Failure Assessment of Layered Composites Subject to Impact Loadings: a Finite Element, Sigma-Point Kalman Filter Approach

Algorithms

关键词: layered composites;    impact-induced delamination;    Kalman filter;    sigma-point transformation;   

DOI  :  10.3390/a2020808

来源: mdpi

【 摘 要 】

We present a coupled finite element, Kalman filter approach to foresee impact-induced delamination of layered composites when mechanical properties are partially unknown. Since direct numerical simulations, which require all the constitutive parameters to be assigned, cannot be run in such cases, an inverse problem is formulated to allow for modeling as well as constitutive uncertainties. Upon space discretization through finite elements and time integration through the explicit method, the resulting nonlinear stochastic state model, wherein nonlinearities are due to delamination growth, is attacked with sigma-point Kalman filtering. Comparison with experimental data available in the literature and concerning inter-laminar failure of layered composites subject to low-velocity impacts, shows that the proposed procedure leads to: an accurate description of the failure mode; converged estimates of inter-laminar strength and toughness in good agreement with experimental data.

【 授权许可】

CC BY   
© 2009 by the authors; licensee MDPI, Basel, Switzerland.