By Edwin P. Alexander
Американские локомотивы 1900-1950
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Extra info for American Locomotives. A Pictorial Record of Steam Power 1900-1950
Cross-linking also influences the properties of polymers. , double bonds) exist between the atoms making up the backbone of the polymer chain that can be broken, allowing individual atoms or molecules to link to adjacent chains. Heavily cross-linked polymers can develop rigid three-dimensional network structures that inhibit interchain sliding, resulting in increased strength and decreased ductility. Structurally, most polymers are amorphous and consist of a random arrangement of molecules, as illustrated in Fig.
F. Knott, Fundamentals of Fracture Mechanics, Butterworths, London, 1981 28. F. Ewing and R. Hill, J. Mech. Phys. Solids, Vol 5, 1957, p 115 29. D. , New York, 1997 30. R. M. Tracey, J. Mech. Phys. Solids, Vol 17, 1969, p 201 31. F. Thomason, Ductile Fracture of Metals, Pergamon Press, Oxford, 1990 32. R. A. F. , McGraw-Hill, New York, 1970, p 641 33. J. R. Rice, Fracture—An Advanced Treatise, H. , Academic Press, New York, 1968, p 191 Introduction to the Mechanical Behavior of Metals Todd M. S.
According to the von Mises criteria, at least five independent slip systems must be available in polycrystalline materials for the material to be capable of plastic deformation. Thus, the greater the number of independent slip systems, the greater is the possibility for plastic deformation. Most technically significant metals and alloys with cubic structures have five or more independent slip systems and thus exhibit substantial plasticity. For example, Ni and Cu, which are fcc metals, each have five independent slip systems and are extremely ductile at ambient temperatures.
American Locomotives. A Pictorial Record of Steam Power 1900-1950 by Edwin P. Alexander