*constrained beam in solid - ls-dyna
TRANSCRIPT
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*CONSTRAINED_BEAM_IN_SOLID
Hao Chen
Livermore Software Tech Corp
2017 LS-DYNA China Conference October,2017
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About Me
• Hao Chen, [email protected], 925-245-4552
• 1997-2002, Northwestern University, Ph.D., Computational Mechanics
• Jan 2003, joined LSTC, ALE and FSI
2
Useful links
• http://ftp.lstc.com/anonymous/outgoing/hao/cbis
• http://ftp.lstc.com/anonymous/outgoing/hao/sale
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*CONSTRAINED_BEAM_IN_SOLID
SLAVE MASTER SSTYP MSTYP NCOUP CDIR
101 1 1 1 2 1
AXFOR
-10/1001
To replace *CONSTRAINED_LAGRANGE_IN_SOLID CTYPE 2.
1. NCOUP: Additional coupling points between beam nodes. CLIS ctype 2
caused kinetic energy to increase due to a faulty algorithm.
2. CDIR and AXFOR: to model debonding process.
3. R-Adaptivity: Solid parts are remeshed during simulations.
4. Tetrahedral and pentahedral supported.
5. Velocity/Fixed B.C. applied to solid nodes.
6. Implicit MPP supported.
7. Penalty coupling using _PENALTY.
8. Sorting/searching optimized.
9. Thermally coupled.
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Debonding using CDIR & AXFOR
Reinforced concrete under cyclic
loading
• For a RC beam-to-column
connection tested by Girgin et
al. (2015).
• The obtained hysteretic
response and damage pattern
were significantly affected by
rebar slip.
Courtesy : Prof. Yannis Koutromanos, Virginia Tech
To model the debonding process between steel reinforcement and concrete, we need to • Relax the constraint along beam axial direction. (CDIR=1) • Apply a debonding force based on relative motion. (AXFOR)
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Reinforced Concrete Under Cyclic Loading
Contact_1D CONSTRAINED_BEAM_IN_SOLID
Unrealistic damage pattern
(excessive damage in joint
region)
Inaccurate hysteretic
response
Correct damage pattern
(damage in joint region
and at beam ends)
More accurate
reproduction of
hysteretic response
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CBIS with R-adaptivity
Courtesy : Shinya Hayashi, JSOL
To model the manufacturing process of Fiber Reinforced Plastic
• Model the shear force between fiber and the matrix. (AXFOR)
• The matrix undergoes large deformation; Remeshing needed.
• CBIS needs to dump out and read back history variables related to debonding force calculations during each restart.
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Fiber Reinforced Plastic Molding
Courtesy : Shinya Hayashi, JSOL
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Compression molding
Courtesy : Shinya Hayashi, JSOL
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Thank You