Simple plain strain state does not produce expected deformation
Dear all, I am trying to simulate the scrolling of a thin, flat film/beam into a ring by using an uniaxial strain with a linear gradient. This is done in Comsol using a 2D structural mechanics model...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi Silvan, I would vary the thickness of your beam and see if the offset depends on it. If you find any constant ratio in that - this would be suspicious. Best regards, Sven
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi Sven, Many thanks for your reply. Indeed you're correct: For tBeam 3[um]-10[um] (range of intrest for me) the offset/tBase ratio is almost perfectly constant at 1.49 (1.498...1.494). In which way...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi, The most fundamental problem in your model is that when you are using geometric nonlinearity, the strains are measured as Green-Lagrange Strains. The initial strains must be interpreted as such, so...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hello Henrik, Thank you, this clarifies the issue a lot. However, I'm confused when it comes to eps0. The final radius still depends on eps0 if I either implement it as: solid.eil11 = (eps0-Y/R) +...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi, Your first expression ( (eps0-Y/R) + 1/2(eps0-Y/R)^2 ) is the correct one. Think of the physics the following way: 1. Curl up the structure to the intended radius 2. Now add eps0. Your circle will...
View ArticleSimple plain strain state does not produce expected deformation
Dear all, I am trying to simulate the scrolling of a thin, flat film/beam into a ring by using an uniaxial strain with a linear gradient. This is done in Comsol using a 2D structural mechanics model...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi Silvan, I would vary the thickness of your beam and see if the offset depends on it. If you find any constant ratio in that - this would be suspicious. Best regards, Sven
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi Sven, Many thanks for your reply. Indeed you're correct: For tBeam 3[um]-10[um] (range of intrest for me) the offset/tBase ratio is almost perfectly constant at 1.49 (1.498...1.494). In which way...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi, The most fundamental problem in your model is that when you are using geometric nonlinearity, the strains are measured as Green-Lagrange Strains. The initial strains must be interpreted as such, so...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hello Henrik, Thank you, this clarifies the issue a lot. However, I'm confused when it comes to eps0. The final radius still depends on eps0 if I either implement it as: solid.eil11 = (eps0-Y/R) +...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi, Your first expression ( (eps0-Y/R) + 1/2(eps0-Y/R)^2 ) is the correct one. Think of the physics the following way: 1. Curl up the structure to the intended radius 2. Now add eps0. Your circle will...
View ArticleSimple plain strain state does not produce expected deformation
Dear all, I am trying to simulate the scrolling of a thin, flat film/beam into a ring by using an uniaxial strain with a linear gradient. This is done in Comsol using a 2D structural mechanics model...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi Silvan, I would vary the thickness of your beam and see if the offset depends on it. If you find any constant ratio in that - this would be suspicious. Best regards, Sven
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi Sven, Many thanks for your reply. Indeed you're correct: For tBeam 3[um]-10[um] (range of intrest for me) the offset/tBase ratio is almost perfectly constant at 1.49 (1.498...1.494). In which way...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi, The most fundamental problem in your model is that when you are using geometric nonlinearity, the strains are measured as Green-Lagrange Strains. The initial strains must be interpreted as such, so...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hello Henrik, Thank you, this clarifies the issue a lot. However, I'm confused when it comes to eps0. The final radius still depends on eps0 if I either implement it as: solid.eil11 = (eps0-Y/R) +...
View ArticleRe: Simple plain strain state does not produce expected deformation
Hi, Your first expression ( (eps0-Y/R) + 1/2(eps0-Y/R)^2 ) is the correct one. Think of the physics the following way: 1. Curl up the structure to the intended radius 2. Now add eps0. Your circle will...
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