Effect of overload on crack closure in thick and thin specimens via digital image correlation

F Yusof; P Lopez-Crespo; P J Withers

doi:10.1016/j.ijfatigue.2013.07.002

Effect of overload on crack closure in thick and thin specimens via digital image correlation

F Yusof, P Lopez-Crespo, P J Withers

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

Abstract

The displacement field of compact tension (CT) specimens have been mapped by digital image correlation (DIC) local to growing fatigue cracks to study overload effects for plane stress and plane strain. We have extracted crack opening displacement (Delta COD) and stress intensity (K) determined by a Muskhelishvili fit to the crack tip displacement field to infer the closure load. In both cases a classical knee was observed upon unloading consistent with closure which disappeared during the accelerated growth following OL, before increasing during retardation. In both cases following OL the crack growth rate is perturbed for a distance similar to the plastic zone. (C) 2013 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	17-24
Number of pages	8
Journal	International Journal of Fatigue
Volume	56
DOIs	https://doi.org/10.1016/j.ijfatigue.2013.07.002
Publication status	Published - 2013

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10.1016/j.ijfatigue.2013.07.002

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abstract = "The displacement field of compact tension (CT) specimens have been mapped by digital image correlation (DIC) local to growing fatigue cracks to study overload effects for plane stress and plane strain. We have extracted crack opening displacement (Delta COD) and stress intensity (K) determined by a Muskhelishvili fit to the crack tip displacement field to infer the closure load. In both cases a classical knee was observed upon unloading consistent with closure which disappeared during the accelerated growth following OL, before increasing during retardation. In both cases following OL the crack growth rate is perturbed for a distance similar to the plastic zone. (C) 2013 Elsevier Ltd. All rights reserved.",

author = "F Yusof and P Lopez-Crespo and Withers, {P J}",

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AU - Yusof, F

AU - Lopez-Crespo, P

AU - Withers, P J

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N2 - The displacement field of compact tension (CT) specimens have been mapped by digital image correlation (DIC) local to growing fatigue cracks to study overload effects for plane stress and plane strain. We have extracted crack opening displacement (Delta COD) and stress intensity (K) determined by a Muskhelishvili fit to the crack tip displacement field to infer the closure load. In both cases a classical knee was observed upon unloading consistent with closure which disappeared during the accelerated growth following OL, before increasing during retardation. In both cases following OL the crack growth rate is perturbed for a distance similar to the plastic zone. (C) 2013 Elsevier Ltd. All rights reserved.

AB - The displacement field of compact tension (CT) specimens have been mapped by digital image correlation (DIC) local to growing fatigue cracks to study overload effects for plane stress and plane strain. We have extracted crack opening displacement (Delta COD) and stress intensity (K) determined by a Muskhelishvili fit to the crack tip displacement field to infer the closure load. In both cases a classical knee was observed upon unloading consistent with closure which disappeared during the accelerated growth following OL, before increasing during retardation. In both cases following OL the crack growth rate is perturbed for a distance similar to the plastic zone. (C) 2013 Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.ijfatigue.2013.07.002

DO - 10.1016/j.ijfatigue.2013.07.002

M3 - Article

VL - 56

SP - 17

EP - 24

JO - International Journal of Fatigue

JF - International Journal of Fatigue

ER -

Effect of overload on crack closure in thick and thin specimens via digital image correlation

Abstract

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