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1. ## Some questions in Optistruct

Hi,@Prakash Pagadala Regarding the third problem, for example, the shell element is used to size optimization of the steel plate, and whether the thickness can be optimized according to the coordinate value (such as the y-axis coordinate) in the dimension optimization, for example, the thickness of the left end element is 1, the right end thickness is 2, how to achieve the middle part of the shell element thickness varies linearly with the Y-axis coordinate between 1 and 2. In addition, can the dynamic load be loaded in the Optistruct? I want to use Optistruct to do the size optimization of the steel plate under a speed impact. I don't know if it is feasible.

3. ## Some questions in Optistruct

Hi，I am sorry to ask questions again. Now I am studying the structural optimization design of the automobile B-pillar. This time, there are about three minor problems to be solved. 1. I don't know how to set the variable thickness shell element. I saw the following method to set the variable thickness unit in a journal. Setting different thickness simulation shells for the four nodes of the shell element, but I don't know how to achieve it. Can you give me some advice? 2. Since currently optimized based on the B-pillar, the B-pillar components are taken out of the vehicle as shown in the following figure. How do you impose constraints on the upper and lower ends to simulate the vehicle constraints as much as possible? In other words, how to apply constraints to the B-pillar to simulate the constraints in a real vehicle.？ 3. Can the size optimization in Optistruct set the coordinate value to the design variable? In addition, can velocity load be applied in optistruct? Thank you in advanced.
4. ## how to creat cohesive element with optistruct

Hi,@Prakash Pagadala, Thank you very much for your tutorial and patient guidance. I tried it according to your tutorial. Some questions are not understood. First, the pattern grouping in your tutorial is in topology optimization. Is it also applicable in free size optimization? Secondly, I think that in the TRB transition zone, the thickness of the thin zone and the thick zone are connected, and the thickness can be changed linearly to avoid abrupt changes in the thickness of the thin zone and the thick zone after optimization, resulting in uneven distribution of stress. It is possible that I do not understand the pattern grouping corrcetly. So, I really don't know how to apply pattern grouping in the transition zone. Ideally, I want to get the shape shown below， There is still a question. How can the thickness after optimization be more intuitive? Can I generate files in .fem format for easy viewing? thank you.
5. ## how to creat cohesive element with optistruct

Hi ，@Prakash Pagadala I tried the previous method and quoted the Dequation. I found that only the thickness of the transition zone was obtained, but I could not get a continuous linear thickness. By consulting other people's literature, I found that the author set the plate thickness and the transition zone coordinates into design variables. This gives a linear change in the thickness of the transition zone, but I am not sure how to set the transition zone coordinates as design variables. In addition, regarding the second method, to be honest, I have not figured out how to set linear/planar pattern grouping up. Can you provide some information or tutorials for Method 2?
6. ## how to creat cohesive element with optistruct

Hi，@Prakash Pagadala， I made a simple size optimization model, the following is the fem file, found that the deequation setting does not work, I can not figure out what the reason, if it is convenient, then introduce me some tutorials or cases in this area, explore for a long time to find No reason, please give pointers, thank you tranzation zone.check.8.fem
7. ## how to creat cohesive element with optistruct

Hi, @KH+ ,Thank you， Thank you very much for your suggestion. I will try the method you provided. In addition, if it is convenient, can you provide a tutorial or an example of this? As a newbie, I still need to work harder. Thanks。

9. ## how to creat cohesive element with optistruct

Hi，@Prakash Pagadala,，I may not express it clearly. I made a simple example. The whole part uses a shell element, in which the green area is a thick area, the red area is a thin area, and the middle yellow part is a transition zone, as shown in the first image. Then the material properties are assigned to the components, and the thickness is set separately, the thickness is 2 mm, the thin zone is 1 mm, and the intermediate transition zone is 1.5 mm, as shown in the following figure. My main purpose is to do size optimization of the thick and thin areas. Since the thick and thin areas are different after thickness and the thickness is not continuous, the transition zone is set to achieve continuous thickness variation. The thickness variation is shown in the figure below. I don't know how to set the design variables of the thickness of the thick and thin areas and the relationship with the transition zone.I don't know how to achieve the continuous thickness effect of the illustration below。 Now，Could you give some suggestion？

11. ## how to creat cohesive element with optistruct

Thank you，@Parkash Pagadala， Just as the B-pillar in the first picture is divided into four regions, it is now necessary to optimize the size of the four regions according to the stress state, and optimize the thickness of the four regions separately, and set different upper and lower limits of thickness, due to the optimized phase. The thickness of the adjacent area is different, and the transition zone needs to be set so that the thickness continuously changes like the second picture. could you give me some advice？
12. ## how to creat cohesive element with optistruct

Thanks for your help, @Parkash Pagadala, Could I ask another question? About Tailor Rolled Blank (TRB) When I was designing the sub-region size of the steel plate, I started thinking about the transition zone, so that the optimization result was wrong, but now I don't know how to create the transition zone. Can you give me some advice? Thank you.
13. ## how to creat cohesive element with optistruct

Thanks, @Ivan，，It's helpful for me. The latest RADIOSSS version is very different from the previous version. Recently, it is mainly to optimization. RADIOSS will learn slowly later, thank you. Can I ask another question? About Tailor Rolled Blank (TRB) When I was designing the sub-region size of the steel plate, I started thinking about the transition zone, so that the optimization result was wrong, but now I don't know how to create the transition zone. Can you give me some advice? Thank you.
14. ## how to creat cohesive element with optistruct

Hi @Ivan，Thanks for your reply。 You are right, I tried to use RADIOSS to do some optimization design, found that it is difficult to operate, It is not convenient as OPTISTRUCT, and I am not sure whether RADIOSS can do the optimization design of composite materials like OPTISTRUCT? There is another question. Do you think that SB allowable inter-laminar shear stress should only be applied between composite layers, between PLY and PLY? It is possible that I did not express clearly. I want to design a composite board and a steel plate, composite plate and steel plate are bonded with COHESIVE element, temporarily do not consider the interlaminar shear stress between composite ply layers. Could you give some good suggestions?
15. ## how to creat cohesive element with optistruct

Thank you for your reply,I am a newbie, recently working on the optimization of composite materials, a layer of composite material with a layer of steel, and the layers are bonded with cohesive elements. I don't know much about RADIOSS. I am not sure if RADIOSS can be optimized like OPTISTRUCT? Could you give me some RADIOSS tutorial on composite material optimization design? Thank you .
16. ## how to creat cohesive element with optistruct

Hi, there is a question I would like to ask the teachers, recently learn to use optistruct for composite material optimization design, encountered some unsolvable problems, I want to use the cohesive element to simulate the cementation damage between the composite layers, but there is no cohesive material in the hypermesh. There is no such material property, no damage evolution rule and damage criterion of the cohesive element. There is a cohesive element in the hypermesh-abaqus interface, but I don't know how to call it in the optistruct. So,is there any methods to solve this ,could you give me a reply .best wishes.
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