Influence of microstructural features on the propagation of microstructurally short fatigue cracks in structural steels

M. Sharaf*, J. Lian, N. Vajragupta, S. Münstermann, W. Bleck, B. Schmaling, A. Ma, A. Hartmaier

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Cyclically loaded structural steel components are usually designed to endure macroscopic stress amplitudes close to the material's endurance strength where microcracks initiate due to microstructural inhomogeneities and exhibit strong interactions with the various microstructural features in their neighborhood upon propagating. The current study presents a microstructural model with a capability to quantitatively describe the influence of microstructural features on the growth of cyclic cracks in the decisive, very early fatigue behavior stage. The FE model is based on the crystal plasticity theory and accounts for relative grain orientations. Both the extended finite element method (XFEM) and a coupled damage mechanics approach are used to describe crack opening behavior. The model is implemented to simulate real microcracking events produced in interrupted cyclic multiple-step tests under metallographic observation with temperature change measurements. Furthermore, the model is implemented on virtually created microstructures with altered grain sizes and orientations based on statistical EBSD analysis.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition 2012, MS and T 2012
Pages1409-1416
Number of pages8
Volume2
Publication statusPublished - 1 Dec 2012
MoE publication typeA4 Article in a conference publication
EventMaterials Science & Technology Conference and Exhibition - Pittsburgh, United States
Duration: 7 Oct 201211 Oct 2012

Conference

ConferenceMaterials Science & Technology Conference and Exhibition
CountryUnited States
CityPittsburgh
Period07/10/201211/10/2012

Keywords

  • Defects
  • Endurance strength
  • Fatigue tests
  • Finite elements
  • Short cracks

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