Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

JM Vasco-Olmo; FA Díaz; FV Antunes; MN James

doi:10.1016/j.tafmec.2019.03.009

Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

JM Vasco-Olmo, FA Díaz, FV Antunes, MN James

School of Engineering, Computing and Mathematics

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Abstract

Crack tip opening displacement (CTOD) was measured using digital image correlation (DIC) and resolved into elastic and plastic CTOD components via an offset compliance technique. The plastic CTOD range gave a single linear correlation for fatigue crack growth rate at stress ratios of 0.1 and 0.6 in compact-tension (CT) specimens of Grade 2 titanium. A sensitivity analysis was performed to find the optimum position in the crack wake to make the CTOD measurements. The results are the first time (to the authors knowledge) that plastic CTOD has been found directly from experimentation and demonstrate that plastic CTOD is a useful alternate characterising parameter for fatigue crack growth to the stress intensity factor defined by Irwin.

Original language	English
Pages (from-to)	332-341
Number of pages	0
Journal	Theoretical and Applied Fracture Mechanics
Volume	101
Issue number	0
Early online date	27 Mar 2019
DOIs	https://doi.org/10.1016/j.tafmec.2019.03.009
Publication status	Published - Jun 2019

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10.1016/j.tafmec.2019.03.009

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title = "Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD",

abstract = "Crack tip opening displacement (CTOD) was measured using digital image correlation (DIC) and resolved into elastic and plastic CTOD components via an offset compliance technique. The plastic CTOD range gave a single linear correlation for fatigue crack growth rate at stress ratios of 0.1 and 0.6 in compact-tension (CT) specimens of Grade 2 titanium. A sensitivity analysis was performed to find the optimum position in the crack wake to make the CTOD measurements. The results are the first time (to the authors knowledge) that plastic CTOD has been found directly from experimentation and demonstrate that plastic CTOD is a useful alternate characterising parameter for fatigue crack growth to the stress intensity factor defined by Irwin.",

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AU - Vasco-Olmo, JM

AU - Díaz, FA

AU - Antunes, FV

AU - James, MN

PY - 2019/6

Y1 - 2019/6

N2 - Crack tip opening displacement (CTOD) was measured using digital image correlation (DIC) and resolved into elastic and plastic CTOD components via an offset compliance technique. The plastic CTOD range gave a single linear correlation for fatigue crack growth rate at stress ratios of 0.1 and 0.6 in compact-tension (CT) specimens of Grade 2 titanium. A sensitivity analysis was performed to find the optimum position in the crack wake to make the CTOD measurements. The results are the first time (to the authors knowledge) that plastic CTOD has been found directly from experimentation and demonstrate that plastic CTOD is a useful alternate characterising parameter for fatigue crack growth to the stress intensity factor defined by Irwin.

AB - Crack tip opening displacement (CTOD) was measured using digital image correlation (DIC) and resolved into elastic and plastic CTOD components via an offset compliance technique. The plastic CTOD range gave a single linear correlation for fatigue crack growth rate at stress ratios of 0.1 and 0.6 in compact-tension (CT) specimens of Grade 2 titanium. A sensitivity analysis was performed to find the optimum position in the crack wake to make the CTOD measurements. The results are the first time (to the authors knowledge) that plastic CTOD has been found directly from experimentation and demonstrate that plastic CTOD is a useful alternate characterising parameter for fatigue crack growth to the stress intensity factor defined by Irwin.

U2 - 10.1016/j.tafmec.2019.03.009

DO - 10.1016/j.tafmec.2019.03.009

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JO - Theoretical and Applied Fracture Mechanics

JF - Theoretical and Applied Fracture Mechanics

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ER -

Characterisation of fatigue crack growth using digital image correlation measurements of plastic CTOD

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