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[FAQ]

LS-DYNA can output the frictional energy density to the binary intfor database. The following need to be specified in the input file before running the model. 1. Set FRCENG to 1 on card 4 of *CONTROL_CONTACT. 2. Include the command *DATABASE_BINARY_INTFOR_FILE to assign an output time interval and a file name for the intfor database. 3. Set the contact print flags to 1 (SPR and/or MPR) for the contact surfaces to be included in the intfor database. The intfor output file can be accessed with LS-PrePost in the same manner as d3plot. LS-PrePost labels the frictional energy density as “Surface Energy Density” and can be fringed by selecting “Fringe Component” and then “Segment”. The time history of a specific segment can be obtained through History > Segment > Surface Energy Density. The frictional energy of a contact segment is the Surface Energy Density of the segment times the segment area. The summation of the product (segment Surface Energy Density * segment area) over all segments of either the master or the slave side gives the frictional energy component of the sliding energy which is reported in the output file sleout. It is recommended to use segment sets for defining the contact surfaces in the CONTACT card.