Analysis of thermoplastic prepreg bending stiffness during manufacturing and of its influence on wrinkling simulations

Towards comprehensive characterisation and modelling of the forming and wrinkling mechanics of engineering fabrics

“…The test method was discussed recently in Harrison (2016) and is expected to provide an accuracy of around 0.3% per cent for the curvature created during the test. Note that the bending stiffness of engineering fabrics tends to decrease with increasing curvature (de Bilbao et al, 2010;Liang et al, 2014;Lomov et al, 2003) nevertheless, a single value for each fibre direction is sufficient for the purpose of this investigation.…”

“…For example, the tensile modulus of woven fabrics is influenced by crimpinterchange, e.g. (Boisse et al, 2001;Potluri and Thammandra, 2007), and the out-of-plane bending modulus of engineering textiles is known to be a function of bending curvature (de Bilbao et al, 2010;Liang et al, 2014;Lomov et al, 2003). Methods of including non-linearity in the bending behaviour are possible, for example, the transverse modulus of the beam elements could perhaps be linked to the curvature of the beam.…”

Bending characterisation of a molten unidirectional carbon fibre reinforced thermoplastic composite using a Dynamic Mechanical Analysis system

“…Until recently, all variants of cantilever tests were only suitable for tests performed at room temperature. In 2014, Liang et al proposed an adaptation within an environmental thermal chamber [29]. Investigations proved the method to be applicable to the characterisation of thermoplastic composites through a control of the testing temperature.…”

“…In a latter study, Haanappel et al indicated that an increasing bending stiffness leads to a reduction of the number of wrinkles [20]. Correlations between the material bending stiffness and the shape, the size and the quantity of wrinkles have also been recently made by Liang et al [29].…”

Effects of thermal residual stress on interfacial properties of polyphenylene sulphide/carbon fibre (PPS/CF) composite by microbond test

“…Continuous fibre-reinforced thermoplastic matrix composites have been increasingly used as structural components in aerospace and automotive industries mainly due to their excellent toughness, weldability, infinite storage life and superior chemical resistance [1][2][3][4]. Economic benefits such as recyclability and time-saving production processes compared to thermosets also make thermoplastics the preferred matrix resins for many fibre composites.…”