Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 92, Issue -, Pages 470-477Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.02.042
Keywords
Shear loading modes; Local mode II; Growth mechanism; 3D crack path; Coplanar growth
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The paper is focused on an identification of the local mode II mechanism of fatigue cracks loaded under the remote mode III and the mixed mode II + III and presents a convincing experimental evidence of such a mechanism in materials with a nearly coplanar crack growth. Closure-free data were obtained by applying fatigue experiments in modes II, III and II + III in commercially pure titanium and niobium. The results revealed that the micromechanism of propagation of all kinds of shear-mode cracks can be described by a common model of advances of local mode II crack segments nearly in the direction of applied shear stress. These segments nucleated at spatial geometrical irregularities of the precrack front generating fibrous patterns at fracture surfaces. (C) 2016 Elsevier Ltd. All rights reserved.
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