Abstract
The aim of this study is to develop an appropriate modeling methodology for the simulation of intralaminar damage in laminated composites under complex loadings. The intralaminar damages are modeled by stiffness reduction controlled by thermodynamic forces as defined in continuum damage mechanics model proposed by Ladeveze. The original method neglected transverse stress in elementary plies during the tensile tests of [45/?45]mS laminates, resulting in variations of the identified damage parameters of Ladeveze model. This study compared the identified damage parameters considering transverse stress effects with those based on the original method. The effect of transverse stress in the identification process on the damage modeling is discussed, and it is found that one of damage coupling parameters and the damage master curves significantly depend on consideration of transverse stress effects. Finally, it is demonstrated that experimental stiffness degradation is well simulated by the prediction using the identified parameters considering transverse stress effects.
Highlights
Laminated composites are widely used in aerospace and automotive application because of its high specific stiffness and strength
The intralaminar damages are modeled by stiffness reduction controlled by thermodynamic forces as defined in continuum damage mechanics model proposed by Ladevèze
This study compared the identified damage parameters considering transverse stress effects with those based on the original method
Summary
Laminated composites are widely used in aerospace and automotive application because of its high specific stiffness and strength. Gerrit et al 186 tics motivated us to apply the composites to their primary structures. Composites exhibit significant anisotropic mechanical behavior as well as complex damage accumulation process (fiber breakage, fiber/matrix interfacial debonding, microcracks, delaminations, etc.) compared to traditional isotropic metal/polymer materials [1]-[10]. As application-related damage tolerance consideration (e.g. foreign object damages, crashing behavior, and fatigue damages) is required for the design of primary structures, it is necessary to develop a sophisticated but tractable damage simulation tool to express the above-mentioned mechanical and damage behavior of composites
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