Download or read book Deformation of Aluminum Alloy Under Cyclic Creep Loadings written by ZL. Gong and published by . This book was released on 1991 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cyclic creep tests were conducted on an aluminum alloy at 160 and 200°C. Measured results indicated that mechanical load cycling with long dwell periods can produce significant creep acceleration. Such creep acceleration not only resulted in the increasing of minimum strain rate at subsequent loading cycles, but also reduced the creep rupture life of the material. Microstructure examinations by TEM and SEM were carried out to study microstructural damages under monotonic and cyclic loadings. Results indicated that remobilization of dislocation and damage enhancement during stress cycling were chiefly responsible for creep acceleration.
Download or read book Behavior of Materials Under Conditions of Thermal Stress written by S. S. Manson and published by . This book was released on 1953 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review is presented of available information on the behavior of brittle and ductile materials under conditions of thermal stress and thermal shock. For brittle materials, a simple formula relating physical properties to thermal-shock resistance are derived and used to determine the relative significance of two indices currently in use for rating materials. The importance of simulating operating conditions in thermal-shock testing is deduced from the formula and is experimentally illustrated by showing that BeO could be both inferior or superior to Al2O3 in thermal shock depending on the testing conditions. For ductile materials, thermal-shock resistance depends upon the complex interrelation among several metallurgical variables which seriously affect strength and ductility. These variables are briefly discussed and illustrated from literature sources. The importance of simulating operating conditions in tests for rating ductile materials is especially to be emphasized because of the importance of testing conditions in metallurgy. A number of practical methods that have been used to minimize the deleterious effects of thermal stress and thermal shock are outlined.
Download or read book Inelastic Deformation of an Aluminum Alloy Under Combined Stress at Elevated Temperature written by George Malcolm Brown and published by . This book was released on 1970 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biaxial stress tests were performed on thin wall tubes of polycrystalline 2024-T81 Aluminum at temperatures of 150 and 250c. The nominal metallurgical stabilization temperature for this alloy is 190c. Transient and steady state creep strain rates exhibited a considerable depenence on load path history. For a prescribed history it is possible to determine unique surfaces of constant creep strain rate. For the zero history, involving a single loading from the origin to a prescribed point in stress space, surfaces of constant steady state strain rate, at elevated temperature, have the same shape as room temperature yield surfaces of moderate offset. In the temperature and small strain regions considered here, room temperature yield surfaces were found to be unaffected by elevated temperature deformation. The changes in shape of room temperature yield surfaces, due to room temperature plastic deformation caused corresponding changes in the elevated temperature surfaces of constant steady state creep rate. At a given stress point, an outward local motion of the yield surface resulted in a corresponding outward local motion of the steady state creep rate surfaces. The experimental determination of surfaces of constant flow potential was also attempted. (Author).
Download or read book Hot Deformation and Processing of Aluminum Alloys written by Hugh J. McQueen and published by CRC Press. This book was released on 2016-04-19 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive treatise on the hot working of aluminum and its alloys, Hot Deformation and Processing of Aluminum Alloys details the possible microstructural developments that can occur with hot deformation of various alloys, as well as the kind of mechanical properties that can be anticipated. The authors take great care to explain and differenti
Download or read book Fatigue of Materials written by S. Suresh and published by Cambridge University Press. This book was released on 1998-10-29 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by a leading researcher in the field, this revised and updated second edition of a highly successful book provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, non-metals and composites. The author discusses the principles of cyclic deformation, crack initiation and crack growth by fatigue, covering both microscopic and continuum aspects. The book begins with discussions of cyclic deformation and fatigue crack initiation in monocrystalline and polycrystalline ductile alloys as well as in brittle and semi-/non-crystalline solids. Total life and damage-tolerant approaches are then introduced in metals, non-metals and composites followed by more advanced topics. The book includes an extensive bibliography and a problem set for each chapter, together with worked-out example problems and case studies. This will be an important reference for anyone studying fracture and fatigue in materials science and engineering, mechanical, civil, nuclear and aerospace engineering, and biomechanics.
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 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compressive and Tensile Creep of 7075 T6 and 2024 T3 Aluminum alloy Sheet written by George J. Heimerl and published by . This book was released on 1959 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The General Cyclic Stress Strain Response of Aluminum Alloys written by C. Laird and published by . This book was released on 1977 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cyclic stress-strain response of a wide range of binary, ternary, and complex commercial and experimental-commercial aluminum alloys has been investigated. In addition to constant-amplitude tests, incremental, block, random loading tests, and other specialized tests have been used in assessing cyclic response. The conditions under which cyclic hardening or softening occur have been elucidated, and general conclusions have been drawn about cyclic response in aluminum alloys.
Download or read book Cyclic Deformation Fracture and Nondestructive Evaluation of Advanced Materials written by Michael R. Mitchell and published by ASTM International. This book was released on 1992 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1961-07 with total page 1766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developments in Lightweight Aluminum Alloys for Automotive Applications written by James M Boileau and published by SAE International. This book was released on 2006-02-03 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of lightweight materials in automotive application has greatly increased in the past two decades. A need to meet customer demands for vehicle safety, performance and fuel efficiency has accelerated the development, evaluation and employment of new lightweight materials and processes. The 50 SAE Technical papers contained in this publication document the processes, guidelines, and physical and mechanical properties that can be applied to the selection and design of lightweight components for automotive applications. The book starts off with an introduction section containing two 1920 papers that examine the use of aluminum in automobiles.
Download or read book U S Government Research Reports written by and published by . This book was released on 1961 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Research on the Strength and Fracture of Materials written by D. M. R. Taplin and published by Elsevier. This book was released on 2013-10-22 with total page 747 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Research on the Strength and Fracture of Materials: Volume 2Bs—Fatigue contains the proceedings of the Fourth International Conference on Fracture, held at the University of Waterloo, Canada, in June 1977. The papers review the state of the art with respect to fracture in a wide range of materials such as metals and alloys. This volume is comprised of 85 chapters and opens by discussing the metallographic aspects of fatigue in pearlitic structures and the dislocation diffusion mechanism of fatigue crack formation. The reader is then introduced to localized plastic deformation and fracture in slip bands during fatigue loading of age hardening aluminum alloys; the microstructure of fatigue fracture surfaces in titanium; mechanisms of liquid metal embrittlement, stress corrosion cracking, and corrosion-fatigue; and the fatigue behavior of macroscopic slag inclusions in steam turbo-generator rotor steels. A model for fatigue crack initiation in polycrystalline solids is also described. This monograph will be a useful resource for metallurgists, materials scientists, and structural and mechanical engineers.
Download or read book On the Analysis of Thermally Activated Tension Tension Cyclic Deformation Behavior written by JS. Mshana and published by . This book was released on 1988 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of the transition state theory of rate processes to describe tension-tension cyclic deformation behavior was reviewed, leading to a coherent, unified theory for stress relaxation, creep, and strain and load controlled cyclic deformation. The study showed that over the stress, time, and temperature range where the rate of plastic flow can be approximated with activation over a single energy barrier, strain-controlled cyclic deformation is essentially a stress relaxation process, while creep is related to load-controlled cyclic deformation. The theory described well the deformation behavior of a near-eutectoid, zinc-aluminum alloy. The constitutive parameters determined from the analysis of stress relaxation, creep, and strain and load controlled cyclic loading experimental results were identical, leading to the conclusion that strain and load controlled cyclic deformations were different manifestations of the same basic process, depending on the control condition. Consequently, it was recommended that stress relaxation and creep can be employed to determine the constitutive parameters. By using the theory developed in this report, the cyclic deformation behavior can be predicted.
Download or read book Constant and Cyclic Load Creep Tests of Several Materials written by Ward F. Simmons and published by . This book was released on 1954 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: This investigation was made to determine whether alternate periods of load and rest would have the same effect as continuous loading on the deformation characteristics of metals at elevated temperatures. Constant-load and cyclic-load creep tests were made on sheet specimens of 24S-T3 and 24S-T81 aluminum alloys at 300 F, SAE 4130 steel at 800 F, and AISI 310 stainless steel at 1500 F. The test results indicate that under the conditions of these tests cycling the load did not increase the rate of creep of the materials tested. Also since none of the cyclic-load tests had creep rates less than one half the rate of the constant-load test, there was no evidence of recovery taking place during the low-load part of the cycle. Specimens of 24S-T3 showed less creep deformation during the first ten hours of the tests than did the corresponding tests of 24S-T81 alloy, although subsequent creep rates were essentially the same. The data obtained, although incomplete, indicate that it is probably safe to design for cyclic-load conditions using data from constant-load tests.
Download or read book Effect of Cyclic Creep Deformation on Microstructure in 1100 Aluminum written by Mary Akane Yamaoka and published by . This book was released on 1984 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Microstructural Features on the Response of Aluminum Alloys to Cyclic Deformation written by Edgar A Starke (Jr) and published by . This book was released on 1978 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This program has been designed to isolate and determine the various parameters which control the mechanical behavior during monotonic and cyclic loading of alloys containing various microstructural features developed during the decomposition of 7XXX type aluminum alloys. In addition, limited studies of the stress-corrosion resistance and corrosion-fatigue resistance has been made. The primary goal has been to understand the fundamentals of the deformation processes involved in monotonic and cyclic loading. The results obtained from this study should lead to improvements in the properties of existing alloy systems through control of the microstructure and suggest ways of developing fatigue resistant age-hardenable aluminum alloys. (Author).
