Portland cement concrete is a relatively brittle material. As a result, mechanical behavior of concrete, conventionally reinforced concrete, prestressed concrete, and fiber reinforced concrete is critically influenced by crack propagation. It is, thus, not surprising that attempts are being made to apply the concepts of fracture mechanics to quantify the resistance to cracking in cementious composites. The field of fracture mechanics originated in the 1920's with A. A. Griffith's work on fracture of brittle materials such as glass. Its most significant applications, however, have been for controlling brittle fracture and fatigue failure of metallic structures such as pressure vessels, airplanes, ships and pipe- lines. Considerable development has occurred in the last twenty years in modifying Griffith's ideas or in proposing new concepts to account for the ductility typical of metals. As a result of these efforts, standard testing techniques have been available to obtain fracture parameters for metals, and design based on these parameters are included in relevant specifications. Many attempts have been made, in the last two decades or so, to apply the fracture mechanics concepts to cement, mortar, con- crete and reinforced concrete. So far, these attempts have not led to a unique set of material parameters which can quantify the resistance of these cementitious composites to fracture. No standard testing methods and a generally accepted theoretical analysis are established for concrete as they are for metals.
By the FBI's accounting, Wittman saved hundreds of millions of dollars worth of art and antiquities. He says the statistic isn't important. After all, who's to say what is worth more --a Rembrandt self-portrait or an American flag carried into battle? They're both priceless. When Navy SEAL Adam Brown woke up on March 17, 2010, he didn t know he would die that night in the Hindu Kush Mountains of Afghanistan but he was ready: In a letter to his children, not meant to be seen unless the worst happened, he wrote, I m not afraid of anything that might happen to me on this earth, because I know no matter what, nothing can take my spirit from me. This is the second novel, alongside 'The Soft Machine' and 'Nova Express', in William Burroughs' classic 'Cut-Up Trilogy'. A prophetic vision of a world in which technology has gone haywire, 'The Ticket That Exploded' continues the adventures of Agent Lee in his mission to investigate and subvert the methods of mind control being used by The Nova Mob. Experimental, unnerving and compelling in equal measure, this is a completely original work of science fiction and a gripping Interconnecting Issues of Pv/Wind Hybrid System with Electric Utility free pdf moral and political fable from post-war America's most controversial and influential writer.
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Author: S. P. Shah
Number of Pages: 732 pages
Published Date: 06 Oct 2011
Publisher: Springer
Publication Country: Dordrecht, Netherlands
Language: English
ISBN: 9789401087643
Download Link: Click Here
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