Determination of strain rate dependent through-thickness tensile properties of textile reinforced thermoplastic composites using L-shaped beam specimens

Abstract

The presented work focuses on a methodology to characterise strain rate dependent strength and elastic properties of textile reinforced composites in laminate through-thickness direction. Here, for the characterisation L- ϕ, z, r fibre, fibre and through thickness (TT) direction (specimen coordinate system, bidirectional reinforced textile composites in cylindrical coordinates)

Novel Hybrid Yarn Textile Thermoplastic Composites for Function‐Integrating Multi‐Material Lightweight Design

“…This is made feasible by the use of a complex HYTT preform made partly of near net‐shaped 3D fabrics whose fibers are adapted to the respective loading paths (e.g., those to which the wheelhouses are subjected) . Furthermore, the integration of near net‐shaped shell stringer fabrics ensures the fulfilment of structural criteria while also minimizing weight as described in Mountasir et al Extensive research into the dimensioning of HYTT structures was therefore carried out, thus facilitating the use of novel damage models for HYTT composites to describe complex, non‐linear structural behavior under static and dynamic loading . Those models also made it possible to validate the structural resistance of components such as the bodywork and the adaptive leaf spring.…”

High strain rate compression testing of glass fibre reinforced polypropylene

“…The available data is used to fit a logarithmic strain rate model (for example [3,5,19]), of the form:…”

“…Panels consisting of 25 and 44 plies were manufactured, resulting in nominal panel thicknesses of 12 and 20 mm. The measured density of the GFPP was 1450 kg/m 3 .…”

“…The published strain rate dependent data on GFPP was investigated in detail by Govender [4]. Rate dependency studies of GFPP have been published by Hufenbach et al [3] and Brown et al [5], but these are generally limited to strain rateṡ ε ≤ 10 2 /s. No Split Hopkinson Pressure Bar (SHPB) test data on GFPP has been published to date, which is surprising as the SHPB is the generally accepted means of material testing at high strain rates (ε ≈ 10 2 to 10 4 /s).…”

“…Fibre reinforced polymers (FRP) based on thermoplastics such as polypropylene are being investigated as replacements for thermoset based FRPs, due to the improved toughness and impact resistance of the more ductile matrix (Hufenbach et al [3]). As impact loading is likely in all of the above applications, knowledge of the rate dependent properties of GFPP is of interest to designers.…”