Master curve approach to axial stiffness calculation for non-crimp fabric biaxial composites with out-of-plane waviness

作者：Zrida H; Marklund E; Ayadi Z; Varna J^*

来源：Composites Part B: Engineering , 2014, 64: 214-221.

DOI：10.1016/j.compositesb.2014.04.023

• Tow
• Polymer-matrix composites (PMCs)
• Mechanical properties
• Laminate mechanics
• Finite element analysis (FEA)

The effect of 0 degrees-tow out-of-plane waviness on the biaxial non-crimp-fabric (NCF) composite axial stiffness is investigated. Homogenizing, the bundle mesostructure of the NCF composite is replaced by layers. Then the composite is represented by a laminate with flat layers with effective stiffness properties representing the curved 0 degrees-layer and the 90 degrees-layer with varying thickness. It is shown that the NCF composite knock-down factor characterizing the stiffness degradation has almost the same dependence on wave parameters as the knock-down factor for the curved 0 degrees-layer. Numerical analysis showed that 90 degrees-layer knock-down factor versus amplitude curves for different wavelength can be reduced to one master curve which can be described by a one-parameter expression with the parameter dependent on the used material. This observation is used to obtain high accuracy for analytical predictions for knock-down factors for cases with different wavelength and amplitudes based on two FE calculations only.

• 出版日期2014-8