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Myadam Nikhil

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  1. Sir, Sorry that I couldn't reply at the earliest. Please find the attached plots of both internal energy and total energy of the crushable material alone
  2. Hello Sir, The general expected energy patterns mostly signifies that the material is absorbing energy while it is undergoing a collision, reaches a maximum which signifies the end of crushing of material and rebounds back from the wall during which the energy absorbed by the body remains in the form of plastic deformation of material. But from the patterns I received, the material is releasing energy once the collision ends and returns back to its original shape. From whatever I have learnt over the past few years by experimentally testing different materials, this is not the expected pattern because the any crushable material doesn't show this type of behavior. Sir, I would kindly request you to have a look into it once again and let me know if the problem could be rectified. This is just my opinion how I see the analysis and I might also be wrong. I will consider your views and work upon it
  3. Hello, I am Myadam Nikhil. I recently started my dynamic simulations of few components by simulating a crash test where the component is made to hit the wall at a certain constant velocity. The component has been modeled using an orthotropic material, the properties of which are obtained from the experimental data. The component is made to impact the wall with a certain added mass. The input energy of the system (Kinetic energy) was found out to be 393.75 J (mass = 0.315 Kg and initial velocity = 50m/sec). But when the simulation is ran for a specific end time, the energy plots showed internal energy of the system greater than the input energy. Also the energy plot doesn't follow the usual characteristics.. The internal energy gradually increases to a maximum and then decreases back to its initial state. I faced this problem quite a few times and would request you to provide me with the best possible solution. Please find the attached 'hm' file and snapshot of the energy plot b.hm
  4. Sir, I will correct this mistake and keep you updated. I was curious enough to know if the parameters activated for defining the aluminum honeycomb material behavior were sufficient or not. They were young's modulus, shear modulus, yield stress functions in 3 directions and the Iflag parameter. Please correct me if anything important is missing
  5. Sir, Please find the attached .out file and the 'hm' file for your reference. I am exactly not sure if such points exist within the generated data. There will be regions in the behavior where the points may be identical in either X or Y directions. If such problem exists, how can we possibly rectify the mistake without drastically changing the behavior new_0000.out new.hm
  6. Hello, I am Nikhil from Manipal University I am currently running few crash simulations on Aluminum honeycomb using the RADIOSS Block 120 format to determine the samples energy absorbing capabilities in different directions because it is an orthotropic material by nature. I am using the material law 28 for defining the behavior. I have inputted its density, the young's and shear modulus in every direction and stress vs volumetric strain graph obtained when the sample was compressed in 3 directions. The data points for the stress vs volumetric strain plots were inputted into the curve editor panel from the excel sheet directly. This was done to save time because there are around 5000 points defining the behavior in each direction. Hence, I just copy - pasted them. When I ran the simulation, I came across the error: ERROR ID : 156 ** ERROR IN FUNCTION READ But when I inputted few random points (say 20) for each direction and ran the simulation, it went well without any errors. Could you people please suggest me with a solution for the same and a way to input such huge number of points on the panel? Thank you
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