A quantitative evaluation of fatigue crack shielding forces using photoelasticity

C. J. Christopher; M. N. James; E. A. Patterson; K. F. Tee

doi:10.1016/j.engfracmech.2008.03.013

A quantitative evaluation of fatigue crack shielding forces using photoelasticity

C. J. Christopher
, M. N. James^*
, E. A. Patterson
, K. F. Tee

^*Corresponding author for this work

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

64 Scopus citations

Abstract

The mechanisms controlling the phenomenon of plasticity-induced shielding during fatigue are investigated and quantified by fitting a recently developed model to photoelastic data. The model derives from the Muskhelishvili approach and includes additional terms to describe the effect of plasticity on the elastic stress field around the crack tip. The photoelastic technique used a polycarbonate CT specimen containing a naturally propagating fatigue crack from which full-field data was obtained digitally using the phase-stepping method. The model was fitted to approximately 1000 data values for the isochromatic fringe order around the crack tip and generated values for the stress intensity factor and T-stress plus an interfacial shear stress intensity factor and a retardation intensity factor which together characterize the influence of plasticity on crack growth.

Original language	English
Pages (from-to)	4190-4199
Number of pages	10
Journal	Engineering Fracture Mechanics
Volume	75
Issue number	14
DOIs	https://doi.org/10.1016/j.engfracmech.2008.03.013
State	Published - Sep 2008
Externally published	Yes

Keywords

Crack closure
Crack shielding
Fracture mechanics
Photoelasticity
Plasticity
Stress intensity factor

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.engfracmech.2008.03.013

Cite this

@article{4c38853edda34a31915766a4497c48e6,

title = "A quantitative evaluation of fatigue crack shielding forces using photoelasticity",

abstract = "The mechanisms controlling the phenomenon of plasticity-induced shielding during fatigue are investigated and quantified by fitting a recently developed model to photoelastic data. The model derives from the Muskhelishvili approach and includes additional terms to describe the effect of plasticity on the elastic stress field around the crack tip. The photoelastic technique used a polycarbonate CT specimen containing a naturally propagating fatigue crack from which full-field data was obtained digitally using the phase-stepping method. The model was fitted to approximately 1000 data values for the isochromatic fringe order around the crack tip and generated values for the stress intensity factor and T-stress plus an interfacial shear stress intensity factor and a retardation intensity factor which together characterize the influence of plasticity on crack growth.",

keywords = "Crack closure, Crack shielding, Fracture mechanics, Photoelasticity, Plasticity, Stress intensity factor",

author = "Christopher, \{C. J.\} and James, \{M. N.\} and Patterson, \{E. A.\} and Tee, \{K. F.\}",

year = "2008",

month = sep,

doi = "10.1016/j.engfracmech.2008.03.013",

language = "English",

volume = "75",

pages = "4190--4199",

journal = "Engineering Fracture Mechanics",

issn = "0013-7944",

publisher = "Elsevier B.V.",

number = "14",

}

TY - JOUR

T1 - A quantitative evaluation of fatigue crack shielding forces using photoelasticity

AU - Christopher, C. J.

AU - James, M. N.

AU - Patterson, E. A.

AU - Tee, K. F.

PY - 2008/9

Y1 - 2008/9

N2 - The mechanisms controlling the phenomenon of plasticity-induced shielding during fatigue are investigated and quantified by fitting a recently developed model to photoelastic data. The model derives from the Muskhelishvili approach and includes additional terms to describe the effect of plasticity on the elastic stress field around the crack tip. The photoelastic technique used a polycarbonate CT specimen containing a naturally propagating fatigue crack from which full-field data was obtained digitally using the phase-stepping method. The model was fitted to approximately 1000 data values for the isochromatic fringe order around the crack tip and generated values for the stress intensity factor and T-stress plus an interfacial shear stress intensity factor and a retardation intensity factor which together characterize the influence of plasticity on crack growth.

AB - The mechanisms controlling the phenomenon of plasticity-induced shielding during fatigue are investigated and quantified by fitting a recently developed model to photoelastic data. The model derives from the Muskhelishvili approach and includes additional terms to describe the effect of plasticity on the elastic stress field around the crack tip. The photoelastic technique used a polycarbonate CT specimen containing a naturally propagating fatigue crack from which full-field data was obtained digitally using the phase-stepping method. The model was fitted to approximately 1000 data values for the isochromatic fringe order around the crack tip and generated values for the stress intensity factor and T-stress plus an interfacial shear stress intensity factor and a retardation intensity factor which together characterize the influence of plasticity on crack growth.

KW - Crack closure

KW - Crack shielding

KW - Fracture mechanics

KW - Photoelasticity

KW - Plasticity

KW - Stress intensity factor

UR - https://www.scopus.com/pages/publications/44549088860

U2 - 10.1016/j.engfracmech.2008.03.013

DO - 10.1016/j.engfracmech.2008.03.013

M3 - Article

AN - SCOPUS:44549088860

SN - 0013-7944

VL - 75

SP - 4190

EP - 4199

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

IS - 14

ER -

A quantitative evaluation of fatigue crack shielding forces using photoelasticity

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this