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A New Approach to Alleviating Mesh Size Independence in Multiscale Fatigue Life Prediction in Composites

CAGLAR OSKAY, CHENGZHI TIAN

Abstract


This paper presents a new reduced order multiscale computational methodology for prediction of damage accumulation and failure in composite materials and structures. The proposed reduced order modeling approach relies on the idea of prescribing a finite number of discrete failure paths that can occur within the material microstructure, and tracking the evolution of damage within these failure paths as a function of loading. The key contribution and the novelty of the approach compared to existing and similar formulations is that the failure paths are expressed as surface morphologies, within which the failure is tracked by traction-separation laws, as opposed to unit cell sub-volumes, where the failure is tracked by continuum damage mechanics models. The homogenization and localization operations are performed by employing computational homogenization principles. This paper introduces the formulation of the proposed reduced order modeling approach in the context of a unidirectionally reinforced composite unit cell. The capabilities of the multiscale model in capturing damage propagation and fracture are demonstrated using lamina and laminate configurations including open hole specimens. This paper particularly focuses on the analysis of the approach with regard to mesh sensitivity of damage accumulation when subjected to static and cyclic loading conditions. We demonstrate that the proposed formulation achieves mesh consistency.


DOI
10.12783/asc33/26040

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