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A toughness based deformation limit for fatigue-cracked X-joints under in-plane bending
https://orcid.org/0000-0002-6183-256X
Abstract This study reports a deformation limit for the initiation of ductile fracture failure in fatigue-cracked circular hollow section (CHS) X-joints subjected to brace in-plane bending. The proposed approach sets the deformation limit as the calculated crack driving force in a fatigue crack at the hot-spot location in the tubular joint reaches the material fracture toughness measured from standard fracture specimens. The calibration of the proposed approach and the numerical procedure utilizes two large-scale X-joint specimens with fatigue generated surface cracks. The subsequent numerical investigation covers X-joints with two different brace-to-chord intersection angles, a wide range of geometric parameters and a practical range of material parameters. The development of the deformation limit includes a non-dimensional material toughness, which covers both the geometric parameters and material properties. The lower-bound deformation limit thus developed exhibits a linear relationship with respect to the crack depth ratio and indicates consistent values among X-joints with different brace-to-chord intersection angles.
Highlights We propose a design deformation parameter based on the fracture toughness. The proposed critical deformation covers wide geometric and material parameters. The lower-bound deformation remains linear with respect to crack-depth ratios.
A toughness based deformation limit for fatigue-cracked X-joints under in-plane bending
https://orcid.org/0000-0002-6183-256X
Abstract This study reports a deformation limit for the initiation of ductile fracture failure in fatigue-cracked circular hollow section (CHS) X-joints subjected to brace in-plane bending. The proposed approach sets the deformation limit as the calculated crack driving force in a fatigue crack at the hot-spot location in the tubular joint reaches the material fracture toughness measured from standard fracture specimens. The calibration of the proposed approach and the numerical procedure utilizes two large-scale X-joint specimens with fatigue generated surface cracks. The subsequent numerical investigation covers X-joints with two different brace-to-chord intersection angles, a wide range of geometric parameters and a practical range of material parameters. The development of the deformation limit includes a non-dimensional material toughness, which covers both the geometric parameters and material properties. The lower-bound deformation limit thus developed exhibits a linear relationship with respect to the crack depth ratio and indicates consistent values among X-joints with different brace-to-chord intersection angles.
Highlights We propose a design deformation parameter based on the fracture toughness. The proposed critical deformation covers wide geometric and material parameters. The lower-bound deformation remains linear with respect to crack-depth ratios.
A toughness based deformation limit for fatigue-cracked X-joints under in-plane bending
https://orcid.org/0000-0002-6183-256X
Abstract This study reports a deformation limit for the initiation of ductile fracture failure in fatigue-cracked circular hollow section (CHS) X-joints subjected to brace in-plane bending. The proposed approach sets the deformation limit as the calculated crack driving force in a fatigue crack at the hot-spot location in the tubular joint reaches the material fracture toughness measured from standard fracture specimens. The calibration of the proposed approach and the numerical procedure utilizes two large-scale X-joint specimens with fatigue generated surface cracks. The subsequent numerical investigation covers X-joints with two different brace-to-chord intersection angles, a wide range of geometric parameters and a practical range of material parameters. The development of the deformation limit includes a non-dimensional material toughness, which covers both the geometric parameters and material properties. The lower-bound deformation limit thus developed exhibits a linear relationship with respect to the crack depth ratio and indicates consistent values among X-joints with different brace-to-chord intersection angles.
Highlights We propose a design deformation parameter based on the fracture toughness. The proposed critical deformation covers wide geometric and material parameters. The lower-bound deformation remains linear with respect to crack-depth ratios.
A toughness based deformation limit for fatigue-cracked X-joints under in-plane bending
Ahmed, Aziz (Autor:in) / Qian, Xudong (Autor:in)
Marine Structures ; 42 ; 33-52
09.03.2015
20 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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