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pressure load on prestressed membrane
Posted 14 lug 2020, 11:14 GMT-4 Structural & Acoustics, MEMS & Piezoelectric Devices Version 5.4 0 Replies
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I've been trying to simulate a MEMS mebrane with anchors at the edges, which has a prestress (of about 300MPa) and has 1 bar pressure gradient between the two sides ( pressure applied on the front side) using static mechanics. None of the following works: - put all the solid mechanics (stress + pressure) together in a single solution step: I get two separate simulations, where the stress of the two results is added at the end (no stiffening due to prestress) - create two separate steps (or studies), first one for the stress, second one for pressure: in both steps (or studies) I modify the model configuation to split the solid mechanics loads, and in the second step (study) I set values of variables not solved for>user controlled, method>solution, stydy>first study (prestress), from solution>step 1 solution (prestress). See atached screen image. All I get is a deformation which is indipendent of the prestress, so no stress stiffening. Suggestions are most welcome, regards
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Hello Alvise Bagolini
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