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The stress intensity factor at the crack tip of a compact tension specimen is [4] = [() / / + / / + /] where is the applied load, is the thickness of the specimen, is the crack length, and is the effective width of the specimen being the distance between the centreline of the holes and the backface of the coupon.
ASTM International, formerly known as American Society for Testing and Materials, is a standards organization that develops and publishes voluntary consensus technical international standards for a wide range of materials, products, systems and services. Some 12,575 apply globally.
The important characteristic of these tests is that the strain rate is low, for example extension rates selected in the range from 10 −8 to 10 −3 s −1.The selection of the strain rate is very important because the susceptibility to cracking may not be evident from result of tests at too low or too high strain rate.
Created Date: 8/30/2012 4:52:52 PM
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The type of notch introduced to a specimen depends on the material and characterization employed. For standardized testing of fracture toughness by the Charpy impact method, specimen and notch dimensions are most often taken from American standard ASTM E23, or British standard BS EN ISO 148-1:2009.
Website ISO-standard ISO 28079:2009, Palmqvist toughness test The Palmqvist method , or the Palmqvist toughness test , (after Sven Robert Palmqvist ) is a common method to determine the fracture toughness for cemented carbides .
Sponsored free access to the ISO 32000-2 (PDF 2.0) bundle, including the latest core PDF specification and five ISO standardized extensions to the core specification; Format description of the PDF family, PDF/A, PDF/X from Library of Congress; Tech notes from Adobe. Adobe PDF 101: Summary of PDF at the Wayback Machine (archived 2010-10-07)
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