Dear Abaqus users,
I’ve been trying to use loading (concentration force) in Abaqus Standard (to simplify: static general, linear model) to be different in each step in terms of the location (assigned loaded nodes). The task seems to be simple, yet I’ve been struggling with that.
To visualise the problem, please imagine you want to click Q, W, E, R keys on the keyboard - one by one with your finger (load). So you define 4 steps and 4 loads assigned to each step (i.e. Q,W,E,R). Each step starts at 0 and ends at 1. If you use Amplitude “RAMP” the force in translated to the beginning of subsequent step – so before W is clicked the force is already applied from step Q -> of course I don’t want it.
This is why I use Amplitude-tabular and define: rising and dropping of the force-in-time for the step (0-0, 0.5-1, 1-0) which is similar to a shape of triangular; set time span: Step time. I assigned the amplitude to each force in each step. I also remember in Load Manager to make it inactive in the next steps (just the current as I want). So it shall be working… not. The force is applied and realised in the 1st step (Q) as expected (so rising till time 0.5 than dropping to 0 at 1), yet dismissed in the next steps (so the W,E,R keys are not loaded). Why is so? Thank you for any hints!
Hi Mariusz Ptak,
You can use four amplitudes in the same step (from 0 to 4):
AQ=(0-0, 0.5-1, 1-0, 4-0), AW=(0-0, 1-0, 1.5-1, 2-0, 4-0),
AE=(0-0, 2-0, 2.5-1, 3-0, 4-0), AR=(0-0, 3-0, 3.5-1, 4-0).
Dear Mariusz,
just generate field output request for time equal 0.5 in every step and everything gonna be alright :)
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