Stiffness Analysis on Composite Materials Based on Tsai's Modulus
The anisotropy and layered stacking characteristics of composite materials require more engineering constant inputs and stiffness equivalent calculations compared to metal materials in the analysis process,which brings greater difficulty and computational complexity to the design and analysis on composite materials.The introduction of the Tsai's modulus provides a new approach for simplifying the analysis on composite laminated structures.This paper summarizes the concepts and methods of Tsai's modulus,average principal stiffness,thickness normalization,and Trace normalization.Through graded statistics of different material properties,virtual unidirectional lamina and principal carpet plot with certain engineering universality are defined,and the similarity of normalized stiffness of carbon fiber composite materials with significant differences is verified.The coefficient of variation of the principal stiffness is less than 3%.The finite element analysis on the wing box was conducted using the Tsai's modulus estimation material model and the real material model,respectively.The deviation between the wing deflection and maximum principal strain obtained from the estimated material model and the real material model was less than 1%,confirming the feasibility of using the Tsai's modulus as the only engineering constant in the analysis on the entire composite material structure.This provides a new technical approach for rapid scheme iteration in the initial design stage of the structure.
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