Threshold stress intensity factor range of a mechanically-long and microstructually-short crack perpendicular to an interface with plastic mismatch

Bochuan Li, Motomichi Koyama, Shigeru Hamada, Hiroshi Noguchi

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6 Citations (Scopus)

Abstract

In this study, we investigated long fatigue crack growth perpendicular to a soft-hard material interface comprising the same Young's moduli but different yield strengths. We determined the degree of fatigue crack growth retardation attributable to the interface under the constant stress intensity factor range (ΔK) using the plasticity-induced crack closure analysis with the Dugdale model. We subsequently determined the threshold stress intensity factor range (ΔKth) under a constant stress amplitude (σa). Under a constant ΔK, the retardation degree was primary dependent on the two materials’ yield strength ratio. Under a constant σa, ΔKth was dependent on both the yield strength ratio and the distance between initial crack tip and interface.

Original languageEnglish
Pages (from-to)287-302
Number of pages16
JournalEngineering Fracture Mechanics
Volume182
DOIs
Publication statusPublished - Sep 2017

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Stress intensity factors
Yield stress
Plastics
Fatigue crack propagation
Cracks
Crack closure
Crack tips
Plasticity
Elastic moduli

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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author = "Bochuan Li and Motomichi Koyama and Shigeru Hamada and Hiroshi Noguchi",
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T1 - Threshold stress intensity factor range of a mechanically-long and microstructually-short crack perpendicular to an interface with plastic mismatch

AU - Li, Bochuan

AU - Koyama, Motomichi

AU - Hamada, Shigeru

AU - Noguchi, Hiroshi

PY - 2017/9

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AB - In this study, we investigated long fatigue crack growth perpendicular to a soft-hard material interface comprising the same Young's moduli but different yield strengths. We determined the degree of fatigue crack growth retardation attributable to the interface under the constant stress intensity factor range (ΔK) using the plasticity-induced crack closure analysis with the Dugdale model. We subsequently determined the threshold stress intensity factor range (ΔKth) under a constant stress amplitude (σa). Under a constant ΔK, the retardation degree was primary dependent on the two materials’ yield strength ratio. Under a constant σa, ΔKth was dependent on both the yield strength ratio and the distance between initial crack tip and interface.

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