We’re putting the final touches on our new badges platform. Badge issuance remains temporarily paused, but all completions are being recorded and will be fulfilled once the platform is live. Thank you for your patience.
LS Dyna

LS Dyna

Topics related to LS-DYNA, Autodyn, Explicit STR and more.

Nonlinearity of *MAT_ELASTIC

    • shahria
      Subscriber

      Hello everyone,

       

      I am working on a simple explicit model that contains only a cubic body in tension. I used the 4 node tetrahedral mesh (ELFORM=10) and MAT_ELASTIC material model with the default time step control settings. However, when I plotted the Stress-Strain curve from the Force and Displacement values of the model, the curve appeared to be nonlinear. After a closer look at the documentation I found out that MAT_ELASTIC is hypoelastic material model, which might be the reason for this non linear elastic behaviour. Can anyone please suggest a way to achieve linear elastic material behavior in Ls Dyna Explicit? I am having a hard time finding any.

       

      Thanks,

      Shahriar.

       

       

      Image preview

       

       

    • Pedram Samadian
      Ansys Employee

      Hi Shahria,

      It has nothing to do with the hypoelasticity of the material model. Have you tried other element types? 1-point tetrahedral solid elements (Type = 10) are not recommended for general metal forming applications. I developed a cube tensile model with *MAT_ELASTIC and Element Type 1 and got a linear load-displacement response. Similar results are obtained using common element types of -1 and -2. 

      Thanks,

      Pedram

       

Viewing 1 reply thread
  • You must be logged in to reply to this topic.