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Many people find the concept of fracture and damage mechanics to be somewhat problematic, mainly because, until recently, close attention in mechanics was focused especially on the strength and resistance of materials. In this sense, to speak of fracture is as uncomfortable for some as it is to speak of a deadly disease. In confronting and preventing a fatal disease, one must understand its complexity, symptoms, and behavior; by the same token, in securing the strength of an engineering structure, one must understand the reasons and type of its potential failure. This book will provide knowledge and insights on this matter to its readers.
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.
Cancer disappearing without trace. A premature baby confounding the medical predictions about his prognosis. A teenager seeing her long-term debilitating illness vanish in an instant. A church receiving cash out of thin air, ensuring it survives the threat of closure. A man defying death, multiple times, following life-threatening injuries sustained in a head-on road collision. Light through the Cracks contains ten true stories, united by a common theme: All of them feature ordinary people encountering God, in extraordinary ways, in the toughest of life's circumstances. Starting with her own dramatic story of the car accident that could have left her dead or paralysed, Joanna Watson writes authentically and compellingly of how God breaks in when life turns tough. Each story raises faith, builds hope, and encourages readers to look for God's Light through the cracks in their own challenging situations.
Cracks and Fracture consists of nine chapters in logical sequence. In two introductory chapters, physical processes in the vicinity of the crack edge are discussed and the fracture process is described. Chapter 3 develops general basic concepts and relations in crack mechanics, such as path independent integrals, stress intensity factors and energy flux into the crack edge region. Chapters 4-7 deal with elastostatic cracks, stationary or slowly moving elastic-plastic cracks, elastodynamic crack mechanics and elastoplastic aspects of fracture, including dynamic fracture mechanics. Appendices include general formulae, the basic theory of analytic functions, introduction to Laplace and Hankel transforms and description of certain basic relations, for instance for stress waves in solids. There is an extensive bibliography, containing references to both classical and recent work, and a comprehensive index. Presents an extensive bibliography containing references to both classical and recent works and a comprehensive index Appendices include general formulas, the basic theory of analytic functions, introduction to Laplace and Hankel transforms, and descriptions of certain basic relations, for instance for stress waves in solids
An “eerie, elliptical masterpiece set in a South African boarding school in the early 1960s. . . . First-rate psychological suspense . . . played out flawlessly” (Kirkus Reviews). The members of an elite girls swim team are the reigning queens at their South African boarding school. And then Italian student Fiamma Coronna joins their ranks. Beautiful, athletic, and suddenly commanding all the coach’s attention, Fiamma is the envy of every girl on the team—until the summer she walks into the rural grasslands surrounding the school and disappears. Forty years later, the former teammates return to the school for a reunion, and the memory of that summer emerges like a long buried secret, the shocking, violent truth of what really happened to Fiamma no longer able to be contained . . . “Riveting . . . while evocative of The Prime of Miss Jean Brodie and Picnic at Hanging Rock, Kohler’s writing is so smoothly confident and erotic that she has produced a tale resonant with a chilling power all its own.” —Elle “A stunning and singular tale of the passion and tribalism of adolescence, Cracks lays bare the violence that lurks in the heart of even the most innocent. Shocking, reminiscent of Lord of the Flies . . . conjures up the wildness of the veld and the passion and drama of adolescence . . . peculiarly satisfying.” —The Times Literary Supplement “A disturbing, note-perfect novel. Dissection of evil has rarely been so extravagantly executed.” —San Francisco Chronicle “Polished, compact and chilling . . . Powerful.” —Publishers Weekly A Library Journal and Newsday Best Book of the Year, now a major motion picture starring Eva Green
In a small Southern town in 1944, two girls secretly help a seriously ill army deserter, a decision that changes their perceptions of right and wrong. Issues of moral ambiguity and accepting consequences for actions are thoughtfully considered in this deftly crafted story.
Growing up in a broken home will always be a rough ride for any child caught in the crossfire. Naturally, when The Light speaks to nine-year-old Demetrius, he is too afraid to tell his bipolar mother what he has seen… However, after young Demetrius develops a secret friendship with The Light, he is taken to “The Other Side,” a metaphysical realm where he meets his ancestors and learns about coping with childhood trauma, domestic abuse, and mental illness. Acclaimed screenwriter John Charles Reedburg presents his latest novel, Cracks of Light, an urban fantasy horror that fuses drama, poetry, and testimony with the spirit world. This book is the first in a series of novels that center on human relationships with the supernatural and appeals to older fans of young adult fiction and genre readers alike. “Raw and lyrical, harrowing, funny, and deeply human, Cracks of Light is a spellbinding novel, a riveting meditation on identity and ancestry. Reedburg is a natural born storyteller, vividly moving back and forth from early 90's South Los Angeles to other dimensions. He confidently takes on a complex plot of mental illness, abuse and addiction, deftly weaving in themes of religion and the supernatural. His voice is a mashup of Stephen King, Walter Mosley, and Charles Dickens, yet distinctly his own, fearlessly telling us Afrofuturist stories that haven’t yet been told.” — Alistair McCartney, author of The Disintegrations. "This raw YA coming-of-age story finds a young boy’s hard upbringing lightened by fantasy." — BookLife by Publishers Weekly "I felt mesmerized by Cracks of Light. I highly recommend it." — Reader's Favorite (5-star review)" "You can't read this story and remain detached." — Advance Reader Copy Reviewer
Local approaches to fatigue assessment are used to predict the structural durability of welded joints, to optimise their design and to evaluate unforeseen joint failures. This standard work provides a systematic survey of the principles and practical applications of the various methods. It covers the hot spot structural stress approach to fatigue in general, the notch stress and notch strain approach to crack initiation and the fracture mechanics approach to crack propagation. Seam-welded and spot-welded joints in structural steels and aluminium alloys are also considered.This completely reworked second edition takes into account the tremendous progress in understanding and applying local approaches which has been achieved in the last decade. It is a standard reference for designers, structural analysts and testing engineers who are responsible for the fatigue-resistant in-service behaviour of welded structures. Completely reworked second edition of a standard work providing a systematic survey of the principles and practical applications of the various methods Covers the hot spot structural stress approach to fatigue in general, the notch stress and notch strain approach to crack initiation and the fracture mechanics approach to crack propagation. Written by a distinguished team of authors
Stella greets Christopher when he shrinks and falls through the cracks in the school floor due to boredom. The two decide to look around and discover some classrooms where children are actively participating in their education and enjoying learning.