Constraint effects in ductile fracture on J-resistance curve for full-scale cracked pipes and fracture toughness testing specimens

Jae Jun Han, Yun-Jae Kim, R. A. Ainsworth

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Fracture toughness is an important quantity in structural integrity assessment of pressurised vessels and piping. This paper reports J resistance (J-R) curves for toughness test specimens and full-scale pipes with a circumferential crack in a carbon steel. Full-scale pipes with a circumferential crack subjected to four-point bending are investigated with single edge-notched-tension specimens, SE(T), under fixed grip and pin-loaded conditions and compact tension, C(T), fracture toughness test specimens. Finite element (FE) damage analyses based on a stress-modified fracture strain model are used to simulate ductile fracture. An element-size-dependent critical damage model is introduced and applied to the large-scale components. Fracture parameter J values are calculated using both experimental data and FE analysis. In the first part of this paper, experimental results performed by Battelle Memorial Institute are compared with results from FE simulations to gain confidence in the ductile fracture simulation. Subsequently, different types of fracture toughness tests and thickness variations are considered to address the effect of in-plane and out-of plane constraint, respectively. Also, pipe geometries and crack depth are varied systematically. In conclusion, the transferability of J-R curves from toughness test specimens to full-scale cracked pipes is discussed.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume5
ISBN (Print)9780791846025
DOIs
Publication statusPublished - 2014 Jan 1
EventASME 2014 Pressure Vessels and Piping Conference, PVP 2014 - Anaheim, United States
Duration: 2014 Jul 202014 Jul 24

Other

OtherASME 2014 Pressure Vessels and Piping Conference, PVP 2014
CountryUnited States
CityAnaheim
Period14/7/2014/7/24

ASJC Scopus subject areas

  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Constraint effects in ductile fracture on J-resistance curve for full-scale cracked pipes and fracture toughness testing specimens'. Together they form a unique fingerprint.

  • Cite this

    Han, J. J., Kim, Y-J., & Ainsworth, R. A. (2014). Constraint effects in ductile fracture on J-resistance curve for full-scale cracked pipes and fracture toughness testing specimens. In American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP (Vol. 5). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2014-28903