Modelling of Cyclic Delamination Behavior of Thin Multilayered Structures Using Gradient Elasticity and Damage Accumulation

Martin Lederer; Thomas Walter; Golta Khatibi

doi:10.4028/www.scientific.net/MSF.1016.857

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HomeMaterials Science ForumMaterials Science Forum Vol. 1016Modelling of Cyclic Delamination Behavior of Thin...

Modelling of Cyclic Delamination Behavior of Thin Multilayered Structures Using Gradient Elasticity and Damage Accumulation

Abstract:

Cyclic delamination experiments with multilayered structures were performed in four point bending mode using a central notch for crack initiation. In a preceding study, the propagation of the delaminating cracks could be interpreted on the basis of the Paris law. In order to obtain more insight into the mechanisms of fatigue and crack propagation, FEM simulations of the experiments were conducted. The material models used in the simulation involve strain gradient elasticity, kinematic hardening plasticity and creep. Following the concept of damage mechanics, the crack propagation rate of delamination was related to the inelastic strain accumulated per loading cycle. Thereby, singularities of stresses and strain at the crack tip were suppressed by the regularizing effect of strain gradient elasticity.

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Materials Science Forum (Volume 1016)

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857-862

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https://doi.org/10.4028/www.scientific.net/MSF.1016.857

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Online since:

January 2021

Authors:

Martin Lederer*, Thomas Walter, Golta Khatibi

Keywords:

Damage Accumulation, Delamination Criterion, Mixed Finite Elements, Strain Gradient Elasticity

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