Download or read book The Effect of Strain Rate on the Cyclic Stress Strain Response of Metals written by David K. Benson and published by . This book was released on 1973 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monotonic and cyclic strain hardening parameters were measured for five alloys: 7075-T6 aluminum; 6061-T651 aluminum; an alpha/beta brass (alloy 365); copper-1.9% beryllium (alloy 172); and martensitic 4340E steel. Cyclic measurements were made under fully reversed strain control at constant strain rate by the incremental step test. A maximum strain range of plus or minus 0.015 and strain rates of 0.003, 0.03, 0.10 and 0.30/sec were used. The cyclic softening/hardening behavior of the alloys was predictable on the basis of established empirical rules. The cyclic stress-strain coefficients K' and exponents n' were independent of strain rate and had the values: 7075-T6 (105Ksi, 0.06); 6061-T651 (60 Ksi, 0.06); brass (132 Ksi, 0.21); copper-beryllium (165 Ksi, 0.13); 4340E steel (300 Ksi, 0.19). Adiabatic heating in high-strength materials appears to impose an upper limit (

Download or read book The Effect of Strain Rate on the Cyclic Response of Metals written by J. R. Hancock and published by . This book was released on 1974 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unidirectional and cyclic strain hardening parameters were measured for several metals and alloys. Cyclic measurements were made under fully reversed strain control at constant strain rates between 0.003 and 0.3/sec. The cyclic strain hardening followed a power law relationship with no distinct dependence upon strain rate. (Author).

Download or read book Cyclic Stress strain Behavior analysis Experimentation and Failure Prediction written by and published by ASTM International. This book was released on 1971 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metallurgical Effects at High Strain Rates written by R. Rohde and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: A conference on Metallurgical Effects at High Strain Rates was held at Albuquerque, New Mexico, February 5 through 8, 1973, under joint sponsorship of Sandia Laboratories and the Physical Metallurgy Committee of The Metallurgical Society of AIME. This book presents the written proceedings of the meeting. The purpose of the conference was to gather scientists from diverse disciplines and stimulate interdisciplinary discussions on key areas of materials response at high strain rates. In this spirit, it was similar to one of the first highly successful con ferences on this subject held in 1960, in Estes Park, Colorado, on The Response of Metals to High Velocity Deformation. The 1973 conference was able to demonstrate rather directly the increased understanding of high strain rate effects in metals that has evolved over a period of roughly 12 years. In keeping with the interdisciplinary nature of the meeting, the first day was devoted to a tutorial session of invited papers to provide attendees of diverse backgrounds with a common basis of understanding. Sessions were then held with themes centered around key areas of the high strain rate behavior of metals.

Download or read book Cyclic Plasticity and Low Cycle Fatigue Life of Metals written by Jaroslav Polák and published by Elsevier Publishing Company. This book was released on 1991 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardbound. Low cycle fatigue failures have been identified as being connected with the low number of repeated working cycles of equipment which usually results from start-up, shut-down operations, or some necessary interruption of ordinary use. The vast amount of research carried out so far has shown that only detailed knowledge of the proper mechanisms, and thus recognition of the important parameters governing the fatigue failure, can effectively improve engineering design procedures. This book concentrates on the physical metallurgy approach to elastoplastic cyclic straining and its relation to the fatigue life of metals. Recent breakthroughs in the understanding of the appropriate mechanisms is summarized and the importance of short crack growth is emphasised. Special attention is given to the identification of the basic mechanisms underlying cyclic plastic straining, damage evolution, fatigue crack initiation and growth, which results in final frac

Download or read book Fatigue Damage Crack Growth and Life Prediction written by F. Ellyin and published by Springer Science & Business Media. This book was released on 1996-11-30 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue failure is a multi-stage process. It begins with the initiation of cracks, and with continued cyclic loading the cracks propagate, finally leading to the rupture of a component or specimen. The demarcation between the above stages is not well-defined. Depending upon the scale of interest, the variation may span three orders of magnitude. For example, to a material scientist an initiated crack may be of the order of a micron, whereas for an engineer it can be of the order of a millimetre. It is not surprising therefore to see that investigation of the fatigue process has followed different paths depending upon the scale of phenomenon under investigation. Interest in the study of fatigue failure increased with the advent of industrial ization. Because of the urgent need to design against fatigue failure, early investiga tors focused on prototype testing and proposed failure criteria similar to design formulae. Thus, a methodology developed whereby the fatigue theories were proposed based on experimental observations, albeit at times with limited scope. This type of phenomenological approach progressed rapidly during the past four decades as closed-loop testing machines became available.

Download or read book Inelastic Deformation of Metals written by Donald C. Stouffer and published by John Wiley & Sons. This book was released on 1996-01-05 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a totally new approach, this groundbreaking book establishesthe logical connections between metallurgy, materials modeling, andnumerical applications. In recognition of the fact that classicalmethods are inadequate when time effects are present, or whencertain types of multiaxial loads are applied, the new, physicallybased state variable method has evolved to meet these needs.Inelastic Deformation of Metals is the first comprehensivepresentation of this new technology in book form. It developsphysically based, numerically efficient, and accurate methods forpredicting the inelastic response of metals under a variety ofloading and environmental conditions. More specifically, Inelastic Deformation of Metals: * Demonstrates how to use the metallurgical information to developmaterial models for structural simulations and low cyclic fatiguepredictions. It presents the key features of classical and statevariable modeling, describes the different types of models andtheir attributes, and provides methods for developing models forspecial situations. This book's innovative approach covers such newtopics as multiaxial loading, thermomechanical loading, and singlecrystal superalloys. * Provides comparisons between data and theory to help the readermake meaningful judgments about the value and accuracy of aparticular model and to instill an understanding of how metalsrespond in real service environments. * Analyzes the numerical methods associated with nonlinearconstitutive modeling, including time independent, time dependentnumerical procedures, time integration schemes, inversiontechniques, and sub-incrementing. Inelastic Deformation of Metals is designed to give theprofessional engineer and advanced student new and expandedknowledge of metals and modeling that will lead to more accuratejudgments and more efficient designs. In contrast to existing plasticity books, which discuss few if anycorrelations between data and models, this breakthrough volumeshows engineers and advanced students how materials and modelsactually do behave in real service environments. As greater demandsare placed on technology, the need for more meaningful judgmentsand more efficient designs increases dramatically. Incorporatingthe state variable approach, Inelastic Deformation of Metals: * Provides an overview of a wide variety of metal responsecharacteristics for rate dependent and rate independent loadingconditions * Shows the correlations between the mechanical response propertiesand the deformation mechanisms, and describes how to use thisinformation in constitutive modeling * Presents different modeling options and discusses the usefulnessand limitations of each modeling approach, with material parametersfor each model * Offers numerous examples of material response and correlationwith model predictions for many alloys * Shows how to implement nonlinear material models in stand-aloneconstitutive model codes and finite element codes An innovative, comprehensive, and essential book, InelasticDeformation of Metals will help practicing engineers and advancedstudents in mechanical, aerospace, civil, and metallurgicalengineering increase their professional skills in the moderntechnological environment.

Download or read book Cyclic Stress strain Behavior analysis Experimentation and Failure Prediction written by and published by . This book was released on 1973 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue of Metallic Materials written by M. Klesnil and published by Elsevier. This book was released on 1992-04-13 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews problems in the mechanical behaviour of cyclically loaded metallic materials, primarily with regard to the nature of the fatigue process. The first edition of the book appeared in 1980. The present second edition represents a revised form of the original book and also covers recent developments in the field. As the book focuses on physical-metallurgical aspects, it occupies a unique and important position in the technical literature, which has so far been devoted mainly to engineering metal fatigue problems and their technical solution in specific practical cases. The book provides a compact review of current knowledge on physical metallurgical processes that accompany and affect the fatigue of metallic materials, and also presents the background for applying the new results to practical designing and to the selection of materials in engineering practice. The authors present an updated review of results from countries both in the east and the west and cover a relatively large field in a concise manner. The work will be of value to research workers and students following advanced and post-graduate courses in the fields of materials science and mechanical engineering.

Download or read book Effects of Moderately High Strain Rates on the Tensile Properties of Metals written by D. P. Moon and published by . This book was released on 1961 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monotonic and Cyclic Stress strain Response of Annealed 2 1 4 Cr 1 Mo Steel written by and published by . This book was released on 1975 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The stress-strain response of isothermally annealed 2$sup 1$/$sub 4$ Cr-- 1 Mo steel under monotonic and cyclic loadings was characterized at 21 to 593$sup 0$C. Monotonic stress-strain curves were developed for uniaxial tensile loading of speciments at strain rates of 8.33 x 10$sup -5$ and 8.33 x 10$sup -6$ s$sup -1$. The cyclic stress-strain response was measured for the first 100 fully reversed strain cycles at strain ranges between 0.4 and 3.0 percent under uniaxial loading at a strain rate of 8.33 x 10$sup -5$ s$sup -1$. The effects of creep, stress-relaxation, and thermal-exposure hold periods on the cyclic stress- strain behavior were also investigated at 510$sup 0$C. Monotonic stress-strain curves were quantified using a power law relation between stress range and plastic-strain range. Cyclic hardening was observed at temperatures up to 427$sup 0$C. A mixture of initial cyclic hardening followed by later cyclic softening was seen at temperatures from 482 to 538$sup 0$C, and cyclic softening was observed at 593$sup 0$C. One measure of the cyclic stress-strain response was characterized by the ascending path of the stress-strain hysteresis loop for the tenth cycle. The reported results form part of the data base to be used by others in formulating similar general inelastic constitutive equations for analysis of 2$sup 1$/$sub 4$ Cr-1 Mo steel components. (auth).

Download or read book Effect of Elevated Temperatures on the Low Cycle Fatigue of 2 25Cr 1Mo Steel Part I written by J. Helešic and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 2.25Cr-1Mo steel was subjected to constant amplitude straining in the temperature interval 22 to 550°C. The conventional low-cycle fatigue properties at 22, 350, 450, and 550°C at constant diametral strain rate ??d = 5 x 10-3 s-1 were measured. The fatigue hardening-softening curves, cyclic stress-strain curves, and Manson-Coffin curves were obtained at each temperature. A detailed study of the cyclic stress-strain response was performed on a computer-controlled electrohydraulic machine. The temperature dependence of the cyclic yield stress was measured using a multiple step test procedure. The stress-dip procedure in cyclic straining was adopted in order to separate the effective and internal component of the cyclic stress. The dependence of both components on temperature and during fatigue life was measured.

Download or read book Materials at High Strain Rates written by T.Z. Blazynski and published by Springer Science & Business Media. This book was released on 1987-07-31 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atlas of Stress strain Curves written by Howard E. Boyer and published by ASM International(OH). This book was released on 1987 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains over 600 stress-strain curves for ferrous and nonferrous alloys. Curves show monotonic versus cyclic behaviour, effect of strain rate, alloying elements, product forms, deformation mode, grain size, work hardening, temperature, and more.

Download or read book An Experimental Determination of the Stress strain Rate Relations of Several Metals written by Ulric Svante Lindholm and published by . This book was released on 1960 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineering Analysis of the Inelastic Stress Response of a Structural Metal Under Variable Cyclic Strains written by HR. Jhansale and published by . This book was released on 1971 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inelastic stress response under strain cycling conditions is analyzed in terms of the three important governing phenomena, namely, memory of prior history, cyclic hardening or softening, and cyclic mean stress relaxation. Independent formulations to describe these respective features consist of a set of hysteresis rules, a set of transient stress-strain relations, and an empirical exponential model. A new approach to accurately describe the hysteresis loop shape characteristics is also presented. while strain amplitude and number of cycles are used as the primary variables influencing cyclic hardening, softening, and relaxation, the effect of other variables on these features and hence their mutual interactions are observed to be small. Therefore, as a first approximation it is postulated that independent formulations based on constant amplitude test data are applicable to spectrum loading situations. Computer based models resulting from this analysis are suitable for predicting the cyclic stress-strain and fatigue response of ductile structural metals and also provide a basis for developing general flexural response models.