Error "severe (157): Program Exception - access violation"

dan.mnation · 2020-08-05T03:52:52Z

Hi all, Relative noob here. I am a student working on an impact test on a bicycle helmet design with a Biofidelic head model. I keep having issues in solving the study at a set point it crashes continually with an error "forrtl: severe (157): Program Exception - access violation". I have run successful tests in an identical setup with a ballast head model (no internal organs etc) with great results. I am wondering if anyone has any ideas as to what causes this problem. I have a suspicion that when I set up the head model in the current tests, there may be an issue with my contacts defined as I am still trying to get my head around the correct ones to use etc, but I have tried lots of different combinations to get this to work correctly with no success. Photo attached. Any suggestions are greatly appreciated :) TIA! -Dan LS3.jpg

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Last Post by CalebPetersenPhD 5 years ago

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August 7, 2020 1:43 pm

(@negativevolume)

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Also, here was another brief topic on this:

https://feassistant.com/forums/ls-dyna/the-error-of-ls-dyna-cutting-simulation/#post-281

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CalebPetersenPhD

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September 23, 2021 9:44 pm

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Guys, I was having issues with the Severe (157) error in an SPH simulation on SMP (with the routines "SMP_NEIGHBOR" and "SPH3D" apparently having issues). The model also didn't work in MPP but warned me that I needed to increase the number of nearest-neighbors in *CONTROL_SPH (NMNEIGH). I increased that (350 in my case) and it worked fine. I hope this helps anyone who is getting the Severe (157) error in LS-Dyna with SPH simulations.