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Peter_TRH

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1. Optimization without vertical structures

thanks for your reply. I am using 2017.2. I read your docment. I am using the overhang like it is shown there, but the problem remains the sam. It worked (acceptable calculation time) for 60deg with an overhang ov 10deg, but the result was not satisfying because only the print direction is taken into account (no rotation of this direction to get the 60+-10deg in all all directions) which makes sense. Maybe this doesn't work porperly because it's not thought for this. Is there any other way to achieve a structure without vertical members? Thanks!
2. Optimization without vertical structures

Hi all, I’m trying to achieve a specific shaped structure through optimization but I couldn’t reach this goal yet. I want to achieve a structure which (of course) fulfill all constraints, with minimize weight. So far so good but I want that during the optimization, no horizontal structures are created I tried it with draft in one direction, but the results were no satisfying. At least it would maybe help if it is possible to create two different draw directions (x- and y-direction). Is this possible? I also tried to manipulate the AM-Overhang-Constraints with 0° in horizontal and 60° vertical to get structures with at least 40° vertical, but through this it needs over 100h for 6 Iterations without creating an satisfying shape. Is there a workaround I haven’t considered yet? Thanks in advance!
3. Stress Constraint at Topology Optimization

Hi, thanks for your quick reply. The global stress constraint you are talking about..is the "DTPL-constraint" right? What exactly to you mean with: a large differentia﻿l in response values between design and non-design spaces ? Thanks
4. Stress Constraint at Topology Optimization

Hi all, can someone please explain to me the difference between defining the stress constraint via DTPL - Card and by DRESP1-card? All the tutorial models show differerent solutions without explaining the difference in detail. Thanks in adance!! Regards Peter
5. Pretension

Hi all, I’m trying to make a small model to show how pretension is working. For this I made a bolt and fixed it on both sides with DOF1-6 and added one pretension in the middle of the bolt. But it shows me deflection by 10^5. I expected a positive and a negative defection since the nodes at the spoint are copied an overlapped. Where is my error I reasoning? Thanks!
6. Postprocessing weird stress plots

I have also treid it with quad4..same results.
7. Postprocessing weird stress plots

It's vonMises, but I am getting same results at P1..but not at P3 One more information: I'am using 2D-Elements
8. Postprocessing weird stress plots

Hi tinh, thanks for fast reply. I also tried this, but averaging makes it worse...
9. Postprocessing weird stress plots

Hi everyone, I am dealing with a Problem at Postprocessing I cannot handle. My stress pot looks weird (image attached). I am using QUAD8-elements and I apply a single force one one side an a clamp on the other side ( cantilever modell with a changed geometry) with a quasi-static Loadcase. Can anybody help? Thanks in advance!! regards Peter
10. SRCHDIS in Combination with CLEARANCE

Hi all, i’ve got a problem regarding understanding contact modelling in optistruct: I’s clear for me what the clearance is (overwriting the behavior that the contact is closed if the distance is greater than the initial distance). In my case I’ve the case that one surface is allowed to move towards another surface by 2mm. So my clearance is 2 (close the contact after 2mm of movement). The point I don’t get in this case is the SRCHDIS: If I define the contact, the master and the slave surfaces are already defined, for what reason I would need a SRCDIS in this case? I’m reading that this is the distance in which the opposite gap-node is searched. But if I chose SRCHDIS as f.e. 2mm than it would find other surfaces at every step as the contact surfaces move to each other. Whats my mistake? Can you give me maybe an example where the SRCHDIS is needed? Thanks in advance!! Peter
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