Fatigue crack growth under non-proportional mixed-mode loading in ferritic-pearlitic steel

V. Doquet; S. Pommier

doi:10.1111/j.1460-2695.2004.00817.x

Fatigue crack growth under non-proportional mixed-mode loading in ferritic-pearlitic steel

V. Doquet
, S. Pommier

Research output: Contribution to journal › Article › peer-review

Abstract

Mode II fatigue crack growth tests as well as tests in sequential mode I and then mode II were performed on ferritic-pearlitic steel. For ΔK_II ranging from 7 to 43 MPa√m, bifurcation occurs after 12-450 μm of coplanar growth at a decreasing speed. By contrast, hundreds of micrometres of constant speed coplanar growth were obtained under sequenfial mode I and then mode II loading, for ΔK_II = 20 MPav/m and ΔK_I ranging from 0.25 to 1.0 ΔK_II. The crack growth rate is a simple sum of the contributions of each mode for ΔK_I = 0.25 ΔK_II but above this value a synergetic effect is found. The mechanism of this fast-propagation mode is discussed in the light of strain range maps ahead of the Crack tip obtained by digital SEM image correlation and elastic-plastic finite element calculations. The stability of the crack path according to the maximum growth rate criterion is demonstrated.

Original language	English
Pages (from-to)	1051-1060
Number of pages	10
Journal	Fatigue and Fracture of Engineering Materials and Structures
Volume	27
Issue number	11
DOIs	https://doi.org/10.1111/j.1460-2695.2004.00817.x
Publication status	Published - 1 Nov 2004
Externally published	Yes

Keywords

Fatigue crack
Friction
Mixed-mode
Non-proportional loading
Steel

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10.1111/j.1460-2695.2004.00817.x

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title = "Fatigue crack growth under non-proportional mixed-mode loading in ferritic-pearlitic steel",

abstract = "Mode II fatigue crack growth tests as well as tests in sequential mode I and then mode II were performed on ferritic-pearlitic steel. For ΔKII ranging from 7 to 43 MPa√m, bifurcation occurs after 12-450 μm of coplanar growth at a decreasing speed. By contrast, hundreds of micrometres of constant speed coplanar growth were obtained under sequenfial mode I and then mode II loading, for ΔKII = 20 MPav/m and ΔKI ranging from 0.25 to 1.0 ΔKII. The crack growth rate is a simple sum of the contributions of each mode for ΔKI = 0.25 ΔKII but above this value a synergetic effect is found. The mechanism of this fast-propagation mode is discussed in the light of strain range maps ahead of the Crack tip obtained by digital SEM image correlation and elastic-plastic finite element calculations. The stability of the crack path according to the maximum growth rate criterion is demonstrated.",

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T1 - Fatigue crack growth under non-proportional mixed-mode loading in ferritic-pearlitic steel

AU - Doquet, V.

AU - Pommier, S.

PY - 2004/11/1

Y1 - 2004/11/1

N2 - Mode II fatigue crack growth tests as well as tests in sequential mode I and then mode II were performed on ferritic-pearlitic steel. For ΔKII ranging from 7 to 43 MPa√m, bifurcation occurs after 12-450 μm of coplanar growth at a decreasing speed. By contrast, hundreds of micrometres of constant speed coplanar growth were obtained under sequenfial mode I and then mode II loading, for ΔKII = 20 MPav/m and ΔKI ranging from 0.25 to 1.0 ΔKII. The crack growth rate is a simple sum of the contributions of each mode for ΔKI = 0.25 ΔKII but above this value a synergetic effect is found. The mechanism of this fast-propagation mode is discussed in the light of strain range maps ahead of the Crack tip obtained by digital SEM image correlation and elastic-plastic finite element calculations. The stability of the crack path according to the maximum growth rate criterion is demonstrated.

AB - Mode II fatigue crack growth tests as well as tests in sequential mode I and then mode II were performed on ferritic-pearlitic steel. For ΔKII ranging from 7 to 43 MPa√m, bifurcation occurs after 12-450 μm of coplanar growth at a decreasing speed. By contrast, hundreds of micrometres of constant speed coplanar growth were obtained under sequenfial mode I and then mode II loading, for ΔKII = 20 MPav/m and ΔKI ranging from 0.25 to 1.0 ΔKII. The crack growth rate is a simple sum of the contributions of each mode for ΔKI = 0.25 ΔKII but above this value a synergetic effect is found. The mechanism of this fast-propagation mode is discussed in the light of strain range maps ahead of the Crack tip obtained by digital SEM image correlation and elastic-plastic finite element calculations. The stability of the crack path according to the maximum growth rate criterion is demonstrated.

KW - Fatigue crack

KW - Friction

KW - Mixed-mode

KW - Non-proportional loading

KW - Steel

UR - https://www.scopus.com/pages/publications/6344221450

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DO - 10.1111/j.1460-2695.2004.00817.x

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SN - 8756-758X

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JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

IS - 11

ER -

Fatigue crack growth under non-proportional mixed-mode loading in ferritic-pearlitic steel

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Keywords

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