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Figure 20, Zero clastic membrane, Figure 21, 22, and 23 Inflatable membranes with a pre-stressed cableFigure 20 shows a zero clastic membrane. A higher pre-stress within the surface of the membrane will notlead to a curvature besides the wrinkling of the parts with a lower pre-stress. This will happen if the ratiobetween the tension in the both parts is more than 2.3.2.5 Inflatable membranes with a pre-stressed cableFigure 24, 25, and 26: Three equilibrium surfaces with the same equally spread upload. The force density proportionsin border cable, cross cable and net have been varied:• Figure 24 The force density in the border cable is 12, in the cross cable is 1 and net cable is 1• Figure 25 The force density in the border cable is 12, in the cross cable is 12 and net cable is 1• Figure 26 The force density in the border cable is 1, in the cross cable is 12 and net cable is 1Figure 21, 22 and 23 shows a pre-stressed cable on or in the surface of an inflatable. This will always givea synclastic curvature in the surface of the membrane. When the cable is pulled out of the surface of aninflatable, the surface next to the cable will be anticlastic.38