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Finding Stiffness Matrices A, B, and D                Step 1 of 5

This calculator constructs the [A], [B] and [D] matrices of a laminated fiber-reinforced composite. Please enter the layout information (the angle of fibers of each layer) of your laminate and click next.


Layout Info
(Fiber angles)

  • Layout examples:
    1. 0° represents the fiber direction.
    2. [0°/90°2/45°]s should be input as "0/90/90/45/-45" and select "S" for symmetric.
    3. [0°/60°/30°/-60°/0°] should be input as "0/60/-30/30/-60/0" and select "T" for total.
  • Layout begins from top of the laminate as illustrated in the following figure.
  • All angles are in degrees. Click here for unit conversion.
  • Note that the degree sign ° is NOT part of the input.
  • A slash / must be in place as the separator between layers.
  • 'T' indicates that the input represents the fiber angles from the top layer to the bottom layer.
  • 'S' indicates that the laminate is SYMMETRIC in both geometry and material with respect to its mid-plane.
  • The maximum allowable number of input angles is 100. For 'T', that is 100 layers; for 'S', that is 200 layers.