Seat Belt Modeling in LS-dyna
mechanical singh
I have a query regarding seat belt modeling in LS-Dyna.
I am using 2-D fabric material and belt is passed through the D-ring and Buckle as it is in actual ( I am not using slipring element of LS-dyna). The pretensioner of type 7 in used in which given curve is force vs time. Retractor is given a loading (Force vs Displacement) and unloading curve(Force vs Displacement).
Pretensioner firing time has been given as 18 msec and 3 msec delay has been given. PT loading curve has been given from 0 msec to 12 msec. Retractor (FL) firing time is given as ~32msec (18+3+12 = 33). However, with this setting, I’m observing a sudden drop in load at 32~33 msec. My understanding of the problem, it is happening due to mismatch in coupling of PT and FL in CAE. Can anybody through some light on this?
James M. Kennedy
Dear Jalaj,
Some general notes on seat belt contact modeling:
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Please see the following note:
Yeh, I. , "LS-DYNA Seat Belt Modeling Guideline", June, 2007.
http://www.scribd.com/doc/ 67405039/Seat-Belt-Guideline-1
http://ftp.lstc.com/anonymous/outgoing/jday/SeatBeltGuideline1.pdf
Yeh, I. , "LS-DYNA 2D Seat Belt Modeling Guideline", June, 2009.
http://ftp.lstc.com/anonymous/outgoing/jday/SeatBelt2DGuideline.pdf
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Kang, S., Chen, C., Guha, S., Paladugu, M., Ramasamv, M.S., Gade, L., and Zhu,
F., “LS-DYNA Belted Occupant Model", 15th International LS-DYNA Users Conference,
Dearborn, Michigan, June, 2018.
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Dahlgren, M., Vishwanatha, A., Soni, A., Engstrand, K., Forsberg, J., and Yeh, I.,
“Belt Modelling in LS-DYNA", 16th International LS-DYNA Users Conference, Dearborn,
Michigan, June, 2020.
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Introduction to Seat Belt Modelling
https://www.youtube.com/watch?v=yte6Do91E7A
Introduction to Dummy Positioning
https://www.youtube.com/watch?v=MewIEzBVSpc
Advanced Seatbelt Modelling in Oasys PRIMER
https://www.youtube.com/watch?v=dZcpkd4wKxA
4 Pt Harness LS-DYNA Files
https://wehasem.blogg.se/2022/may/4-pt-harness-ls-dyna-files.html
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Sincerely,
James M. Kennedy
KBS2 Inc.
August 24, 2022
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James M. Kennedy
p.s.
https://www.slideshare.net/akshay14september/everything-about-seatbelts
From: ls-d...@googlegroups.com [mailto:ls-d...@googlegroups.com] On Behalf Of James M. Kennedy
Sent: Wednesday, August 24, 2022 9:31 AM
To: 'mechanical singh' <mechani...@gmail.com>; 'LS-DYNA2' <ls-d...@googlegroups.com>
Subject: RE: [LS-DYNA2] Seat Belt Modeling in LS-dyna
Dear Singh,
To view this discussion on the web visit https://groups.google.com/d/msgid/ls-dyna2/000701d8b7c6%2419fc6a90%244df53fb0%24%40kbs2.com.