NEW VERSION OF CHARPY MACHINE GUIDE IS NOW AVAILABLE.Featuring a new "ready-for-the-workplace" format, the latest version of the NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. guide for the use of Charpy impact testing The Charpy impact test is a standardized high strain-rate test which determines the amount of energy absorbed by a material during fracture. This absorbed energy is a measure of a given material's toughness and acts as a tool to study brittle-ductile transition. machines is now available. The previous edition (NIST Technical Note 1500-8) was announced last year (see the NIST Update issue of May 22, 2000, at www.nist.gov/update/upd000522.htm). Charpy machines, based on the swing of a pendulum, are used to determine the temperature at which structural materials Structural materials Construction materials which, because of their ability to withstand external forces, are considered in the design of a structural framework. Brick is the oldest of all artificial building materials. go through a ductile-to-brittle transition. Charpy impact testing is often specified as an acceptance test for materials used in critical structures such as bridges and pressure vessels Pressure vessel A cylindrical or spherical metal container capable of withstanding pressures exerted by the material enclosed. Pressure vessels are important because many liquids and gases must be stored under high pressure. . As with NIST TN 1500-8, the new version of the guide--recast as a NIST Recommended Practice Guide (NIST Special Publication 960-4)--explains how engineers and technicians can install, maintain and verify their Charpy impact testing machines. What makes the new publication special is its improved formatting. Featured are a smaller, easier-to-handle size and a more durable glossy gloss·y adj. gloss·i·er, gloss·i·est 1. Having a smooth, shiny, lustrous surface: glossy satin. See Synonyms at sleek. 2. hard cover so that the guide can be kept near the Charpy machine and used repeatedly. For a free copy of the Practice Guide, contact Sarabeth Harris, NIST, MC 104, Boulder, CO 80305-3328; (303) 497-3237; sarabeth@boulder.nist.gov. |
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