A modified Paris relation for fatigue delamination with fibre bridging in composite laminates

Journal article (2017)

Authors

L. Yao Northwestern Polytechnical University, Harbin Institute of Technology
Yi Sun Harbin Institute of Technology
Licheng Guo Harbin Institute of Technology
Meiying Zhao Northwestern Polytechnical University
Liyong Jia AVIC the First Aircraft Institute
R.C. Alderliesten Structural Integrity & Composites - Aerospace Engineering
R. Benedictus Aerospace Structures & Materials
Research Group
Structural Integrity & Composites (Aerospace Engineering) (TU Delft)
Fatigue Delamination Composites Fibre bridging
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Published Date

15-09-2017

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Structural Integrity & Composites

Abstract

The aim of present research is to determine fatigue delamination with fibre bridging in composite laminates. Both the Paris relation and the Hartman-Schijve equation were employed to explore fatigue delamination behavior. The use of the Paris relation can result in fatigue delamination growth being crack scale dependent. This dependence was significantly reduced in case of using the Hartman-Schijve relation in data reduction. This difference can lead to controversies on fatigue delamination behavior in composite laminates. To address this dispute, a new parameter, which was consistent with the hypothesis of similitude as well as damage mechanisms, was introduced to represent the similitude in fatigue delamination growth. A modified Paris relation based on this parameter was proposed and used to determine fatigue delamination. And a master resistance curve was obtained to determine fatigue delamination growth with different amounts of fibre bridging. Thus, fatigue delamination is crack scale independent, if the similitude is well characterized. And in the Paris region, the modified Paris relation can provide good predictions in fatigue delamination growth with fibre bridging.