Hello, I'm using Pro-Mechanica at present for the modelling of water storage tanks, as part of our engineering department's work on low-cost domestic rainwater harvesting. Having made solid models of possible tank designs, I now want to apply suitable constraints for the FEA analysis. Ideally I would like to be able to constrain the base of the tank such that any displacement downwards would generate a resistive force that increased with displacement (probably linearly), but that any displacement upwards would not generate any resistive external force. I seem to remember the old Pro-Engineer version of mechanica having a spring constraint option in the constraint dialogue box, but in Wildfire the options are now free, constrained, or specified displacement. Does anyone have any advice? Thanks, Gwilym Gwilym
