Title: Defect assessment for pressure vessels considering crack growth and strain hardening

Authors: Yu Shou Wen, Yang Wei, Dong Ya Min

Addresses: Qinghua University, Beijing, China. ' Qinghua University, Beijing, China. ' Qinghua University, Beijing, China

Abstract: In this paper, a simple approach distinguished with the EPRI assessment method is deduced. We suggest a demarcating curve for the infinite plate containing a crack considering the strain hardening effect. The double parameters assessment criteria according to the parameter øc, for crack initiation and the tearing modulus Tc, considered the crack growth are proposed to describe the two different modes of failure for the pressure vessels. The transformed formula of the relationship between the COD for the original crack tip and the δt suggested by Rice are introduced. We deduced a theoretical curve for the fracture resistance of materials with strain hardening and then the instability condition of cracked body connected to the double parameters method are discussed.

Keywords: cracks; crack growth; crack initiation; defect assessment; fracture resistance; pressure vessels; strain hardening; tearing modulus; failure modes.

DOI: 10.1504/IJMPT.1989.036720

International Journal of Materials and Product Technology, 1989 Vol.4 No.1, pp.35 - 42

Published online: 06 Nov 2010 *

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