Tensile extension properties and deformation mechanisms of multiaxial non-crimp fabrics

Analyses of the Deformation Mechanisms of Non-Crimp Fabric Composite Reinforcements during Preforming

“…More specifically, concerning the experimental study of draping ability of NCF reinforcements, [10] presents the deformation mechanisms, including tensile tests and bias extension tests. The deformation modes of this type of reinforcement are compared with those of woven reinforcements, analyzing the role of the stitches.…”

Modelling the deformability of biaxial non-crimp fabric composites

“…The unique fabric architecture of biaxial NCFs results in deformation mechanisms (see also Chapters 6 , 8 and 16 ) particular to these materials (Long et al , 2002;Wiggers et al , 2003;Thije et al , 2003;2005a;2005b;2007;Harrison et al , 2004a;Kong et al , 2004;Creech et al , 2003;Creech and Pickett, 2006). As with woven fabrics, micro-mechanisms include fi bre-fi bre interactions within the tows during both tow compaction (in-plane and through-thickness) and intra-tow in-plane shear.…”

“…Recent advances in computational power coupled with the complexity and rewards in determining ideal manufacturing solutions have motivated the development of computer-aided engineering (CAE) tools aimed at creating a virtual try-out space for the manufacture of textile composites. While some experimental characterisation work on the forming of multiaxial (triaxial) non-crimp fabrics (NCFs) has been published (Kong et al , 2004), to the best of the authors' knowledge, all modelling work published so far has been limited to biaxial NCFs and consequently provides the focus of work reviewed in this chapter.…”

Experimental study on the bending properties and failure mechanism of 3D MWK composites at elevated temperatures

“…Their results showed the layer stacking sequence has little influence on the initial stiffness of the material, but large influences were found on the stiffness evolution during the test. Kong et al [8] observed that the rotation, sliding and compaction of the tows causes the deformation of biaxial and triaxial non-crimp fabrics under bias extension loading and the resistance to bias deformation was dependent on the density, line-tension and location of the warp knitted stitches. Edgren et al [9,10] developed an analytical constitutive model for MWK composites and focused on the formation and development of the damage, founding longitudinal and transverse cracks developed under tensile loading and revealing stress concentrations caused by 0 o fiber bundle waviness.…”