Ramberg-Osgood type stress-strain curve estimation using yield and ultimate strengths for failure assessments

摘要

A procedure for estimating true stress-strain curves of the Ramberg-Osgood type was proposed. Only the yield and ultimate strengths are required for the estimation. The estimation procedure was applied to eight materials in order to investigate validity of estimations for assessing structural integrity of cracked pipes. It was shown that the change in failure load derived using the estimated stress strain curves increased as the yield strength was decreased. It was concluded that the change in failure load derived using the proposed procedure could be limited to less than 5%. (C) 2015 Elsevier Ltd. All rights reserved.