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A study on the influence of fatigue damage initiation laws for cohesive zone models in propagation-driven load cases

: May, Michael; Harper, Paul; Hallet, Stephen

Volltext urn:nbn:de:0011-n-4803515 (580 KByte PDF)
MD5 Fingerprint: 46c67c9ca3ae78804ac52142d78ed9df
Erstellt am: 26.1.2018

American Institute of Aeronautics and Astronautics -AIAA-, Washington/D.C.; American Society of Civil Engineers -ASCE-, New York/N.Y.; American Helicopter Society -AHS-; American Society for Composites -ASC-:
AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2018 : 8–12 January 2018, Kissimmee, Florida
Reston, Va.: AIAA, 2018
ISBN: 978-1-62410-532-6
10 S.
Structures, Structural Dynamics and Materials Conference <59, 2018, Kissimmee/Fla.>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer EMI ()

Cohesive zone models for composite laminates considering a Paris-law based damage function for fatigue are well established to model propagation of delamination from existing flaws. However, these models have some limitations in cases without an existing flaw. The limitations occurring in these special cases can be overcome by incorporating SN-curve based damage initiation laws. However, it has not yet been investigated if the combination of different damage models has a strong influence on scenarios with existing pre-cracks, such as typical linear elastic fracture mechanics specimens. Therefore, the 4ENF test is modeled with a propagation-only model and a combined initiation and propagation model. It is shown that the SN-curve based damage initiation model does not affect the Paris-law based damage propagation model negatively.