Time -dependent distributed load on cantilever beam.

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Hi there,

I'm trying to re-modeling a time-dependent load cantilever beam as shown in fig.1. The result obtained from Scaled Boundary Finite Element is shown as fig.2.

I did defined the interpolation function as shown in fig.3 and 4. It looks identical with the original function. Then, I assigned Output times for time dependent study as shown in fig. 5. I've got the displacement vs. time as shown in fig. 6 but it didn't even closed to fig.2 at all.

My noticed, during time = 0.02-0.03, time variation is equal to -1, meaning load is acting downward so the displacement should be negative values. My displacement are all in positive values which I thought it wasn't make sense at all.

Please help and I really appreciate it.

Best regards, KM.



1 Reply Last Post 15 juil. 2024, 06:34 UTC−4
Henrik Sönnerlind COMSOL Employee

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Posted: 4 hours ago 15 juil. 2024, 06:34 UTC−4

In fig. 6, you are plotting the magnitude of the displacement, which is a quantity that by defintion is positive. It is the vector norm if the displacement. If you want signed results, you need to look at an individual displacement component.

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Henrik Sönnerlind
COMSOL
In fig. 6, you are plotting the magnitude of the displacement, which is a quantity that by defintion is positive. It is the vector norm if the displacement. If you want signed results, you need to look at an individual displacement component.

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