Nonlocal Diffused Approach to Model Delamination in Composites

Pranavi, Dhaladhuli and Rajagopal, Amirtham (2022) Nonlocal Diffused Approach to Model Delamination in Composites. In: 3rd Structural Integrity Conference and Exhibition, SICE 2020, 11 December 2020 through 13 December 2020, Virtual, Online.

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Abstract

Delamination is a critical failure mode in composites as its constituents get separated due to the weakening of the interface between the layers of such composites. Manufacturing defects, sites of stress concentrations, free edge effects are causes for delamination. Upon loading of such composites the delamination can grow and also mitigate between layers, finally leading to the structural failure. In order to assess structural integrity, the material parameters that govern the delamination growth should be determined. In the present work, a nonlocal diffused approach is proposed to model the delamination. Nonlocal approaches help in understanding the complex mechanisms of delamination growth and mitigation and operates at a material length scale. The performance of the proposed formulation is illustrated through representative numerical example. Parametric studies are conducted to understand the role of fiber orientation and the material properties leading to anisotropy. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

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