This option is used to define material coefficients for low-density foam materials. The *LOW DENSITY FOAM option must be used in conjunction with the *UNIAXIAL TEST DATA, DIRECTION=TENSION and the *UNIAXIAL TEST DATA, DIRECTION=COMPRESSION options to specify the stress-strain response of the foam material in uniaxial tension and compression, respectively.
Product: Abaqus/Explicit
Type: Model data
Level: Model
Use this parameter to define the strain rate measure used for constitutive calculations.
Set STRAIN RATE=VOLUMETRIC (default) to use the volumetric strain rate.
Set STRAIN RATE=PRINCIPAL to use the nominal strain rate along each principal direction of deformation.
Use this parameter to specify extrapolation of rate-dependent uniaxial stress-strain curves beyond the maximum specified strain rate.
Set RATE EXTRAPOLATION=NO (default) to prevent extrapolation. The curve corresponding to the maximum specified strain rate will be used for strain rates greater than the maximum.
Set RATE EXTRAPOLATION=YES to trigger extrapolation beyond the maximum specified strain rate by using the slope with respect to strain rate.
Include this parameter to specify a tension cutoff value for the maximum principal stress that the low-density material can sustain with tension. The tension cutoff value must be greater than zero.
This parameter is relevant only when the TENSION CUTOFF parameter is used.
Set FAIL=NO (default) to force the maximum principal stress to remain below the tension cutoff without deleting the element.
Set FAIL=YES to allow element deletion when the tension cutoff value is reached.
. The default is =0.0001 (time units).
. The default is =0.005 (time units).
. The default is 2.