Multiaxial plain and notch fatigue strength of thick-walled ductile cast iron EN-GJS-600-3: Combining multiaxial fatigue criteria, theory of critical distances, and defect sensitivity. (March 2022)

• Record Type: Journal Article
• Authors: Benedetti, Matteo; Santus, Ciro; Raghavendra, Sunil; Lusuardi, Danilo; Zanini, Filippo; Carmignato, Simone
• Is Part Of: International journal of fatigue. Volume 156(2022)
• Publication Date: 2022-03
• Subjects: Notch fatigue -- Multiaxial fatigue -- Defects -- Theory of critical distances -- Ductile cast iron; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2021.106703
• Languages: English
• ISSNs: 0142-1123

Abstract

Graphical abstract: Highlights: Multiaxial fatigue tests on plain and notched samples of pearlitic ductile cast iron. Notch fatigue strength controlled by graphite nodule. Plain fatigue strength controlled by microshrinkage porosity. Different fatigue notch sensitivity under mode I and III loading. Accurate fatigue predictions made by Carpinteri criterion combined with TCD. Abstract: Multiaxial fatigue tests were carried out on plain and notched specimens extracted from EN-GJS-600-3 pearlitic DCI heavy-section castings. Two notches of different severities were combined for the determination of mode I and mode III critical distances, along with the related intrinsic fatigue strengths. SEM and CT clearly showed that fatigue cracks initiated from graphite nodules and shrinkage pores in notched and plain specimens, respectively. Different multiaxial criteria were compared, and best predictions were obtained with the Carpinteri et al. criterion with four parameters: axial and torsional intrinsic fatigue strengths, combined with the two different related critical distances.