Module for generating carpet plots

General

Carpet plots are often used in aviation for fast pre-layout of laminates. The exact number of 0°, 90° or ±45° layers is not important, only their ratio to each other. The carpet plot therefore depends solely on the material properties and no separate laminate needs to be created. For this reason, the carpet plots are created for materials and not for laminates.

The diagram of the carpet plot itself provides information about the Young's modulus, shear modulus and the transverse contraction number in terms of the engineering constants of a laminate as a function of the ply ratios. As already mentioned, a ply structure of the form [0/90/±45]s is assumed, whereby the thickness of the plies or the number is varied.

Structure

1 - Target size selection

In the current version, it is possible to create a carpet plot for three variables (modulus of elasticity $E_x$, shear modulus $G_{xy}$, transverse contraction number $\nu_{xy}$) of the laminate. The size to be displayed can be selected using the three radio buttons.

2 - Representation

The actual carpet plot is shown in this area. The proportion of ±45° layers is plotted on the abscissa and the actual target value, e.g. the Young's modulus, is plotted on the ordinate. The corresponding curves are then plotted for a proportion of 0% to 100% of layers in the 0° direction. The proportion of 90° layers is calculated automatically by subtracting the percentage points of the 0° and ±45° layers from 100%.