Experimental methodology for obtaining fatigue crack growth rate curves in mixed-mode I-II by means of variable cyclic displacement tests

•A variable cyclic displacement test methodology applied to MMB is presented.•The linear region of the crack growth rate curve is explored in one single test.•The approach is applicable to any mode mixity.•The crack length is monitored using a dynamic compliance calibration procedure.•The testing ef...

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Bibliographic Details
Published in:International journal of fatigue 2018-05, Vol.110, p.63-70
Main Authors: Jaeck, I., Carreras, L., Renart, J., Turon, A., Martin de la Escalera, F., Essa, Y.
Format: Article
Language:English
Subjects:
Calibration
Compliance calibration
Composite materials
Composites
Crack growth rate
Crack propagation
Delamination
Experimental methods
Fatigue
Fatigue failure
Fatigue tests
Fracture mechanics
Laminates
Materials fatigue
MMB
Monitoring
Testing time
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Summary:•A variable cyclic displacement test methodology applied to MMB is presented.•The linear region of the crack growth rate curve is explored in one single test.•The approach is applicable to any mode mixity.•The crack length is monitored using a dynamic compliance calibration procedure.•The testing effort, in terms of time and required material, is reduced. This work presents a novel procedure to characterize the crack growth rate curve under fatigue mixed mode I + II loading conditions with only one specimen. The procedure is based on applying a variable cyclic displacement during a Mixed Mode Bending (MMB) test together with a real time monitoring of the specimen’s compliance. The method introduces a dynamic compliance calibration for the crack length monitoring that relates the dynamic compliance to the visually obtained crack length using digital recording of the crack tip region during the fatigue test. The testing procedure is validated to be efficient in terms of testing time and required material.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2018.01.016