I have to set and run a experiment as of the following. A pressure has to be applied and sustained on the inner surface of the hemisphere; 4 Pa. The pressure has to be sustained throughout the experiment duration; hence I applied the pressure in the initial step with curve editor value as (0,4) to (1,4).
Subsequently, a pressure of -85.5 Pa is to be applied onto the base surface of the extruded part on the hemisphere. I added the pressure as an additional step with the curve editor value as (0,0) to (1, -85.5). The number of time steps and step size was set as the default of 10 and 0.1 respectively for the 2nd pressure loading. However, negative jacobian pts were encountered during the running in febio (filename: exp1.feb). So I modified the time step and step size to 10 and 0.001 respectively. This allowed the file to run in febio (filename: exp2.feb). However, technically with these modified magnitudes, the time duration for the 2nd pressure loading should be 10 x 0.001 = 0.01. With that assumption, I further changed the curve editor value now to (0,0) to (0.01, -85.5) instead and tried to run it in febio again. However, the file ran into error termination again (filename: exp3.feb) with negative jacobians.
This has left me quite confused about what the relation is of the curve editor values wrt the time step/step sizes.
Exp1.feb (error)
Intial step: 1st pressure load of 4 Pa applied (0,4) – (1,4)
Step 1: 2nd pressure load (0,0) – (1,-85.5)
Steps/step size = 10/0.1
Exp2.feb (runs in febio)
Step 1: 2nd pressure load (0,0) – (1, -85.5)
Steps/step size = 10/0.001
Exp3.feb (error)
Step 1: 2nd pressure load (0,0) – (0.01,-85.5)
Steps/stepsize = 10/0.001
Subsequently, a pressure of -85.5 Pa is to be applied onto the base surface of the extruded part on the hemisphere. I added the pressure as an additional step with the curve editor value as (0,0) to (1, -85.5). The number of time steps and step size was set as the default of 10 and 0.1 respectively for the 2nd pressure loading. However, negative jacobian pts were encountered during the running in febio (filename: exp1.feb). So I modified the time step and step size to 10 and 0.001 respectively. This allowed the file to run in febio (filename: exp2.feb). However, technically with these modified magnitudes, the time duration for the 2nd pressure loading should be 10 x 0.001 = 0.01. With that assumption, I further changed the curve editor value now to (0,0) to (0.01, -85.5) instead and tried to run it in febio again. However, the file ran into error termination again (filename: exp3.feb) with negative jacobians.
This has left me quite confused about what the relation is of the curve editor values wrt the time step/step sizes.
Exp1.feb (error)
Intial step: 1st pressure load of 4 Pa applied (0,4) – (1,4)
Step 1: 2nd pressure load (0,0) – (1,-85.5)
Steps/step size = 10/0.1
Exp2.feb (runs in febio)
Step 1: 2nd pressure load (0,0) – (1, -85.5)
Steps/step size = 10/0.001
Exp3.feb (error)
Step 1: 2nd pressure load (0,0) – (0.01,-85.5)
Steps/stepsize = 10/0.001
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