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Kushgen

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About Kushgen

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  1. Hi, I am performing impact analysis in Radioss. I want to know the strain energy of each parts. Please let me know how to request for the strain energy of individual parts (not global). thanks Ramesh
  2. how do i automate automesh on a rectangular surface of any size?
  3. Hi, I need to create nodes for elements of user specified sizes. For eg, If the user specifies size 6 for the element, the nodes should be created at (0,0), (0,6), (6,0), (6,6). If the user specifies size 8 for the element, the nodes should be created at (0,0), (0,8), (8,0), (8,8). This is to be repeated to generate a geometry 830 mm*450 mm . therefore, if the element is of size 8, 830/8 elements must be created along the length and 450/8 elements along the width with their corresponding nodes. Please tell me how to automate this? Also, I need flexibility to change 830*450 mm dimensions to user specified dimensions (say 500*250 or 1000*600 etc etc). How do I incorporate this?? Currently for an element size 10 I've to write *createnode 0 10 0 0 0 0 *createnode 10 0 0 0 0 0 *createnode 10 10 0 0 0 0 *createnode 0 0 0 0 0 0 thanks, Kushal.
  4. Hi, I need to create nodes for elements of user specified sizes. For eg, If the user specifies size 6 for the element, the nodes should be created at (0,0), (0,6), (6,0), (6,6). If the user specifies size 8 for the element, the nodes should be created at (0,0), (0,8), (8,0), (8,8). This is to be repeated to generate a geometry 830 mm*450 mm . therefore, if the element is of size 8, 830/8 elements must be created along the length and 450/8 elements along the width with their corresponding nodes. Please tell me how to automate this? Also, I need flexibility to change 830*450 mm dimensions to user specified dimensions (say 500*250 or 1000*600 etc etc). How do I incorporate this?? thanks, Kushal.
  5. HI, @Prakash Pagadala, there's no communication from INDIA support team yet
  6. I'm trying to apply pressure loads on an aircraft wing. I've created a .csv file for the same . the first column of the file represents the wing chord, second column represents the wing span and the third represents the pressure magnitude(figure attached). When I apply this load on the wing, the pressure is not applied normal to the elements (figure attached). I've checked the element normals and they all point outward. I'm not able to figure out why the pressure is not being applied in the normal direction. Please suggest solutions. Thanks.
  7. you are most welcome to contact me for any information
  8. Hi @Prakash Pagadala, you suggested topology optimisation as per your previous replies. Hypermesh doesn't write a T0 value at all, it only writes TMIN when specified. I've tried this. There is no option in topology design variable to define T0. We can only define TMIN, so where does this T0 value come from? You can see in the .fem file attached above that there's no T0 entry. "Number of DVs will be more", what do you mean by DV? I request you to try this model once, suggestions are not working anymore
  9. hello @Prakash Pagadala I'm uploading the .fem file. I tried doing it the way you suggested but got an infeasible design. please try it at your end. Also please explain the difference between MEMBSIZ and TMIN used in the attached fem file. If I define the min. dimension using MEMBSIZ then what's the function of TMIN for topology optimisation? Maybe a shape optimisation will solve the problem by allowing the nodes to move outwards and increase the square size or move them inwards to decrease the square size. what do you think? square_foam_opti.fem
  10. @Prakash Pagadala Could you find a way to achieve this objective?
  11. Hi, I performed shape optimisation on this model. it only changed the thickness and not the square size. Kushal.
  12. Hello, 1. the shape must be restricted to a square for manufacturing reasons, hence, size optimisation may not be relevant. A different shape is acceptable if the pattern is repetitive and manufacturable. 2. the size of the square can't be changed independently else it'll not satisfy the buckling constraint. the size must be changed in tandem with the wall thickness to respect the buckling constraint
  13. Attached is a Hypermesh deck of a structure whose mass I’m trying to minimize. The structure has a square shaped core covered on the top and bottom by composite facesheets. Shell elements have been used for modeling. The size of the square and the thickness of its wall determine the buckling characteristics of the facesheets. I’ve modeled using a square of side 6mm and its wall thickness is 1.5 mm (shown in the snapshot below). By varying the size of this square and changing the wall thickness, I’m looking to minimse the mass, the constraint being that the buckling factor must always be greater than 1. Could you please help me achieve my objective? Thanks, Kushal Agarwal. square_foam_opti.hm
  14. Hello, I had a successfully running Radioss model, which I had modified by scaling down the model by a factor of 1/6 in all 3 directions X,Y and Z. When I execute a Radioss simulation with this scaled down model, the following messages are displayed -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 34785 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 13280 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 34648 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 12589 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 13006 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 13144 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 12867 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 12730 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 34786 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 13281 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 34649 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 12590 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 13007 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 13145 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 12868 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 12731 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 34787 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 36701 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER 29495 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 38574 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 38696 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 38799 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER 29062 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 38812 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER 30039 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER 28760 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 38589 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 38711 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 34503 --CONSTANT TIME STEP 4N SHELL ELEMENT NUMBER 28907 -- CONSTANT TIME STEP FOR SHELL ELEMENT NUMBER 36670 NC= 0 T= 0.0000E+00 DT= 6.7177E-05 ERR= 0.0% DM/M= 2.0371E-02 The simulation runs after these messages are displayed. I'm unable to understand why I receive this constant time step message. Please give your inputs as to how to take corrective steps to prevent the same. Thanks, Kushal.
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