Fatigue strength assessment of load-carrying cruciform joints with material mismatching in low- and high-cycle fatigue regions based on the effective notch concept

► Specimens were made with various strength mismatch and incomplete penetration. ► Low- and high-cycle fatigue tests were performed on specimens. ► Strength mismatch causes different failure patterns in the low cycle fatigue test. ► Elasto-plastic FEM was performed under the same conditions as the e...

Full description

Saved in:
Bibliographic Details
Published in:International journal of fatigue 2012-07, Vol.40, p.120-128
Main Authors: Saiprasertkit, Kawin, Hanji, Takeshi, Miki, Chitoshi
Format: Article
Language:English
Subjects:
Applied sciences
Effective notch
Exact sciences and technology
Failure pattern
Fatigue
Fatigue failure
High cycle fatigue
Load-carrying cruciform joints
Low cycle fatigue
Low- and high-cycle fatigue
Matching
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Notches
Penetration
Strain
Strength
Strength mismatching
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► Specimens were made with various strength mismatch and incomplete penetration. ► Low- and high-cycle fatigue tests were performed on specimens. ► Strength mismatch causes different failure patterns in the low cycle fatigue test. ► Elasto-plastic FEM was performed under the same conditions as the experiments. ► A unique relationship between effective notch strain and fatigue life was obtained. This study examined the applicability of the effective notch concept to the low- and high-cycle fatigue regions for load-carrying cruciform joints. Low- and high-cycle fatigue tests were performed on specimens with various strength matching conditions and incomplete penetration ratio. Fatigue test results revealed that the effect of strength matching becomes obvious in low cycle fatigue region, while, it was negligible in high cycle fatigue region. Different failure patterns can be observed for specimen with different strength mismatching condition in the low cycle fatigue tests. Elasto-plastic finite element analyses were performed under the same conditions as the experiments. The effective notch strains were determined at the crack initiation points. A unique relationship between effective notch strain and fatigue life was obtained regardless of matching condition and incomplete penetration ratio.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2011.12.016