I am running an analysis in ABAQUS/Standard V5.7 and am reading in 
     field variables over aperiod of time.  I have a results file with data 
     for the time periods 5.1, 10.2, 15.3, 20.4, 25.5 and 30.6 years at 
     increments 10, 20, 30, 40, 51 and 61 respectively.
     
     I am trying to obtain results at a particular point in time ie. 22 
     years.  Due to scaling factors the field variable time history does 
     not behave as it should.
     
     I have also tried adding data to the results file for the time 22 
     years at an increment of 45, and applying two steps to the analysis.  
     One to take the analysis up to 22 years and then another step to 
     continue from 22 years up to 30.6 years.  When plotting the time 
     history of this field variable against time it shows a linear response 
     up to 22 years as expected then between 22 and 25.5 years it falls off 
     slightly, then from 25 years to 30.6 years the response is linear 
     again but instead of using the 25.5 year data it is being scaled down 
     somehow.
     
     Extract from input deck:
     
     **STEP 1, START UP
     **
     *STEP, AMPLITUDE=RAMP,NLGEOM
     **
     *STATIC
     0.001,0.001
     *TEMPERATURE,OP=MOD,INPUT=fuel.tmp.0 *FIELD 
     VAR=2,OP=MOD,INPUT=fuel.tmp.0 *END STEP
     **
     **
     **STEP 2, IRRADIATE TO 22YRS
     **
     *STEP, AMPLITUDE=RAMP,INC=100,NLGEOM **
     *STATIC
     0.51,22.0
     *TEMPERATURE,OP=MOD,FILE=alltemps,BSTEP=1,BINC=10,ESTEP=1,EINC=41 
     *FIELD VAR=2,OP=MOD,FILE=alltemps,BSTEP=1,BINC=10,ESTEP=1,EINC=41 *END 
     STEP
     **
     **
     **STEP 3, IRRADIATE TO 30.6YRS
     **
     *STEP, AMPLITUDE=RAMP,INC=100,NLGEOM **
     *STATIC
     0.51,8.6
     *TEMPERATURE,OP=MOD,FILE=alltemps,BSTEP=1,BINC=10,ESTEP=1,EINC=61 
     *FIELD VAR=2,OP=MOD,FILE=alltemps,BSTEP=1,BINC=10,ESTEP=1,EINC=61 *END 
     STEP
     **
     **
     **STEP 4, SHUTDOWN
     **
     *STEP, AMPLITUDE=RAMP,INC=100,NLGEOM **
     *STATIC
     0.001,0.001
     *TEMPERATURE,OP=MOD
     NALL,20.0
     *END STEP
     
     
     Has anyone experienced this, and do you know how to overcome it?
     
     Regards,
     
     Richard Charles
     AEA Technology plc


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