anthony Daiuto and published by . This book was released on 1984 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Water Vapor on Fatigue Crack Growth in 7475-T651 Aluminum Alloy Plate by : DL. Dicus
Download or read book Effect of Water Vapor on Fatigue Crack Growth in 7475-T651 Aluminum Alloy Plate written by DL. Dicus and published by . This book was released on 1984 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was performed to assess the effects of water vapor on fatigue crack growth in 7475-T651 aluminum alloy plate at frequencies of 1 and 10 Hz. Twenty-five mm thick compact specimens were subjected to constant amplitude fatigue testing at a load ratio of 0.2. Fatigue crack growth rates were calculated from effective crack lengths determined by using a compliance method. Tests were conducted in hard vacuum and at water vapor partial pressures ranging from 94 Pa to 3.8 kPa.
Book Synopsis Spectrum Fatigue Crack Growth Rate Characteristics of Cast Aluminum Alloys A201-T7 and A357-T6 by : Jon D. Tirpak
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.
Book Synopsis Test Development and Materials Characterization Capability for High-Strength Aluminum Alloy Fatigue Crack Growth Response Under Mixed-Mode Loading Conditions by : M. James
Download or read book Test Development and Materials Characterization Capability for High-Strength Aluminum Alloy Fatigue Crack Growth Response Under Mixed-Mode Loading Conditions written by M. James and published by . This book was released on 2014 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: To meet operational efficiency and productivity demands of the 21st century marketplace, aerospace and transportation sector platforms are being driven to incorporate increasingly larger and more highly stressed unitized structural components. This recent trend has prompted the need for improved fatigue crack growth characterization methodologies to understand impact of relevant mixed-mode loading conditions on crack growth direction and life estimation. This paper describes the development of an Alcoa capability to study and model fatigue crack growth behavior under combined mode I and mode II loading in high-strength aluminum products. The objective is to demonstrate the experimental capability necessary to improve the basic understanding of the roles and synergistic effects of mixed-mode loading (modes I and II) and microstructural resistance, as they relate to fatigue crack growth direction and life estimation. The particular alloy selected for this study is aluminum alloy (AA) 7050-T7651 thick plate taken to be representative of a widely used material for aircraft thick structural parts. The specimens chosen for this capability study are based on the compact tension shear (CTS) specimen documented in the literature. Results are presented to demonstrate the development of stress-intensity factor and compliance solutions to automate the fatigue precracking step. Full-field strain measurements for a notched specimen are used to further validate the finite element analysis. In addition, preliminary results are presented to explore the feasibility of a Keq approach based on total strain-energy release rate to evaluate similitude in the fatigue crack growth rate relationship for the mixed-mode loading case. Preliminary fatigue crack growth test results show that under combined modes I and II loading, the fatigue crack growth rate and direction depend strongly on the competition between the mixed-mode crack-tip driving force and microstructural planes offering the weakest crack growth resistance.
Book Synopsis Plane-Stress Fracture Toughness and Fatigue-Crack Propagation of Aluminum Alloy Wide Panels by : D. Y. Wang
Download or read book Plane-Stress Fracture Toughness and Fatigue-Crack Propagation of Aluminum Alloy Wide Panels written by D. Y. Wang and published by . This book was released on 1973 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of panel width and crack length on fracture toughness and the fatigue crack propagation rate of Alclad 2024-T3 and X7475 were investigated in sheet specimens ranging from 30 to 120 in. wide. The unstiffened, wide panels containing a through-the-thickness central crack were tested under uniaxial loadings to generate fatigue crack growth, stable crack growth, and residual strength data. In addition, 48-in. wide 7075-T6 and 7079-T6 aluminum alloy panels were tested at -65° F to determine low-temperature effects. The analysis was conducted to define the parameters contributing to the apparent panel size effects and to outline the procedures to obtain valid data applicable to full-scale structural design. Excellent correlation was found in the stable crack growth resistance curve (KR versus ?a) data obtained from panels of various width which contained initial crack lengths ranging from 3.6 to 30 in. The results suggest that the crack growth resistance curve is a material parameter which is independent of crack length and panel width under an appropriate test condition. The effects of -65° F significantly reduce fatigue crack propagation resistance at a relatively high ?K level and stable static crack growth resistance of some aluminum alloy sheets.
Book Synopsis Influence of Environment and Specimen Thickness on Fatigue Crack Growth Data Correlation by Means of Elber-Type Equations by : HL. Ewalds
Download or read book Influence of Environment and Specimen Thickness on Fatigue Crack Growth Data Correlation by Means of Elber-Type Equations written by HL. Ewalds and published by . This book was released on 1983 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of environment and specimen thickness on crack closure in 2024 aluminum alloy were investigated by using constant-amplitude fatigue tests. Crack growth rates for all test conditions were correlated with ?Keff values derived from equations based on the crack closure theory of Elber. Crack closure behavior was confirmed to be independent of environment, except for a small deviation ascribed to corrosion product wedging. Surprisingly, the Elber-type equations worked equally well for all specimen thicknesses; a possible explanation is offered. These results have important implications with respect to fatigue crack growth prediction models based on crack closure effects.
Book Synopsis Fatigue Crack Growth Rate of Thick 5083-O Plate at Room and Low Temperatures by : NL. Person
Download or read book Fatigue Crack Growth Rate of Thick 5083-O Plate at Room and Low Temperatures written by NL. Person and published by . This book was released on 1975 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thick aluminum alloy 5083-O has gained wide usage in liquefied natural gas (LNG) tank construction. Fatigue crack growth rate (FCGR) characteristics are described for specimens obtained from 5083-O plate in thickness from about 1⁄2 to 7.75 in. Data were obtained from crack propagation gages and compared with data obtained by an ultrasonic technique. Crack growth rate was measured at 75 and -320°F. At -320°F, FCGR appeared to be substantially lower than at 75 °F in the second stage of growth; however, in the accelerated third stage of growth, the FCGR for the two temperatures were similar. Data show that location of specimen in relation to plate thickness can affect crack growth rate, depending on the crack orientation. From crack propagation gage measurements, it was determined that thickness of compact specimens, per se, (1 to 2 in.) had no effect on growth rate.
Book Synopsis Fatigue Crack Growth from Narrow-Band Gaussian Spectrum Loading in 6063 Aluminum Alloy by : JA. Van Den Avyle
Download or read book Fatigue Crack Growth from Narrow-Band Gaussian Spectrum Loading in 6063 Aluminum Alloy written by JA. Van Den Avyle and published by . This book was released on 1992 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant amplitude and narrow-band Gaussian loadings are applied to extruded 6063 aluminum crack-growth specimens in an effort to characterize the effective stress intensity levels during random loading. Crack-growth rates are determined for constant amplitude loadings at stress ratios (R) of 0.09, 0.3 and 0.5, and for a variable amplitude loading simulated to match a narrow-band Gaussian spectrum. Crack-opening stress levels measured by the compliance method during the constant amplitude loading are found to differ substantially for -T5 and -T6 heat treatments due to a change from intergranular to transgranular crack growth. Crack-opening load ratios correlate well with the maximum applied stress intensity factor, Kmax, for the -T5 material. The Kmax dependence leads to an effective halving of the crack-growth exponent. Calculated variable amplitude lives are much shorter when this correlation is taken into account (an acceleration effect) and show a greater difference between loading blocks condensed by racetrack filtering at threshold levels of two and four standard deviations, similar to what was observed in the tests. Crack-opening-load measurements in one specimen with the narrow-band Gaussian (variable amplitude) loading failed to detect any closure. A substantial difference in the closure behavior of nominally identical R = 0.3 tests indicates that closure may occur irregularly in the extruded aluminum. Calculated crack-growth lives, assuming no closure in the variable amplitude tests, are much shorter than the test results. Including closure in the variable amplitude loadings greatly improves the predictions.
