Download or read book The Relationship Between High Cycle Fatigue and Tensile Properties in Cast Aluminum Alloys written by Hüseyin Özdeș and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cast aluminum alloys are common in automotive and aerospace applications due to their high strength-to-density ratio. Fracture data for cast aluminum alloys, such as fatigue life, tensile strength and elongation, are heavily affected by the structural defects, such as pores and bifilms. There have been numerous studies in which either fatigue performance or tensile deformation were characterized and linked to casting defects. However, a comprehensive study that correlates tensile and fatigue properties has not been reported. The present study is motivated to fill this gap. The main objective of the investigation is to analyze the link between tensile and fatigue performance of commonly used cast aluminum alloys, and determine whether fatigue performance of cast aluminum alloys can be predicted. To accomplish this task, four research questions were developed: (i) how well do equations developed to account for mean stress effects perform in cast aluminum alloys, especially in datasets with various levels of structural quality, (ii) is the strong correlation between fatigue life and structural quality index obtained from tensile data reported for A206 alloy castings applicable to other aerospace and automotive casting alloys, (iii) how do methods to estimate high cycle fatigue from tensile data perform with aluminum castings, and (iv) can the axial fatigue performance of an A356-T6 casting be predicted from rotating beam fatigue data. Among the three mean stress correction models analyzed by using seven datasets from the literature, the one developed by Walker with an adjustable exponent has provided the best fit. It has been hypothesized that the adjustable Walker parameter is related to the structural quality index, QT, estimated from tensile data. Results have shown that there is indeed a strong correlation between QT and the Walker parameter. Moreover the parameters of the xvi Weibull distribution estimated from corrected data have been found to be strongly influenced by the mean stress correction method used. Tensile and fatigue life data for 319, D357 and B201 aluminum alloy castings reported in the literature have been reanalyzed by using a maximum likelihood method to estimate Basquin parameters in datasets with run-outs, Weibull statistics for censored data and mean stress correction. After converting tensile data to QT, a distinct relationship has been observed between the expected fatigue life and mean quality index for all alloys. Moreover, probability of survival in fatigue life has been found to be directly linked to the proportions of the quality index distributions in two different regions, providing further evidence about the strong relationship between elongation, i.e., structural quality, and fatigue performance [1]. Specimen geometry has been found to make the largest difference whereas the two aerospace alloys, B201 and D357, with distinctly different microstructures, have followed the same relationship, reinforcing the findings in the literature that fatigue life in aluminum castings is mainly determined by the size distribution and number density of structural defects. Six methods to predict fatigue life from tensile data have been compared by using data from the literature as well as the experimental A356 data developed in this study. Results have shown that none of the six methods provide reliable results. The consistently poor performance of the methods developed for steels and wrought alloys can be attributed to the major structural defects, namely bifilms, in aluminum castings. A new method to estimate the S-N curve from tensile data have been developed by using data for seventy-one S-N curves have been collected and Basquin parameters have been determined. Analysis showed that there is a strong relationship between QT and the Basquin exponent. xvii The Basquin parameters estimated by using the empirical relationships developed in the present study have provided better fits to the same datasets tested for the six methods. Hence the model developed in this study is proposed as the most reliable method to estimate high cycle fatigue properties. Finally, three methods to convert rotating bending fatigue test results to uniaxial fatigue data have been investigated by using the data developed in this study. Results have indicated that the method developed by Esin, in which both the fatigue life and alternating stress are corrected, provide the best estimate. Analyses of fracture surfaces of broken specimens via scanning electron microscopy have shown that tensile, axial fatigue and rotating beam fatigue properties are all strongly influenced by the same structural defects, confirming the validity of the approach taken in this study.

Download or read book Properties of Aluminum Alloys written by John Gilbert Kaufman and published by ASM International. This book was released on 2008-01-01 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of data collected and maintained for many years as the property of a large aluminum company, which decided in 1997 to make it available to other engineers and materials specialists. In tabular form, presents data on the tensile and creep properties of eight species of wrought alloys and five species of cast alloys in the various shapes used in applications. Then looks at the fatigue data for several alloys under a range of conditions and loads. The data represent the typical or average findings, and though some were developed years ago, the collection is the largest and most detailed available. There is no index.

Download or read book Metal Fatigue Effects of Small Defects and Nonmetallic Inclusions written by Yukitaka Murakami and published by Elsevier. This book was released on 2002-04-29 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal fatigue is an essential consideration for engineers and researchers who are looking at factors that cause metals to fail through stress, corrosion, etc. This is an English translation of a book originally published in Japan in 1993, with an additional two chapters on the fatigue failure of steels and the effect of surface roughness on fatigue strength. The methodology is based on important and reliable results and may be usefully applied to other fatigue problems not directly treated in this book.

Download or read book Tensile Properties and Sheet bending Fatigue Properties of Some Refractory Metals at Room Temperature written by Lee R. Foster and published by . This book was released on 1963 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of tensile stress-strain tests and completely reversed sheet-bending fatigue tests conducted at room temperature on unnotched sheet specimens of Ta-lOW tantalum alloy, D-3l niobium alloy, pure tungsten, and Mo-0.5Ti molybdenum alloy are presented. Fatigue data from tests on similar specimens of 2024-T3 aluminum alloy and 17-7 PH stainless steel are compared with previous data from axial-load tests on larger specimens of these materials to determine whether the small size of the specimens used in this investigation produces representative results. Comparisons of the various materials on the basis of applied-stress- ultimate-strength and strength-density ratio also are presented.

Download or read book Properties of Aluminum Alloys written by John Gilbert Kaufman and published by ASM International. This book was released on 1999-01-01 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of data collected and maintained for many years as the property of a large aluminum company, which decided in 1997 to make it available to other engineers and materials specialists. In tabular form, presents data on the tensile and creep properties of eight species of wrought alloys and five species of cast alloys in the various shapes used in applications. Then looks at the fatigue data for several alloys under a range of conditions and loads. The data represent the typical or average findings, and though some were developed years ago, the collection is the largest and most detailed available. There is no index.

Download or read book A Comparison of the Fatigue Behavior of High Strength Cast Aluminum Alloys 201 and A357 written by K. J. Oswalt and published by . This book was released on 1971 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The notched fatigue strength of high strength aluminum casting alloys A357 and 201 was evaluated using separately cast round tensile bar coupons. These results are considered satisfactory for comparison purposes of the alloys, but should not be used for design criteria. The results are plotted in the form of S/N curves. The materials are also compared by ultimately failing the surviving fatigue specimens in tension and then by comparing microstructures of the test specimens exhibiting highest and lowest ultimate tensile strengths. The notched tensile strength of 201 was higher than A357; notched strength values of 201 specimens were reduced by partial eutectic melting and undissolved eutectic in grain boundary regions.

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.

Download or read book Correlation of Literature on the Effect of Testing Temperature on the Mechanical Properties of Wrought Aluminum Base Alloys written by Helen R. Pritchard and published by . This book was released on 1955 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue of Aluminum written by Richard Laurence Templin and published by . This book was released on 1954 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book An Investigation of Quasi static Behavior High Cycle Fatigue and Final Fracture Behavior of Aluminum Alloy 2024 and Aluminum Alloy 2219 written by Satish Vasudevan and published by . This book was released on 2007 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Fatigue is one of the very important factors that causes failure in structures used in aircraft construction. Prevention of fatigue failure has been of concern in the aircraft industry for many years. There have been developments to put forth new materials such as AA2024 and AA2219. Along with new materials, there has also been new fabrication processes, improved design concepts such as the inception of fruction stir welding (FSW). Considering the fact that aluminum is extensively used in the aircraft industry, this research study involves testing and analysis of two conventional aluminum alloys namely a friction stir welded aluminum alloy 2024-T8 and aluminum alloy 2219-T62 in simple tension and in cyclic fatigue. Uniaxial tensile tests and cyclic stress amplitude controlled fatigue tests were carried out on samples from both the materials at stress ratios of R=0.1 and R=0.3. The conjoint influence of weld parameter and intrinsic microstructural features on hardness, tensile response and high cycle fatigue response was studied. The microscopic mechanisms governing quasi-static fracture and high cycle fatigue fracture are rationalized in light of intrinsic microstructural features of the alloy, deformation characteristics of the alloy microstructure, and nature of loading. All the tests were carried out at room temperature at the University of Akron. This study will provide useful and usable information relevant to the fatigue behavior of the aluminum alloys chosen."--Abstract.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Properties of Aluminum Alloys at Various Direct Stress Ratios written by B.J. Lazan and published by . This book was released on 1953 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Plasticity and Fatigue at High Temperature written by Denis Benasciutti and published by MDPI. This book was released on 2020-05-20 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: In several industrial fields (such as automotive, steelmaking, aerospace, and fire protection systems) metals need to withstand a combination of cyclic loadings and high temperatures. In this condition, they usually exhibit an amount—more or less pronounced—of plastic deformation, often accompanied by creep or stress-relaxation phenomena. Plastic deformation under the action of cyclic loadings may cause fatigue cracks to appear, eventually leading to failures after a few cycles. In estimating the material strength under such loading conditions, the high-temperature material behavior needs to be considered against cyclic loading and creep, the experimental strength to isothermal/non-isothermal cyclic loadings and, not least of all, the choice and experimental calibration of numerical material models and the selection of the most comprehensive design approach. This book is a series of recent scientific contributions addressing several topics in the field of experimental characterization and physical-based modeling of material behavior and design methods against high-temperature loadings, with emphasis on the correlation between microstructure and strength. Several material types are considered, from stainless steel, aluminum alloys, Ni-based superalloys, spheroidal graphite iron, and copper alloys. The quality of scientific contributions in this book can assist scholars and scientists with their research in the field of metal plasticity, creep, and low-cycle fatigue.

Download or read book The Fatigue Properties of Some Al Cu Alloys written by Donald Paul Kedzie and published by . This book was released on 1962 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reliability Engineering written by Elsayed A. Elsayed and published by John Wiley & Sons. This book was released on 2021-01-07 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt: Get a firm handle on the engineering reliability process with this insightful and complete resource Named one of the Best Industrial Management eBooks of All Time by BookAuthority As featured on CNN, Forbes and Inc – BookAuthority identifies and rates the best books in the world, based on recommendations by thought leaders and experts The newly and thoroughly revised 3rd Edition of Reliability Engineering delivers a comprehensive and insightful analysis of this crucial field. Accomplished author, professor, and engineer, Elsayed. A. Elsayed includes new examples and end-of-chapter problems to illustrate concepts, new chapters on resilience and the physics of failure, revised chapters on reliability and hazard functions, and more case studies illustrating the approaches and methodologies described within. The book combines analyses of system reliability estimation for time independent and time dependent models with the construction of the likelihood function and its use in estimating the parameters of failure time distribution. It concludes by addressing the physics of failures, mechanical reliability, and system resilience, along with an explanation of how to ensure reliability objectives by providing preventive and scheduled maintenance and warranty policies. This new edition of Reliability Engineering covers a wide range of topics, including: Reliability and hazard functions, like the Weibull Model, the Exponential Model, the Gamma Model, and the Log-Logistic Model, among others System reliability evaluations, including parallel-series, series-parallel, and mixed parallel systems The concepts of time- and failure-dependent reliability within both repairable and non-repairable systems Parametric reliability models, including types of censoring, and the Exponential, Weibull, Lognormal, Gamma, Extreme Value, Half-Logistic, and Rayleigh Distributions Perfect for first-year graduate students in industrial and systems engineering, Reliability Engineering, 3rd Edition also belongs on the bookshelves of practicing professionals in research laboratories and defense industries. The book offers a practical and approachable treatment of a complex area, combining the most crucial foundational knowledge with necessary and advanced topics.

Download or read book Metal Matrix Composites written by Manoj Gupta and published by MDPI. This book was released on 2018-08-15 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Metal Matrix Composites" that was published in Metals