hello dears
i want to apply a 3 point bending test on a beam using abaqus , i've found this helpful video
https://www.youtube.com/watch?v=soYwaW54WRg
where the user applies a specified displacement on the mid of the beam using displacement boundary condition, i want to apply a specified force (not displacement) that starts from 0 to 50 KN gradually through 2 KN increments then unload this load gradually till reaching zero. i don't the loading rate per time, how can i do this to get a load vs displacement graph like the graph attached.
note: i'm doing this test on a concrete beam and i'm using CDP model to model concrete.
Hi,
The loading rate is very critical factor; therefore, you must follow the standard. if the loading rate is relatively small, i.e. quasi static loading, you do not need to simulate the test gradually as you stated, just apply the load from 0 to 50 kN directly. In case you need to monitor the sample stress and/or strain with different loading levels, you should apply the load gradually with a step of 2 kN but you need the time.
@nawras h. mostafa
yeah i have been changing time and yes it is indeed a critical factor, yes i really need to apply it gradually to verify what's in the paper and then do my own work on the model.
the problem that they didn't mention the rate at which load was applied! all they said is that the load increase was using 2 KN increments and then the maximum loading was left for 30 minutes then it was unloaded again.
do you have any suggestion on loading rate, noting that the load is nothing but a static load that was increased to get the deflection on each level.
The increment rate is not mentioned in the attached paper .... I suggest contacting the corresponding author to get the missing information. If this is not possible, you should try different time scales. let us say 2 kN every a minute.
rate is not a major affecting factor in this test, i tried practically by varying speed but result is almost same in each case.
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