Fatigue crack propagation of coplanar semi-elliptical cracks in pure bending

W. O. Soboyejo; J. F. Knott; M. J. Walsh; K. R. Cropper

doi:10.1016/0013-7944(90)90044-H

Fatigue crack propagation of coplanar semi-elliptical cracks in pure bending

W. O. Soboyejo
, J. F. Knott
, M. J. Walsh
, K. R. Cropper

President

SUNY Polytechnic Institute

University of Cambridge
Rolls-Royce

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

80 Scopus citations

Abstract

The first part of this paper presents stress intensity factor solutions for coalescing coplanar semi-elliptical cracks subjected to pure bending. Crack shapes of "beachmarked" test pieces were modelled using a finite element method and stress intensity factors were obtained using an elastic strain energy method and a displacement extrapolation method. The second part presents the results of an experimental investigation of the fatigue propagation of coplanar semi-elliptical cracks. Fatigue tests were carried out for stress ratios of 0.2, 0.5, and 0.7, and for initial crack separations of 4 mm, 8 mm, and 16 mm. In part III various models are employed for the prediction of fatigue crack growth of coalescing coplanar cracks. The implications for fatigue life assessment are discussed.

Original language	English
Pages (from-to)	323-340
Number of pages	18
Journal	Engineering Fracture Mechanics
Volume	37
Issue number	2
DOIs	https://doi.org/10.1016/0013-7944(90)90044-H
State	Published - 1990

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10.1016/0013-7944(90)90044-H

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title = "Fatigue crack propagation of coplanar semi-elliptical cracks in pure bending",

abstract = "The first part of this paper presents stress intensity factor solutions for coalescing coplanar semi-elliptical cracks subjected to pure bending. Crack shapes of {"}beachmarked{"} test pieces were modelled using a finite element method and stress intensity factors were obtained using an elastic strain energy method and a displacement extrapolation method. The second part presents the results of an experimental investigation of the fatigue propagation of coplanar semi-elliptical cracks. Fatigue tests were carried out for stress ratios of 0.2, 0.5, and 0.7, and for initial crack separations of 4 mm, 8 mm, and 16 mm. In part III various models are employed for the prediction of fatigue crack growth of coalescing coplanar cracks. The implications for fatigue life assessment are discussed.",

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T1 - Fatigue crack propagation of coplanar semi-elliptical cracks in pure bending

AU - Soboyejo, W. O.

AU - Knott, J. F.

AU - Walsh, M. J.

AU - Cropper, K. R.

PY - 1990

Y1 - 1990

N2 - The first part of this paper presents stress intensity factor solutions for coalescing coplanar semi-elliptical cracks subjected to pure bending. Crack shapes of "beachmarked" test pieces were modelled using a finite element method and stress intensity factors were obtained using an elastic strain energy method and a displacement extrapolation method. The second part presents the results of an experimental investigation of the fatigue propagation of coplanar semi-elliptical cracks. Fatigue tests were carried out for stress ratios of 0.2, 0.5, and 0.7, and for initial crack separations of 4 mm, 8 mm, and 16 mm. In part III various models are employed for the prediction of fatigue crack growth of coalescing coplanar cracks. The implications for fatigue life assessment are discussed.

AB - The first part of this paper presents stress intensity factor solutions for coalescing coplanar semi-elliptical cracks subjected to pure bending. Crack shapes of "beachmarked" test pieces were modelled using a finite element method and stress intensity factors were obtained using an elastic strain energy method and a displacement extrapolation method. The second part presents the results of an experimental investigation of the fatigue propagation of coplanar semi-elliptical cracks. Fatigue tests were carried out for stress ratios of 0.2, 0.5, and 0.7, and for initial crack separations of 4 mm, 8 mm, and 16 mm. In part III various models are employed for the prediction of fatigue crack growth of coalescing coplanar cracks. The implications for fatigue life assessment are discussed.

UR - https://www.scopus.com/pages/publications/0025682604

U2 - 10.1016/0013-7944(90)90044-H

DO - 10.1016/0013-7944(90)90044-H

M3 - Article

SN - 0013-7944

VL - 37

SP - 323

EP - 340

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

IS - 2

ER -

Fatigue crack propagation of coplanar semi-elliptical cracks in pure bending

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