On Fracture Mechanics A major objective of engineering design is the determination of the geometry and dimensions of machine or structural elements and the selection of material in such a way that the elements perform their operating function in an efficient, safe and economic manner. For this reason the results of stress analysis are coupled with an appropriate failure criterion. Traditional failure criteria based on maximum stress, strain or energy density cannot adequately explain many structural failures that occurred at stress levels considerably lower than the ultimate strength of the material. On the other hand, experiments performed by Griffith in 1921 on glass fibers led to the conclusion that the strength of real materials is much smaller, typically by two orders of magnitude, than the theoretical strength. The discipline of fracture mechanics has been created in an effort to explain these phenomena. It is based on the realistic assumption that all materials contain crack-like defects from which failure initiates. Defects can exist in a material due to its composition, as second-phase particles, debonds in composites, etc. , they can be introduced into a structure during fabrication, as welds, or can be created during the service life of a component like fatigue, environment-assisted or creep cracks. Fracture mechanics studies the loading-bearing capacity of structures in the presence of initial defects. A dominant crack is usually assumed to exist.
AT the present hour, when fiction takes forms so ingenious and so specious, it is perhaps necessary to say that the following narrative, in all its parts, and so far as the punctilious attention of the writer has been able to keep it so, is scrupulously true. If it were not true, in this strict sense, to publish it would be to trifle with all those who may be induced to read it. It is offered to them as a document, as a record of educational and religious conditions which, having passed away, will never return. In this respect, as the diagnosis of a dying Puritanism, it is hoped that the narrative will not be altogether without significance.
The exhilarating story of a man born into struggle... slogging it out in a time and place where the deadliest terrorist group in the world rained pogrom, a slum born, poverty stricken youngster fighting his way against all odds from the trenches of one of the poorest squalor suburbs in Africa to the stardom of a global celebrity... Enter the life of Eby Razi. This book was inspired by a true life story. How did he do it?... How did he endure thirty four years of inhumanity, cheating death this so many times? How did he go from being a homeless pauper to a billionaire in seven days!? This book was written to inspire you and to convict you to a sober reflection. Read it slowly and let it speak to you... What is impossible with man is not impossible with God.
A fun and funny Halloween romp for children and parents alike!
Falling in love has never been so sweet! John and Kari have spent the last few weeks of their lives falling madly in love for each other, faster than either of them ever dreamed could be possible. A romantic courtship led John to run to Kari's bedside at the hospital when pregnancy complications occurred, and the checkup resulted in a wedding that happened at the hospital! Their untraditional marriage sparked some concern within John's family; his conservative minded mother begged that the couple be wed publically, so that friends and family would be able to join in the celebrations of the couple's joyous union. Kari and John agreed, and are now working day and night, with the help of John's parents, to make their wedding a wondrous event that reflects the love they have for each other. But John's past comes knocking, and things get ugly, quickly. An ex flame proves obsessive and abusive, and claims John is a liar and a cheater who was actually betrothed to her. Kari is shocked and scared; John insists none of this is true. He tells Kari the ex lover is obsessed with him, and is lying; he promises that he never loved the woman, much less promised himself to her. But things grow worse and worse, and more and more complex. The obsessive ex lover not only threatens to drive Kari and John apart- she threatens to end their lives, and after a dreadful display, the couple is wracked with fear. It seems that nothing can be done to keep the ex lover away, and Kari and John become more endangered with each and every day. Will Kari and John be able to pull through the danger, and come out of the storm with their love still intact? Or will this be the end of a short love story, destined for disaster?
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