SPG/MCSPG Two-stage Joint Analysis [Document]
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Stage 1: Joining process analysis
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Self-Piercing Riveting (SPR), Flow Drill Screwing (FDS)​, Anchoring
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Stage 2: Joint performance analysis with histories from stage 1
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Lap Shear (LS), Coach Peel (CP), Cross Tension (CT), Pullout​
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Stage 1 and stage 2 are independent analyses​
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New boundary conditions, materials, etc. are allowed in stage 2​
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LS-DYNA Keywords for Two-stage​ Joint Analysis
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All necessary keywords for a regular LS-DYNA SPG/MCSPG simulation
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Additional keywords for stage 1:
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*INTERFACE_SPRINGBACK_LSDYNA
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To output FEM histories to file "dynain"​
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*INTERFACE_SPG_1​ (no parameter)
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To output SPG histories to file "1234spg"​
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Additional keywords for stage 2:​
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*INCLUDE
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To include FEM histories from "dynain" from stage 1​
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​*INTERFACE_SPG_2 (no parameter)
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To read SPG histories from "1234spg0"
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Rename "1234spg" from stage 1 as "1234spg0"​​
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Numerical Example​
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SPR joining process and joint performance analysis​
Applied force
Stage 1: Joining process analysis
In the SPR joining process, material separation and mechanical locking can be reasonably captured by the SPG/MCSPG method in stage 1 analysis. The force applied on the tool can be properly predicted by the numerical methods as well.
Stage 2: joint performance analysis (lap shear, coach peel, cross tension)
In stage 2, the histories (e.g. effective plastic strain, stress and deformed shape) from stage 1 are used as initial conditions. With the new added loading arms, various SPR joint strengths can be evaluated while only one simulation is performed for stage 1 analysis. Here, lap shear, coach peel and cross tension tests are analyzed in the second stage SPG/MCSPG simulation and the corresponding joint strengths are obtained effectively.