LS Dyna

LS Dyna

How to compute normal force?

    • Simone Saraceno
      Subscriber

      I'm working on crashes against inclined barriers, and I need to compute the force normal to the barrier. 

      I tried different options implemented in LS-PrePost, but none of them gave me the desired output. The only thing that seemed to work was to download the plot of the X-Force, and multiply it by cos(alfa) on excel. However, this is not a very convincing way of obtaining it. So, how can I obtain the force normal to the barrier directly on LS-PrePost?

    • Ram Gopisetti
      Ansys Employee

      Hi , could elobrate the question, what force are you loking, SPC or contact ?

      Cheers, Ram 

      • Simone Saraceno
        Subscriber

        Hi, I’m looking for the contact force component perpendicular to the barrier. I tried by creating a local coordinate system, but I wasn’t able to assign it to the rcforc database. In the photo you can better see the force I’m looking for:

    • Simone Saraceno
      Subscriber

      Hi, I’m looking for the contact force component perpendicular to the barrier. I tried by creating a local coordinate system, but I wasn’t able to assign it to the rcforc database. In the photo you can better see the force I’m looking for:

    • Ram Gopisetti
      Ansys Employee

      use local coord system specific tom that part and check the forces, in general check the contact forces 

      Cheers, Ram 

      • Simone Saraceno
        Subscriber

        Sorry but I'm quite new to LS Dyna. How can I use the local coordinate system specific of a part to check the contact forces?

    • Reno Genest
      Ansys Employee

      Hello Simone,

      You can define a local coordinate system in your model. Then, on the contact optional card C, you can specify which local coordinate id to use to compute the rcforc using the CID_RCF parameter:

       

      Reno.

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