A phenomenological material model for thermoplastic textile composites for crashworthiness simulation combining a stress- and strain-based failure criterion

Textile-reinforced thermoplastics offer a promising lightweight potential for semi-structural parts because of their high specific material and good deep-drawing properties as well as high capability of energy absorption. To realize this potential in an industrial context, appropriate simulation techniques have to be provided. Hence, this paper proposes a new macro-scale model based on different mechanical phenomena on micro-scale. Plasticity as well as damage and failure behavior are discussed in a multi-scale analysis which are then clustered characterizing the matrix- and fiber-dominated domains. The aim of this paper at hand is to model the complex material behavior of textile-reinforced thermoplastic composites phenomenologically on a macroscopic scale while using conventional shell discretization. This offers a good compromise between numerical accuracy and computational efficiency which renders it suitable for industrial crashworthiness simulation. An exemplary experimental characterization of an organic sheet is presented followed by a novel material characterization for the modular material model MF GenYld+CrachFEM. This covers orthotropic elasticity and mesoscopically homogenized plasticity until the onset of fracture by combining a stress- and strain-based criterion.