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Download LS-DYNA Structured User's Manual Version 960
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(Thermal Orthotropic Elastic with 12 Curves) Material Type 23 Material Type 112 (Finite Elastic Strain, Piecewise Linear Isotropic Plasticity) Columns 1-10 Quantity Card 3 Format Young’s modulus E10.0 11-20 Strain rate parameter, C E10.0 21-30 Strain rate parameter, p E10.0 1-10 Card 4 Poisson’s ratio E10.0 1-10 Card 5 Yield stress E10.0 Load curve ID or Table ID. The load curve ID defines effective stress versus effective plastic strain. Cards 7 and 8 are ignored with this option. The table ID, see Figure 3.9, defines for each strain rate value a load curve ID giving the stress versus effectiveplastic strain for that rate. The stress versus effective plastic strain curve for the lowest value of strain rate is used if the strain rate falls below the minimum value. Likewise, the stress versus effective plastic strain curve for the highest value of strain rate is used if the strain rate exceeds the maximum value. The strain rate parameters on card 3, the curve ID on card 6, and cards 7 and 8 are ignored if a Table ID is defined. E10.0 Tangent modulus, ignored if the stress-strain curve is defined below E10.0 Load curve number to scale yield stress to account for strain rate effects. E10.0 11-20 1-10 Card 6 11-20 1-80 Card 7 Effective plastic strain values (define up to 8 points) E10.0 1-80 Card 8 Corresponding yield stress values E10.0 The stress strain behavior may be treated by a bilinear stress strain curve by defining the tangent modulus. Alternately, a stress versus effective plastic strain curve (Card 5, Columns 11-20) similar to that shown in Figure 3.8 can be used. If eight point are insufficient, a load curve may be used with an arbitrary number of points. The cost is roughly the same for either approach. The most general approach is to used the table definition, (Card 5, Columns 11-20) discussed below. Three options to account for strain rate effects are possible. LS-DYNA Version 960 3.23.1m
