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Hi everyone, I have a question regarding the boundary conditions. Is it possible to define translational boundary conditions which only act in one direction? So for example only in the positive X-direction and not in the negative X-direction. So that these regions can only transfer compression and separates if put under tension. This means that the reaction force can only work in the direction of the object and not in the opposite direction. Is this somehow possible? Regards, Mike
Hi, i have two questions: 1: is it possible to do cables in Inspire? I want to optimize nodes that are part of the substructure of a table that works with cables made of twisted steel-wire, so the cables should take no buckling and only tension should aplly on them, how could i do that in Inspire? i tried via the custom material settings by changing the materials properties, but without satisfying results. 2: can i do custom supports that allow the table legs to not move in negative z-direction (because the floor stops them), but that can move upwards in positive z-direction and in x and y? because for now i can only block the z-movement both up- and downwards at the same time, not in particular. i tried by not assigning supports, but only movement limitations in z-downward direction, but then the optimization would fail any help would be much appreciated! phil
Hey Guys! I have experimental data for composite tension compression and bending (3-point and 4-point) due to my university and I want to make a material card that can describe all of the mentioned test (and behavior) with proper accuracy. I would like to make tension, compression and bending (3-point and 4-point) test in Optistruct but I haven't make coupon test before. In the real tests the loads (movement of the clamping jaws) move at constant velocity. I have no experiment how to model such kind of load in Optistruct. I think there should be some non-linearity in the test because of the large displacement. How should I properly model such kind of problem? Do you have any experiment in modeling with velocity load in Optistruct? A further problem will be the bending tests where I think I should use contact surface to model the geometry of the bending machine tool's head. In Optistruct I used slide contact before, but it didn't work to well because of large displacement. Is it possible the handle open gap contact and make the 3-point/4-point bending in Optistruct? If you have any model for bending and tension and compression could you share with me? I would like to study the pre-process method to understand the nature of the coupon test in Optistruct. Thank you for your help and advise in advance! Best regards, Tüki
Hello at all, i made an analysis of a wireframe of a formula student car and created some loadcases for buckling. In HyperView there are some negative and some positive magnitudes for F (for buckling mode 4). I´m quite sure that this is the factor λ. So i thought if λ>0 (positiv) there is no buckling and if λ<0 (negativ) then there is buckling. Now i noticed, in every case where are the negative magnitudes, then a tension rod is buckling or deforming and when there is a positive magnitude then a pressure bar is buckling. I thought only rods/bars under pressure can buckle. My problem is to interpret these cases. Could it be that the buckling of a tension rod is a kind of neckling??? And when it is a kind of neckling, how to give an interpretation of the buckling? Why are tension rods are deforming in my buckling analysis? I hope you can help me. Regards, Rizzo