Utilizing numerical models to identify process-induced residual stresses in 3D woven carbon/epoxy composites

13th International Conference on Textile Composites

Tsukrov, Igor^1 ; Vasylevskyi, Kostiantyn^1 ; Drach, Borys^2 ; Buntrock, Hilary^1 ; Gross, Todd^1

University of New Hampshire, Durham

NH

03861, United States^1

New Mexico State University, Las Cruses

NM

88003, United States^2

关键词: Carbon/epoxy composites;    Digital image correlations;    Effective temperature;    Electronic speckle pattern interferometry;    Finite element simulations;    Meso-scale finite element models;    Numerical procedures;    Thermal expansion coefficients;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/406/1/012030/pdf
DOI  :  10.1088/1757-899X/406/1/012030

来源: IOP

【 摘 要 】

A combined experimental-numerical procedure is proposed to evaluate residual stresses in 3D woven carbon/epoxy composites. It is assumed that residual stresses are caused by the difference in thermal expansion coefficients of the constituents. The impact of residual stresses is quantified by drilling blind holes in the composite panels and mapping the resulting in-plane surface displacements by digital image correlation and electronic speckle pattern interferometry. Then mesoscale finite element models of the composite are used to determine the effective temperature drop ΔTeff that results in the same predictions for hole drilling. The local distributions of residual stress are given by the finite element simulations of the cooling by this temperature drop ΔTeff