Study on the in-plane shear performance of spacer fabrics in composite forming
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Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
IMPOL Slovenska bistrica
Abstract
Shear properties are important not only for standard fabrics but for textile-reinforced composites as well. Shear is one of the
most common flaws that occurs during textile-composite-reinforcement forming processes. To ensure the production of
high-quality textile-fabric-reinforced composites when forming complex shapes, the potential for an in-plane deformation of the
fabric reinforcement must be taken into consideration. This research paper will present the emerging textile fabric of this
decade, commonly known as the 3D spacer fabric, which could be used as the reinforcement for complex-shaped composites.
The objective of this research was to study the shear behavior of 3D knitted spacer fabrics using a picture-frame fixture. The
images acquired during the loading process were used for an analysis in order to obtain a full-field displacement and shear
angles at the chosen points on the surface of a test specimen. To determine its suitability for measuring the in-plane shear
properties of the 3D knitted spacer fabrics, experimental and analytical investigations of the picture-frame shear fixture were
conducted. The non-linear behavior of the shear force versus the shear angle and deformation mechanism were analyzed.
Load-displacement curves of intra-ply shear tests were also analyzed. In addition, a MATLAB program was developed, using
the Hough transform to analyze the shear angle in the real-time image taken during the displacement of the specimen at various
positions. The image-analysis results were compared with the actual experimental results. These findings are important
requirements when using 3-dimensional textile fabrics as the reinforcement in a composite formation.
Description
Subject(s)
3D spacer fabrics Image analysis Shear deformation Shear stress
Citation
ISSN
1580-2949