Premium
RELATIONSHIPS BETWEEN THE J ‐INTEGRAL AND THE CRACK TIP OPENING DISPLACEMENT FOR STATIONARY CRACKS IN WELDMENTS AT PLASTIC COLLAPSE
Author(s) -
Joch J.,
Ainsworth R. A.
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb01406.x
Subject(s) - welding , materials science , crack tip opening displacement , base metal , tension (geology) , structural engineering , displacement (psychology) , finite element method , crack closure , slip (aerodynamics) , fracture mechanics , composite material , ultimate tensile strength , engineering , psychology , psychotherapist , aerospace engineering
— Slip line field and finite‐element analyses for J and crack tip opening displacement, δ t , at plastic collapse are performed for an idealised weldment. The relationship between these two quantities is shown to depend on the nature of the loading (tension or bending), the ratio of yield stresses in weld and base materials, and on the width of the weld compared to the remaining ligament ahead of the crack. Cases where the weldment behaves as a single weld material are determined. However, it is also shown that there is a significant range of cases where the base material yield stress governs the relationship between J and δ t , at collapse, even when the crack is located in weld metal. It is shown that the relationship between J and δ t , at plastic collapse only occurs at loads very close to the collapse load unless the crack is located close to the weld/base boundary or the weld width is small compared to the remaining ligament ahead of the crack. More generally, the weldment behaves as a single weld material in terms of the relationship between J and δ t , and conventional fracture assessments using J or δ t , are equivalent.