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Author: Eugene C. Naumann Publisher: ISBN: Category : Aerodynamics Languages : en Pages : 36
Book Description
An investigation has been conducted to determine which combination of method counting and type of load programing best retains the essential fatigue-inducing characteristics of a random time history of stress. In an earlier investigation several time histories were numerically generated and counted by various methods. The data obtained in the earlier investigation were used in this investigation to conduct axial load fatigue tests of 2024-T3 aluminum-alloy sheet specimens with not d edges. The fatigue life obtained from tests using the random peak history was used as a basis of comparison. The elimination of various sized fluctuations, due to the different counting methods, had little, if any, effect on fatigue life in tests using a random sequence of loads. Tests conducted by using ordered loading produced lives greater than the random fatigue life. The value of life in the ordered tests varied with the counting method, with statistical properties of the time history, and probably with the assumptions made in reducing the data to block form.
Author: Eugene C. Naumann Publisher: ISBN: Category : Aerodynamics Languages : en Pages : 36
Book Description
An investigation has been conducted to determine which combination of method counting and type of load programing best retains the essential fatigue-inducing characteristics of a random time history of stress. In an earlier investigation several time histories were numerically generated and counted by various methods. The data obtained in the earlier investigation were used in this investigation to conduct axial load fatigue tests of 2024-T3 aluminum-alloy sheet specimens with not d edges. The fatigue life obtained from tests using the random peak history was used as a basis of comparison. The elimination of various sized fluctuations, due to the different counting methods, had little, if any, effect on fatigue life in tests using a random sequence of loads. Tests conducted by using ordered loading produced lives greater than the random fatigue life. The value of life in the ordered tests varied with the counting method, with statistical properties of the time history, and probably with the assumptions made in reducing the data to block form.
Author: F. Ellyin Publisher: Springer Science & Business Media ISBN: 0412596008 Category : Technology & Engineering Languages : en Pages : 490
Book Description
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.
Author: David F. Anderson Publisher: Cambridge University Press ISBN: 110824498X Category : Mathematics Languages : en Pages : 447
Book Description
This classroom-tested textbook is an introduction to probability theory, with the right balance between mathematical precision, probabilistic intuition, and concrete applications. Introduction to Probability covers the material precisely, while avoiding excessive technical details. After introducing the basic vocabulary of randomness, including events, probabilities, and random variables, the text offers the reader a first glimpse of the major theorems of the subject: the law of large numbers and the central limit theorem. The important probability distributions are introduced organically as they arise from applications. The discrete and continuous sides of probability are treated together to emphasize their similarities. Intended for students with a calculus background, the text teaches not only the nuts and bolts of probability theory and how to solve specific problems, but also why the methods of solution work.
Author: David Kushner Publisher: Random House ISBN: 1588362892 Category : Biography & Autobiography Languages : en Pages : 394
Book Description
Masters of Doom is the amazing true story of the Lennon and McCartney of video games: John Carmack and John Romero. Together, they ruled big business. They transformed popular culture. And they provoked a national controversy. More than anything, they lived a unique and rollicking American Dream, escaping the broken homes of their youth to co-create the most notoriously successful game franchises in history—Doom and Quake—until the games they made tore them apart. Americans spend more money on video games than on movie tickets. Masters of Doom is the first book to chronicle this industry’s greatest story, written by one of the medium’s leading observers. David Kushner takes readers inside the rags-to-riches adventure of two rebellious entrepreneurs who came of age to shape a generation. The vivid portrait reveals why their games are so violent and why their immersion in their brilliantly designed fantasy worlds offered them solace. And it shows how they channeled their fury and imagination into products that are a formative influence on our culture, from MTV to the Internet to Columbine. This is a story of friendship and betrayal, commerce and artistry—a powerful and compassionate account of what it’s like to be young, driven, and wildly creative. “To my taste, the greatest American myth of cosmogenesis features the maladjusted, antisocial, genius teenage boy who, in the insular laboratory of his own bedroom, invents the universe from scratch. Masters of Doom is a particularly inspired rendition. Dave Kushner chronicles the saga of video game virtuosi Carmack and Romero with terrific brio. This is a page-turning, mythopoeic cyber-soap opera about two glamorous geek geniuses—and it should be read while scarfing down pepperoni pizza and swilling Diet Coke, with Queens of the Stone Age cranked up all the way.”—Mark Leyner, author of I Smell Esther Williams
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Author: Eugene C. Naumann
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Author: F. Ellyin
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Author: David F. Anderson
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Author: David Kushner