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Typos in DKT Element; function dHxdeta(ip) and B-Matrix #16

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awegger opened this issue Oct 22, 2023 · 1 comment
Open

Typos in DKT Element; function dHxdeta(ip) and B-Matrix #16

awegger opened this issue Oct 22, 2023 · 1 comment

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@awegger
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awegger commented Oct 22, 2023

Needs to be the following:
d9 = -2.0 + 6.0eta + r5(1.0-2.0eta)+xi(r4-r5)
(Apologies, I am a noob at Github, but I saw the error when comparing the results to the exact stiffness matrix formulation paper. With this small change both formulations give the same results for the stiffness matrix.)
@awegger awegger changed the title Typo in DKT Element; function dHxdeta(ip); d9 Typos in DKT Element; function dHxdeta(ip) and B-Matrix Oct 28, 2023
@awegger
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awegger commented Oct 28, 2023 •
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Another correction is necessary:
In B-Matrix: This line "-x31 * dHydeta(ip) - x12 * dHydeta(ip)" should read "-x31 * dHydxi(ip) - x12 *dHydeta(ip)"

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