Question about quasi static metal cutting using LS DYNA

- March 8, 2021 at 9:07 am
  
  Haiquan
  Subscriber
  
  Hello
  I am doing a ½ model metal cutting in LS DYNA as shown below. Some informations of the model:
  1/ The cutting tool is linear steel, and workpiece is aluminum in 400°C initial condition( bilinear plasticity model, Young‘s modulus=18000Mpa, yield strenght=36Mpa, tangent modulus=3000Mpa, with plastic strain failure EPS=0.0008)
  2/ The real cutting duration is about 1s.
  3/ Contact, hourglass, section and analysis setting with damping 0.01 is shown below
  
  My questions are:
  Why the reaction force at fixed support is so noisy even the duration is 1s(quasi static)? The noisy result seems not reasonable, as the force should increase gradually. Is there any problem with my contact and material model?
  Thank you in advance
- March 8, 2021 at 12:46 pm
  
  peteroznewman
  Subscriber
  
  nData from Explicit Dynamics solutions are well known to be noisy. nSee this discussion: https://forum.ansys.com/discussion/22636/mesh-convergence-on-explicit-dynamicsn
- March 11, 2021 at 8:04 am
  
  Haiquan
  Subscriber
  
  Thank you so much for your information! I am trying your proposaln

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