Influence of Stitching Parameters on Tensile Strength of Aramid/Vinyl Ester Composites

Abstract

Stitching process is used to provide structural integrity and through-the-thickness reinforcement in the composite materials. In this study, the effect of sewing parameters on tensile strength in stitched composite laminates was examined. In the production of composite laminates, Twaron T-750 type plain weave fabric was used as reinforcement material and a Polives 702 Bisphenol-A type epoxy based vinyl ester as resin. The effects of stitch density and stitch direction or stitch pattern on tensile strength of composite samples were studied and, as a result of the experiments, it was observed that higher tensile strength occurs with low stitch densities in stitched laminates.<p>DOI: <a href="http://dx.doi.org/10.5755/j01.ms.19.1.3829">http://dx.doi.org/10.5755/j01.ms.19.1.3829</a></p

Low Velocity Impact Behaviour of Aramid and UHMWPE Composites

“…Although sample D was composed of woven fabric, the maximum force value was higher than that of the others due to the low crimp on the yarn caused by the thin yarn. It is known that lower crimp amounts result in higher mechanical properties [16,22,23]. Although samples A and B were produced from the same yarn and the mass per unit area was approximately equal, the maximum force value of sample A was 30% higher than that of sample B.…”

Modifying hernia mesh design to improve device mechanical performance and promote tension-free repair

“…We attribute this finding to increased extension deformability and increased extension surface area. To further define how distribution of force over a large surface area enhances anchor point performance, we modified extension stitch pattern and throw count reasoning that these anchoring approaches would significantly improve performance based on textile literature (Karahan et al, 2010; Karahan et al, 2013; Mouritz et al, 1997). We found that all stitch patterns had significantly higher UTS compared to control suture and all significantly exceeded the clinically relevant benchmark of 16 N/cm.…”

Static behavior of three-dimensional ıntegrated core sandwich composites subjected to three-point bending

“…Here L is the span length while P is the applied load. The bending rigidity D for a symmetrical sandwich structure is given in equation (4). Here, the contribution of core material to the modulus can be ignored.…”

“…[1][2][3] The use of 3D integrated fabrics in the production of sandwich composites has presented a new concept on this topic. [4][5][6][7] 3D integrated sandwich fabrics are made by the velvet carpet weaving technique, where two parallel skins (top and bottom skins) are woven together using pile yarns, 6 keeping a defined distance between the skins to form a core. This integrated connection provides a through-the-thickness reinforcement, in which the pile yarn architecture increases the shear rigidity, which is the most significant disadvantage of many core materials.…”