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Crack Arrest Fracture Toughness Of 7075 T6 Aluminum Alloy
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Book Synopsis Crack Arrest Fracture Toughness of 7075-T6 Aluminum Alloy by : D. McCluskey
Download or read book Crack Arrest Fracture Toughness of 7075-T6 Aluminum Alloy written by D. McCluskey and published by . This book was released on 1988 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plane-strain fracture toughness KIc represents the resistance of a material against crack initiation. The material toughness in the case of a run-arrest event involves a special "material property" called the crack arrest toughness KIa, which within certain limitations, is a measure of the ability of a material to arrest a fast running crack under linear elastic conditions. It has been indicated that KIa is a material property independent of specimen geometry, but this is not a universal belief. Whether or not KIa is a material property is still being debated. The objectives of this project were to measure the crack arrest fracture toughness of 7075-T6 aluminum alloy and to determine the effect of specimen size and thickness on KIa. The tests were performed in accordance with a proposed ASTM procedure developed for high-toughness and mediumstrength steels. Specimens that were used in this program exceeded the proposed minimum linear elastic size requirement of ferritic steel specimens by a factor of 4 between 2 and 10. KIa showed a slight dependence on test parameters such as stress intensity at crack initiation, specimen thickness, and crack jump lengths. However, KIa was not a strong function of the stress intensity at crack initiation K0. The mean value of KIa was an adequate representation of the crack arrest toughness value within the test matrix. The average KIa was only 10% lower than the average plane-strain fracture toughness KIc.
Book Synopsis Crack Arrest Behavior of a High-Strength Aluminum Alloy by : RG. Hoagland
Download or read book Crack Arrest Behavior of a High-Strength Aluminum Alloy written by RG. Hoagland and published by . This book was released on 1985 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports on a series of crack arrest tests on two lots of 7075-T651 high strength aluminum alloy. The tests were performed and the data analyzed in accordance with procedures developed for high toughness, medium strength steels. Both KID and KIa are reported and the results show that these crack arrest parameters behave considerably differently than in the case of medium strength steels. Problems with specimen size requirements, fracture mode transitions, and generation of unbroken ligaments were not factors affecting the present results; their absence may, at least in part, account for these differences. Also, the strain-rate sensitivity of the flow strength of this aluminum alloy is considerably less than that of ferritic steels and this may also be important.
Download or read book Fracture Mechanics written by D. T. Read and published by ASTM International. This book was released on 1988 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness by : RC. Dorward
Download or read book Estimating Plane Strain Fracture Toughness of High Strength Aluminum Alloys from Crack Arrest Toughness written by RC. Dorward and published by . This book was released on 1977 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparison is made between fracture toughness KIc as measured by recommended ASTM procedures and crack arrest toughness KIa as measured on more than 100 bolt-loaded double-cantilever beam (DCB) specimens from 7075, 7050, and 7049 alloy plates. Close agreement was found between the two values, KIa being on the average about 0.75 ksiin. (0.82 MPa?m) lower than than KIc over the range 18 to 29 ksiin. (20 to 32 MPa?m). This indicates that a simplified test based on a bolt-loaded DCB specimen could be used for quality control, lot release, and screening purposes. Measurements of crack length and specimen deflection are all that are required; the specimens do not have to be fatigue precracked, nor is a tensile machine needed.
Book Synopsis Fatigue Crack Propagation in 2024-T3 and 7075-T6 Aluminum Alloys at High Stresses by : Robert G. Dubensky
Download or read book Fatigue Crack Propagation in 2024-T3 and 7075-T6 Aluminum Alloys at High Stresses written by Robert G. Dubensky and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Fatigue and Fracture in 7075-T6 Aluminum Alloy in Vacuum and Air Environments by : Charles Michael Hudson
Download or read book A Study of Fatigue and Fracture in 7075-T6 Aluminum Alloy in Vacuum and Air Environments written by Charles Michael Hudson and published by . This book was released on 1973 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Axial load fatigue life, fatigue-crack propagation, and fracture toughness experiments were conducted on sheet specimens made of 7075-T6 aluminum alloy. These experiments were conducted at pressures ranging from atmospheric to 5 x 10 to the minus 8th torr. Analysis of the results from the fatigue life experiments indicated that for a given stress level, lower air pressures produced longer fatigue lives. At a pressure of 5 x 10 to the minus 8th torr fatigue lives were 15 or more times as long as at atmospheric pressure. Analysis of the results from the fatigue crack propagation experiments indicated that for small stress intensity factor ranges the fatigue crack propagation rates were up to twice as high at atmospheric pressure as in vacuum. The fracture toughness of 7075-T6 was unaffected by the vacuum environment. Fractographic examination showed that specimens tested in both vacuum and air developed fatigue striations. Considerably more striations developed on specimens tested at atmospheric pressure, however.
Book Synopsis Fracture Toughness and Subcritical Crack Growth in 7075-T6 Aluminum as Determined by Inclusion Spacing by : Robert John Harrington
Download or read book Fracture Toughness and Subcritical Crack Growth in 7075-T6 Aluminum as Determined by Inclusion Spacing written by Robert John Harrington and published by . This book was released on 1969 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Service Usage on Tensile, Fatigue, and Fracture Properties of 7075-T6 and 7178-T6 Aluminum Alloys by : Richard A. Everett
Download or read book Effect of Service Usage on Tensile, Fatigue, and Fracture Properties of 7075-T6 and 7178-T6 Aluminum Alloys written by Richard A. Everett and published by . This book was released on 1975 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Microstructure and Plane Strain Fracture Toughness of High Strength Aluminum Alloys by : Peter John Guest
Download or read book The Microstructure and Plane Strain Fracture Toughness of High Strength Aluminum Alloys written by Peter John Guest and published by . This book was released on 1967 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Crack Resistance Properties of High Strength Aluminum Alloys by : Carl M. Carman
Download or read book Crack Resistance Properties of High Strength Aluminum Alloys written by Carl M. Carman and published by . This book was released on 1965 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fracture toughness of both commercial and high purity aluminum alloys of the 7000 and 2000 series was determined by means of the center notched sheet specimen. The instability conditions described here give reproducible and well defined values of fracture toughness. For the very high strength aluminum alloys, the four inch wide specimen is sufficiently large to give accurate values of fracture toughness. Both the compliance and photographic method give the same value of fracture toughness, provided the proper experimental conditions are met. The testing conditions for the 2000 series of aluminum alloys do not conform to the normal requirements for simple fracture mechanics analysis, but the data may be analyzed within the framework of a refined instability model. The fracture toughness of the 2000 series of aluminum alloys is greater than the fracture toughness of the 7000 series. Reduction of iron and silicon contents results in an upgrading of the fracture toughness for both 7075-T6 and 2024-T4 aluminum alloys. Quantitative fractography gives some insight into the mechanisms which may be responsible for the upgrading of the fracture toughness. (Author).
Book Synopsis Fracture Mechanics and Acoustic Emission Response of Retrogression-Reaged 7075-T6 Aluminum Alloy by : K. I. McRae
Download or read book Fracture Mechanics and Acoustic Emission Response of Retrogression-Reaged 7075-T6 Aluminum Alloy written by K. I. McRae and published by . This book was released on 1982 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress corrosion cracking of high strength, structural aluminum alloys, such as 7075 in the T6 temper, is a commonly encountered problem. Recently, an alternative heat treatment, known as retrogression and reaging, has been proposed. It is purported that this heat treatment imparts a stress corrosion cracking resistance for 7075-T6 equal to that of the T73 temper, with only a negligible decrease in yield strength. In order to fully characterize this heat treatment, the plane strain fracture toughness, KIc, and the resistance to fatigue crack growth were compared to those of the same alloy in the normal T6 condition. Small increases in each of these mechanical properties were detected. The acoustic emission (AE) response to crack growth during testing was also investigated. It was determined that the number of AE signals is proportional to the crack length or total crack area. This response is consistent with proposed mechanisms for acoustic emission in this material. It is further noted that no significant difference exists in the AE response of 7075-T6 in the normal and retrogression-reaged conditions. (Author).
Book Synopsis Fatigue Life, Fatigue Crack Propagation and Fracture Toughness Study of 7075 Aluminum Alloy Subjected to Thermomechanical Processing by : Moon Hee Lee
Download or read book Fatigue Life, Fatigue Crack Propagation and Fracture Toughness Study of 7075 Aluminum Alloy Subjected to Thermomechanical Processing written by Moon Hee Lee and published by . This book was released on 1984 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to its high strength/weight ratio, 7075 aluminum alloy has been widely used as an aerospace material. However, it has relatively low fatigue strength and low fracture toughness in the T6 condition. Thermomechanical processing, including pre-cyclic loading and stretching at high and ambient temperatures, has been investigated with the aim of improving these properties. Fatigue life tests show that all four thermomechanical processes investigated increase the fatigue life at low stress levels, but cause a reduction at high stress levels. The effect of the precipitate free zone (PFZ) width on the fatigue crack propagation rate and fracture toughness has also been investigated. The fatigue crack propagation rate of the alloy with a wide PFZ was found to be approximately the same as that of the alloy with a narrow PFZ under similar conditions of cyclic loading. The alloy with the wide PFZ demonstrated a greater value of fracture toughness than that shown by the alloy with the narrow PFZ. These experimental results have been analyzed taking recently proposed theoretical models into account. Transmission electron microscopy showed that a large number of dislocations were generated within the soft PFZ areas as a result of the cyclic pre-loading. This is believed to contribute to the increase in fatigue life at low applied stress levels. Scanning electron microscopy has shown an intergranular fracture mode for the alloy with the narrow PFZ and a dimple rupture mode for the alloy with the wide PFZ.
Book Synopsis Fatigue-Crack Propagation in Aluminum-Alloy Tension Panels by : Richard E. Whaley
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.
Book Synopsis Fracture Toughness and Fatigue Crack Growth Properties of 7175-T736 Aluminum Alloy Forging at Several Temperatures by :
Download or read book Fracture Toughness and Fatigue Crack Growth Properties of 7175-T736 Aluminum Alloy Forging at Several Temperatures written by and published by . This book was released on 1972 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tensile, fracture toughness, and crack growth properties of a 7175-T736 aluminum alloy forging were investigated at various temperatures from -65 deg F to 350 deg F. Room temperature tensile and fracture toughness data was compared to similar properties for wrought 7075 products. The 7175 appears to be a better alloys. Fatigue crack growth rates at room temperature were similar to 7075-T6 and 7075-T7352 crack growth data in the literature. Crack growth rates increased with increasing temperature from room temperature to 350 deg F. Crack growth rates below room temperature were probably affected by humidity variations causing condensation of moisture at the crack tip and results were inconsistent.
Book Synopsis Fracture Toughness and Crack Growth Rates in Friction Stir Welded Joints of AL 7075-T651 by : Christopher Kempf
Download or read book Fracture Toughness and Crack Growth Rates in Friction Stir Welded Joints of AL 7075-T651 written by Christopher Kempf and published by . This book was released on 2004 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Friction stir welding is an aluminum plate joining process that has been found to be more superior to that of fusion welding. The need for information on this process regarding its response to fracture is vital in understanding the working life of high strength aluminum alloy plate structures in the aerospace industry. The objective of this study is 1) to perform plane strain fracture toughness tests to understand how the friction stir welded material will resist crack growth both in the longitudinal (T-L) and transverse (L-T) planes, 2) to perform plane strain fracture toughness tests through the weak areas of the weld, and 3) to perform tests on fatigue crack growth rates through the weak areas of the welds"--Abstract, leaf iii.
Book Synopsis Effect of Stress Ratio on Fatigue-crack Growth in 7075-T6 and 2024-T3 Aluminum-alloy Specimens by : C. M. Hudson
Download or read book Effect of Stress Ratio on Fatigue-crack Growth in 7075-T6 and 2024-T3 Aluminum-alloy Specimens written by C. M. Hudson and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress ratio effects on fatigue crack growth in sheet aluminum alloys.
