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  1. Hello Prakash, For one material, by varying the volume fraction, there will be different output structures. How do I choose the optimal structure (and corresponding volume fraction). Is it one with minimum strain energy and which has better connectivity between elements?
  2. Hello Prakash, Thanks for the reply. This is a conceptual doubt I am trying to run a Matlab program for the topology optimization (http://www.topopt.dtu.dk/files/matlab.pdf) , I think this particular code doesn't take Elastic modulus into effect. Also as you have asked I am not sure on how to choose the volume fraction, if I have multiple structures for one single material by varying volume fraction. which one should I choose. (is it one with min strain energy and which has better connectivity between elements)? Thanks
  3. Hello, I am trying to run a topology optimization problem on a body for different materials (keeping the volume fraction fixed). I am getting similar structures, if I change the volume fraction of one material the structure changes completely. With change in volume fraction there is change in amount of material distributed and this would be the reason for change in structure with change in volume fraction. but what is the reason for same structure for different materials (keeping volume fraction fixed) ? Thanks
  4. Thank you Gopal, Yes the analysis was linear static, and the boundary conditions and other parameters are exactly the same. The results like you say are very comparable for materials as different as Titanium and Nylon! If not linear static, can you suggest what other analysis I can use? Also, for the topology optimization i am trying to minimize the volume, and gave the Yield Strength of the material as the constraint for stress, volume upper bound as 0.7 and 0.3 as lower bound. The objective is to minimize compliance. I am getting an Error 14 - Missing RANDPS, which is the loading. Are the constraints and objective correct? Please look for the attached HM File. Truck_Titanium_ND_2.hm
  5. Hello Prakash, I ran an FEA Analysis for the model with two material materials for the truck, Aluminium and Nylon. I got the same displacement and stress results for both the materials, even tough the Young's modulus for the materials is different. Is this some how related to the pressure given on the surface. Are the units of Pressure N/mm^2. truck_Aluminium.hm truck_nylon.hm
  6. I made the model into 2 components independently meshed the components. Then i used TIE contact to connect them along 4 surfaces. The final aim of the optimization is to reduce the weight of the truck. The truck is made of Aluminium and bushing is a flexible rubber like material which remains as it is throughout the optimization. I ran a basic FEA analysis and got the following errors: There were 4 error messages during input processing. The first message is repeated below: *** See next message about line 2033 from file: C:/Users/Student/Desktop/HM/FEA/truck.fem "TIE 1" *** ERROR # 1000 *** in the input data: Incorrect data in field # 4. truck.hm
  7. Hello Prakash, The previous file had 2 parts in one IGES file. The assembly has 2 parts bushing and truck I am attaching another file which has 2 iges files in it. I am looking for ways to connect these 2 parts, mesh them and topology optimize them. Assembly description: 1. There is a cylindrical part (bushing) which would concentrically align to the curved surface of the pin and inner curved surface of the truck. 2. The base of the bushing would align to two different bases on the truck. Attached is an image for clear understanding bushing_CAD.IGS Truck_Assembly.IGS Truck_CAD_KP.IGS 12.hm
  8. I am trying to topology optimize a multi-material part. I imported an assembly iges file and defined properties for 2 different parts, how do i give the contact between the 2 parts. How to perform a basic FEA and topology optimize these kinds of parts. Assembly_9.hm
  9. Sorry i did not notice that, Here is the HM file topology.hm
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