Download or read book The Creep of Steel at High Temperatures (Classic Reprint) written by F. H. Norton and published by Forgotten Books. This book was released on 2017-12 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Creep of Steel at High Temperatures Above red heat, steel has yielding characteristics not usually associated with it at ordinary temperatures. We do not, as yet, have sufficient information to indicate definitely into which class of solid or fluid flow hot steel belongs. It may be either a plastic solid or a viscous fluid, or combine the properties of both. A viscous fluid, of which pitch is a good example, has the flow characteristics Shown in curve (a) of Fig. 1. The rate of flow is proportional to the load, even down to the smallest values, and yet a great resistance may be Offered against loads acting for a short time. This class of materials has no true elasticity and therefore no yield point. A plastic solid, such as wet clay, has flow characteristics as shown in curve (b) of Fig. 1. Here we have a more complicated condition. Until the load reaches a certain value there is no flow or extension, but after this point is reached the flow increases regularly in proportion to the load in excess of this value. It will be noted that the flow curve does not reach zero at a definite value of load, but approaches the axis gradually. We do not know the exact cause of this departure from a straight line at low flow rates, but it is probably due to the fact that plastic solids are made up of grains or particles of various sizes and shapes and some are less resistant to pressure than others. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.