Mechanical engineerMember of ASTM, Army Materials and Mechanics Research Center, Watertown, MA
One form of the Ramberg-Osgood analytic approximation of the stress-strain curve, which uses the 0.2% offset yield stress as one of the three parameters, has recently been approved for inclusion in Military Standardization Handbook-5. Using the root-mean-square error as a criterion, the fit of this formulation to data from 2357 tension tests of various materials was found to be excellent. In 90% of the tests, the root-mean-square error in stress was less than 1% of the yield stress and in half the tests the error was less than 0.4% of the yield stress.
Paper ID: JTE10264J