Finite element estimation of the plastic η_pl factors for pipe‐ring notched bend specimen using the load separation method

Abstract

ABSTRACT The object of this paper is to develop the load separation method for the new pipe‐ring notched bend specimen. The paper presents an approach for determining the plastic load line displacement ( η pl LLD ) and the plastic crack mouth opening displacement ( η pl CMOD ) correction factors for pipe‐ring notched bend specimens. The estimated plastic factors are possible to use in estimation approach based on load versus displacement test. The η pl factors could be applied for fracture toughness testing of pipeline materials when standard specimens cannot be applied. Finite element method is employed for estimating the separation parameters. The notch tip radius of blunt notched specimens varies within an interval R n = 0, 0.1, 0.25, 0.5, 0.75, 1.25, 1.5 and 2 mm. The effect of the notch tip radius on the η pl factors is analyzed.