Damage mechanism of Woven Fabric Composite Model

The geometrical model of two dimensional woven structures was developed with finite element analysis pre-processor tools. The model was assumed to be in lenticular cross section,monofilament and possessed aramid yarn property.

 

The matrix was assumed to be elastic isotropic and yarn as transverse isotropic, a subset of orthotropic. Shear failure model was chosen as failure criterion. Generally, it would be seen that 2Dwoven composite damage mechanism is largely influenced by yarn damage behaviour. Necking and yielding effects were observed as damage failure initiated. Matrix deformations initiated when damaged elements were removed from finite element computation. At this stage, matrix elements were considered failed and matrix started to transfer its load to yarns. This effect was magnified as yarns model is extracted from matrix model as in plate (c), and (d). At this stage, almost 90% matrix elements had failed and warp yarns were responding to the uniaxial tension. Stresses were distributed from loading to boundary condition zone. Here, warp yarns were further stretched and finally broken once it’s reached it ability to resist uniaxial tensile. From the model, damage mechanism for composite was largely influenced by higher modulus yarn strength rather than matrix. The following figures illustrate woven fabric composite damage phases. Researcher : Mohamad Faizul Yahya, Textile Modelling and Simulation RIG

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